My Hero Academia / WMG

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Please put new entries at the bottom of their respective folders, and move Confirmed/Jossed theories to the Confirmed/Jossed folders.

Wild Mass Guessing is for theories about future developments, so all spoilers are unmarked.

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Her backstory will reveal that she was often picked on for looking like a frog and having a seemingly-useless quirk. Her motivation for signing up for Yuuei Academy was to prove that she wasn't useless.
- This would line up well with her insistence on her classmates referring to her by her first name. She views it as a sign of friendship and she just wants to have friends.
- This will give Deku more reason to sympathize with her, as he used to be bullied for being Quirkless, opening an option for romantic side story, to contrast the lighthearted humor and edgy fight against crime.
  - Mostly confirmed. While Tsuyu wasn't bullied, she did have a Friendless Background and her insistence on First-Name Basis comes from I Just Want to Have Friends.

There will be a Quirkless Hero

In contrast to the Quirkless Villain, he didn't have All Might to help him, but that didn't stop him from helping others. He'd be classified as a vigilante since he's Quirkless.

Confirmed. Knuckleduster, one of the protagonists of VIGILANTES, is Quirkless, although he used to be a pro hero with a Quirk.

Midoriya will make use of equipment as part of his permanent hero-gear

Will probably be jossed, but the idea of Izuku using a shield like Captain America may not be a crazy idea given how effectively he had used his makeshift shield in chapter 26. Besides, it could be helpfully useful until he fully masters his ability.
- Possibility of Midoriya getting equipment as part of his permanent hero-gear has increased given his partnership with Mei Hatsume in the sports festival. Chances are, she would be happy to lend him her inventions, including prototype equipment. Hey, she got someone to test the "babies" before selling them to corporation, and it's free at that!
- Possibility has grown further as Midoriya is now seeking a way to fight without being reliant on One For All in Chapter 44.
It's a possible stop-gap measure until he can fully use One For All since he's only got about 2-3 more uses of the arm until it's permanently damaged. He'll probably use some armor or mech-arm as support until he doesn't need it anymore.
Confirmed in chapter 101 to have added mech support for his arms and legs, onto his hero costume.

All Might is Secretly Dying

Because he transferred "One for All" to Midoriya. The way he and Recovery Girl reacted when they found out Midoriya could begin to see All Might's image in "One for All" and Torino's reaction in chapter 48 seem to hint that giving away "One For All" takes its toll.

Confirmed in a sense, Sir Nighteye's Quirk saw him dying in a year or two. As he's never been wrong before, All Might certainly believes this can happen.

Midoriya will eventually face a villain whose Quirk allows him to steal other people's Quirks

And it will be called "All For One" to match his "One For All".
- And one of the powers the villain will gain will be Venomous Chainsaw's, forcing Midoriya to face a villain who possesses the same power that nearly killed All Might.
  - Viz's official translation revealed that (according to All Might) that Venomous Chainsaw couldn't even get near him.
- Chapter 29 reveals that one student from class B has a Power Copying Quirk. It's not too hard to imagine someone else has a power stealing Quirk.
- "All for One" confirmed in Chapter 57, and not only was the user of "All for One" the one who wounded All Might, but he was also the one who killed All Might's predecessor.

There's an evil counterpart to One For All

It was already hinted at when Toshinori/All-Might realize that the Nomu had gained his Quirks from a Quirk that can grant others powers. It is no way in hell One For All, since he bequeathed that already to Deku, so it is the polar opposite of One For All, a quirk that grants power but, somehow, empowers the one using it. Furthermore, it would probably have been only one user since its inception, unlike One For All which is passed on and nurtured, this Quirk passes quirks all for the benefit of the Main Holder. And for the sake of theme, it would probably be "All For One," like what was said in the YMMV.

Confirmed. And this is NOT a good thing...

There is already someone with the ability to permanently steal quirks

This is based on the "All for One" WMG above. As stated in the series, quirks have limitations and it is possible that a person with the ability to permanently steal quirks from others could have already existed but could either only steal a limited number of quirks or must fulfill difficult conditions to be able to steal any quirk.
- Following the WMG above, it is possible that a "seemingly quirk-less" individual actually possess the ability to steal quirks but only realized about his/her ability after suffering much grief due to discrimination against people without quirks. If such a person discovers the nature of his/her quirk, then it would only be a matter of finding a way to overcome the limitations of the quirk (possibly via technology). This would lead to the "All for One" scenario of quirk-stealing.
- An alternative to the WMG is that "Venomous Chainsaw" is actually a person who somehow managed to steal two separate quirks, "Venom" and "Chainsaw", but cannot steal any more than that and is thus stuck with the two quirks. If that is true, it would not be surprising that the villain would be interested in going "All for One".
  - Jossed, they are unrelated.
- And probably that person is also the one that can grant quirk to other person, the same guy that give Nomu his regenerative and super strength quirks.
  - Confirmed.

All For One and All Might BOTH SURVIVE

But they will be in critical condition, forcing their students to step up their game.

Confirmed! All for One winds up in a heavily guarded police facility while All Might loses the last of his power. Shigaraki steps up as Big Bad, which was Sensei's intention all along.

The Shape Shifter girl from Shinketsu High is Himiko

The first hint was when Toga took Ochaco's blood during their battle, allowing her to take Ochaco's form. Second, she swiped Izuku's blood during their fight. Third, she makes a rather ominous comment towards Ochaco before she fled. Fourth, Izuku and Hanta both call her a pervert, something Himiko is known for being.

Confirmed in chapter 114.

There may be an anti-quirk faction in the series

Given how people are treated based on their quirks (or lack of quirks like Midoriya before he met All Might), it would not be surprising that there would be people who hate quirks in general due to past mistreatment/trauma. The faction does not even need to be composed of quirk-less individuals as people can be mistreated due to possessing the "wrong quirks" like Shinsou.
- Given Endeavor's past actions, it may be possible that Todoroki's elder sibling(s) would be members of such a faction if not a villain faction.
  - Or at least one of Todoroki's siblings since it would seem contrived that all three of his siblings just happen to be Quirkless. Possibly Fuyumi since she's the first one we've seen, and she wouldn't look like the type who'd be an antagonist. Alternatively, Todoroki's mother would be in the faction. She would denounce her Quirk because of all the pain it caused her family.
- Confirmed! The villain Overhaul sees Quirks as a disease, and sees his anti-Quirk bullets as being the cure.

There's going to be a School Festival episode.

Well, this is a manga that focuses on schools, it's practically a given at some point. Given that the Sports Tournament was a huge spectacle, the UA Cultural Festival is also probably some sort of national event. Classes get to use their quirks to make the exhibits more exciting (like in Gakuen Alice), and there'll be appropriate amounts of Ship Tease you'd expect from such an event (yukatas, fireworks, etc.). Not to mention this'll give the students in other courses a chance to shine as well.

Confirmed, the class begins to prepare for the UA Cultural Festival in chapter 169. While it's mentioned to be smaller in scale than in previous years, the other departments are in charge of it.

There will be a character with a tragic childhood directly linked to their power awakening.

If a child has a Quirk, it will manifest by age 4. Now, imagine a power like Shigaraki's or No. 13's awakening before the child's very eyes or in front of their family. The results would not be pretty, especially if they were never given Quirk counseling.

Possibly confirmed with Shigaraki in Chapter 69.
- Chapters 235-237 confirm this with Shigaraki. Holy moly...
Implied to be the case with Eri in Chapter 156 where it's heavily implied she made her own father disappear with her power. Said childhood only got worse from there because she wound up in the Hassaikai's custody because of it.

Aizawa will adopt Eri, or at least act as a sort of guardian.

His Quirk is the only thing shown that can keep her Quirk in line if it ever goes out of control. Having him around her in some official capacity will allow her to keep interacting with Midoriya and the rest of the U.A. crew, and she could act as a more direct Morality Pet for him.

Confirmed in Chapter 184. Aizawa doesn't legally adopt Eri, but due to the dangerous nature of her quirk Eri is now under UA's custody instead of being passed off to foster care. Aizawa will be looking after her with the help of Mirio.

One For All has other powers aside from Super Strength and Nigh-Invulnerability

While the most obvious advantage of being empowered by One For All is Super Strength and being invincible, it was a receptacle for All For One's other powers. Maybe there are residual powers there that All Might hasn't unlocked yet, or that will be unlocked further by Deku.
- Based on the nature of One For All as the original wielder's latent power-transferring quirk combined with a strengthening quirk that his brother forced on him, logically it should continue to merge itself with any other quirks that its wielders have. While All Might and Deku were born Quirkless, Nana Shimura was not (though her original quirk has yet to be revealed) and we know nothing about what quirks the previous 5 inheritors had. So there's up to six other quirks that could've been absorbed into One For All beyond the original body enhancement and transferability aspects.
- Confirmed. Izuku has recently manifested 'Black Whip', one of the previous users' quirks. Said user has also told Izuku that he will receive all six of One for All's stored quirks.

One For All absorbed the Quirks of everyone else that possessed it.

We know that All-Might and Izuku, at the very least, were Quirkless when they obtained One For All. We're not sure about Nana Shimura, or any of the other One For All bearers up until AFO's brother (who had a Quirk that could be transferred)— they could have had Quirks, and since OFA is a mutation of two different Quirks joining together, it's possible more could have gotten mixed in. This would explain some Quirk-like abilities that All-Might and Izuku have, such as All-Might's muscle form and Izuku's ridiculous pain tolerance.
- Confirmed. One for All has absorbed all six of the previous wielders' Quirks, and Izuku has already manifested one- Black Whip.

Dabi's real name is Toya Todoroki

Incredibly powerful fire Quirk, burn scars, seems to be narratively linked to Mighty Endeavor and Shoto, we don't know where Toya is... It would fit.

Going off of this, Toya was said to have a powerful fire Quirk, but a weak constitution, hence why he wasn't Endeavor's successor. Dabi's quirk produces blue flames, similarly how Endeavor pushes his Hellflame to his limits when fighting the Hosu Nomu. So then wouldn't it make sense for the burnt skin to be part of his "weak constitution"? Not to mention Toya left after a "particular accident". Would make sense for after that accident, for Toya to start hating Endeavor and become a villain to spite him.
- As of Chapter 290, confirmed - Dabi is Toya and his turn to villainy was a direct response to Endeavor's abuse.
It also fits his name, "Dabi." That translates to "Cremation." It's possible that his old self died and was metaphorically cremated. His whole motif also fits bandages, like some undead mummy surviving and holding a grudge.

Dabi is one of Todoroki's older brothers.

Chapter 74 confirms that he has a flame Quirk, and a rather powerful one at that. This would explain why he refuses to give his real name to Shigaraki, as he wouldn't want to be identified as a member of the Todoroki family. Knowing what sort of person Endeavor really is while growing up watching him be lauded as a great hero would also contribute heavily to his determination to follow Stain's ideals of punishing fake heroes.

The only thing going against this theory is that in the flashback with Shoto's siblings, none of them had completely dark hair. However, one of his brothers (the one whose face the reader didn't see) does have a haircut similar to Dabi's, so it's possible that he dyed it.
- Adding to the theory is that at the end of Chapter 81, Todoroki's expression looks surprised when he and the others appear in front of Dabi.
- In chapter 192, it's stated that something 'happened' to Touya Todoroki (who is the above mentioned sibling with a similar hairstyle).
  - In chapter 202, Endeavor mentions in a flashback that he originally intended Touya to be his successor despite his lacking a combination of fire and ice like Shoto's, because Touya's fire was even stronger than Endeavor's own Hellflame. But Toya inherited his mother's "weak constitution" and thus was discarded as a failure. Which fits well with Dabi, who has a very powerful fire quirk (with blue flame, which in real life burns hotter than red or orange) but admits during the Training Camp arc to being physically weak. And his databook stats include 4/5 for power (surprisingly low given how strong his quirk is, which can only be explained by his weak body). By comparison both Endeavor and Shoto have 5/5 for power, reflecting that they have both strong quirks and strong bodies.
Dabi is also colored with blue eyes, which in the anime are a similar shade to the eye on Todoroki's fire side. Inherited from Endeavor, perhaps?
Touya has his father's red hair in the anime, so maybe he dyed it black because it reminded him of his abusive dad?
- Confirmed, Dabi IS Endeavor's son, as of Chapter 290. And he did dye it black!

Endeavor’s abusive past will be exposed to the public.

This most recent arc seems to be pushing a redemption for Endeavor, but it also seems to heavily hint that the moment he’ll start to actively do so, his past abuse of his wife and family will come to light, thus staining his reputation and causing a fall from grace in the public’s eyes. This will, in turn, further contribute to the deteriorating trust the public has for heroes initially brought about by Stain.

Confirmed as of 290 - Dabi has revealed Endeavor’s abuses to Japan. The repercussions are yet to be seen as of this posting.

The same mastermind is behind both Starservant and Ending

The man whose quirk allowed him to control glass was said by witnesses to have been just a crazy bum until his attack; from his eyes and bleeding nose, he looked like he was jacked on the Trigger drug, and his crazy talk when arrested seemed directed at Endeavor specifically. Later on, the villain known as Ending clearly injects himself with the drug before taking Todoroki's older brother hostage. It's too easy to think those attacks are not unrelated and that someone is playing games with Endeavor through the use of some poor saps not in their right minds (Ending wanted to be killed by Endeavor). The prime suspect would be Dabi but it could be anyone else; after all, it'd be in the best interest of the PLF to gradually undermine the society of heroes by eroding its current pinnacle.

Confirmed in Chapter 290. Dabi claims responsibility for sending Starservant and Ending after Endeavor.

A huge prison break of villains will happen

After his power-up, even Shigaraki on his own may easily breach the Tartarus, and any other prison for that matter, to free the inmates, up to All For One.

Confirmed in Chapter 297, thanks to Shigaraki's upgrades and his Near-High Ends, All For One, Muscular, Moonfish, and some other villains make their escape.

Jossed

All-Might will formally announce his retirement at the conclusion of the U.A. Sports Festival

We already know that All-Might's power is declining to a degree he can only keep it up for an hour or less now. Following Midoriya's witnessing of the One For All phantoms (and that All-Might was apparently among them) All-Might may be forced to acknowledge he can't keep it up anymore. However, these games are an ideal chance to make that known without destroying the calm gained by his status as a Symbol of Peace. He could announce his retirement, citing issues from the fight the actually caused it, but go on to declare that just because he won't be a hero any longer, the future will be in good hands with the next generation and the fine showing they've made already.

Partially Jossed in Chapter 44. He would not be retiring but he does have faith in the students.
- Completely Jossed, he retired after his battle with All For One, on live television, and he used the last of One For All.

Todoroki will end up using his flame powers against Midoriya

And lose because he's not used to using them in an actual fight.

Partially Jossed, Midoriya lost, and Todoroki used his flame.

Iida will become an Anti-Hero

Chapter 46 foreshadows that something will happen to Iida that Izuku will greatly regret. It's possible that he will kill Stain in order to avenge his brother.

Jossed. Iida got straightened out after his experience with Stain.

Iida will be turned into something like Nomu

After seeing how outmatched he is against Stain Iida will be approached by Nomu's creator and be offered the chance to become stronger and he, driven by his desire for vengeance, will accept.

Jossed. Iida is staying a hero.

The Villain at the end of Chapter 41 is Venomous Chainsaw

It was inevitable that he makes an appearance.

Jossed.

Shigaraki's backstory is a Bait the Dog moment

Chapter 69 reveals that Shigaraki may have killed his parents when he awakened his Quirk for the first time and then goes on about how All Might can't save everybody. He didn't resent All-Might because he failed to save his parents. He killed his parents to prove that he couldn't.

Judging by Chapter 88, this is Jossed.

All-Might's possible death

People have been theorizing that All-Might will die in his battle against All For One. What may happen is that as the battle progresses, All-Might regresses to his weakened state. With no other witnesses, Endeavor uses the opportunity to give All-Might a "Long Live the King"-style betrayal by allowing AFO to finish him off in exchange for letting him get away with his crimes (of course, knowing Endeavor, he wouldn't uphold that end of the deal anyway).

Jossed; he survives the battle with AFO.

Himiko Toga is Quirkless

As of right now Toga's never seen using a quirk. Her assignment for the invasion was to get the blood of 3 people, but she uses a machine to do that. And in all her confrontations she uses a box cutter or a syringe to cut or stab her opponents.

Jossed, her quirk is revealed in chapter 115, as Human Shifting/Shapeshifting via another person's blood.

It's possible that Toga was like Deku and wasn't born with a quirk. So, she makes up for that with crazy reflexes, crazy speed, and just being crazy. It's also why Toga had the most equipment out of the villains we see during the arc. Unlike the others, she doesn't have a quirk to rely on and so was assigned to just gather blood, for whatever reason, instead of joining the attack.

Jossed. Her backstory shows that she always had her quirk.

Ragdoll...

Is either The Mole or has been made into a Nomu.

To add to this, she may be forced to give out the location and weaknesses of everyone present to Dabi and the other villains. That is how they found Aizawa-sensei and Bakugo so fast. Her quirk provides her with such information and if she were able to participate in the battle the heroes and students would have had more of an edge. After she gave them the info, Dabi used the Nomu to nearly kill her. However, since her quirk would be incredibly useful on either the villain side or just on a Nomu, Kurogiri chose to take her half-alive when he came to take the villains away.
Jossed in Chapter 87, she's narrowly avoided the second scenario thanks to the Big Damn Heroes.

Bakugo and Todoroki are brothers.

Right now, they foil each other with an unhealthy need to be the number #1 hero. Since Katsuki seems unaware of who Shoto is in chapter 11, calling him "ice guy" and distressing "I thought he was nothing before!" and they don't share last names, this would work along the lines of the earlier WMG where they'd have different mothers, before Endeavor found Shoto to be his perfect successor. Endeavor's power deals with fire, and Katsuki's explosions, which could easily be related.

Katsuki's stunned face after overhearing Shoto's conversation with Izuku about his past, in this case, would have as much to do with realizing they share the same father as trying to take in the horribleness of said past. And if Endeavor cares as little for Shoto's brothers as he implies to Shoto soon thereafter, then Katsuki may have been one of the sons who'd had to deal with being ignored or the like, which could explain his desperate hatred for those he perceives not as powerful as him "looking down on him" (since not only does he have his quirk, of all people he'd be Endeavor's—unacknowledged—son), as well as his stubborn insistence to be #1 all the time ahead of everyone (for the goal of both possibly being acknowledged and surpassing Endeavor).

With chapter 39, Shoto's mother saying that "The children...they're more and more like him" could lend to this theory since Katsuki was a self-centric bully as a child, and both Shoto and he have "fire"-like basis to their quirks. When young Shoto looks outside to a group of children playing, with the implication that they're his siblings, the one in the middle has spiky hair like Katsuki's, though his face is hidden.
From the same chapter, a main flaw to the theory is said possible siblings being nearby. If they really are his siblings, and they all live in the same household, it'd be strange for Shoto and Katsuki not to know each other's names and so on, as seen in earlier chapters, unless they were kept that isolated from each other.
- Jossed three ways to Sunday. Todoroki was not isolated enough from his older siblings that he doesn't know their names. We meet his older sister in the manga. Also, Bakugo doesn't possess Endeavor's eye and hair colors, which are somehow also passed down to the offspring that received such abilities. And we've met Bakugo's father.
A simple modification to this theory would be that Bakugo's dad is Endeavor's BROTHER instead making them cousins, yet the last name thing is a serious blow to even that theory (unless Bakugo's dad changed his last name somewhere along the lines) and Endeavor never even interacting with Bakugo's mom. All and all, it is impossible the two are related in any shape or form, they look nothing like each other.

If the series gets a 12-Episode Anime, it'll end with the Stain Arc

It seems like a logical point to end the season.

Jossed. The anime started with 13 episodes in its first cour, and it ended with the Unforeseen Simulation Joint arc.

The anime will Bowdlerize Shoto's backstory

Anime based on Shonen manga would sometimes have their darker aspects altered in some form (much like Orihime's Abusive Parents getting rewritten as Parental Abandonment). I think in the anime, they'll change what caused Shoto's scar. Instead of his mother pouring hot water on his face, it'll be rewritten as her confronting Endeavor for his abusive methods, she throws boiling water at him, but Shoto gets caught in the crossfire.

Jossed. While not explicitly animated (at least not yet), Shoto narrated the incident as it happened in the manga.

Stain was deformed because of a hero's incompetence.

During a villain attack, he got badly burned in the crossfire. The hero in the area focused more on chasing the villain rather than tending to Stain, which led to his disdain for heroes. His respect for All Might came from him being the only one who showed the slightest bit of concern for him.

Jossed. His disdain for 'Fake Heroes' happened because he thought the occupation was suffering from "Fundamental Decay" and weren't acting like heroes anymore in his eyes. He tried to become a hero because he admired All Might, but the two never met. We haven't got any indication as to what caused his deformity... but he's screwed up enough in the head that it might be self-inflicted.
Maybe one of Stains' victims managed to disfigure him before they died?
If the Illegals spinoff is anything to go by, Stain may have been disfigured during a scuffle with the titular Vigilantes, or else as punishment by Quinn Hachi.
- His nose was broken by Knuckleduster who mocked Stendhal for his lack of resolve. So as a testament of his resolve, Stendhal cut off his nose and discarded the name, becoming Stain instead.

Bakugo will lose his Quirk by the end of the next arc

Unless somebody pulls a rabbit out of their hat, Bakugo got taken by the League of Villains. Despite Bakugo's arrogance, he hates taking orders and values heroism too much to become evil unless All For One decides to torture him. Instead, AFO will take Bakugo's Quirk and give it to a Nomu. Because All Might has already passed on One For All to Izuku, he won't be able to do the same for Bakugo, causing him to get expelled from U.A. Academy. Tying into the Quirkless Hero above, this will lead to Bakugo learning some humility and become a Quirkless vigilante.

He knows that Deku was given a Quirk. That would naturally aggravate him if he were to lose his.
Jossed, Bakugo still has his Quirk after meeting All For One, and is learning some humility without having to lose it.

Midoriya will become a fugitive

With the reveal of Himiko Toga's quirk as well as having a sample of Midoriya's blood, she will use his likeness and commit crime sprees, framing him and forcing him on the run.

At the moment, Jossed. She used what little blood she had from him to turn into him and lead the Ryuku team into helping Midoriya, Mirio, and Night Eye against Overhaul, the implication being she used all of it so the Villain Alliance could get Revenge on Overhaul.

Eri will use the Quirk-erasing drug on herself.

To not only save Midoriya from her power, but also to make sure no more of the drug can ever be created.

This will also stop it from becoming a Story-Breaker Power.
- At the moment, Jossed. After defeating Overhaul, her quirk started to Overload and put her in a mini coma. She did wake up, but they're keeping an eye on her for testing and have noticed her horn seems to be shrinking. So, no, she isn't getting rid of her quirk.

Endeavor planned on killing All Might

Because when he said he wanted an heir that could beat All Might, he literally meant it. He would either brainwash Shoto or frame him. He would then get Shoto arrested. With All Might dead and his alleged killer brought to justice, he would become the Number 1 Hero.

Jossed.

Koji Koda never speaks because his Quirk works on humans as well.

Koji Koda's Quirk is Animal Voice, which allows him to communicate with and command animals— we see him use it on bugs (reluctantly) in the End of Term Exam arc, and on Birds in the Hero License Arc. But, as we've seen, Quirks can be somewhat indiscriminate with their targeting— Kaminari can't control which direction his discharge goes in, for instance. In addition, some Quirks don't have an off switch, such as Tsuyu's Frog form. There's no indication that Koda's Quirk can be turned off, so maybe the reason he never speaks is because he might accidentally command people to do something that would hurt them.

Jossed, the anime confirms that it doesn't work on humans.

Overhaul never used his Quirk during his first meeting with Shigaraki.

It was a sniper who works for him who shot Big Sis Mag and Mr. Compress: It carries absurd power but can only hit little beacons. Overhaul carries a bunch of them and places them where he wants the sniper to shoot, which is what he did with Big Sis Mag's arm, and the sniper threw the beacon at Mr. Compress directly. Overhaul's arm-swinging motion is merely a signal to shoot.

This is probably not true though, as it's looking increasingly likely that Overhaul's ridiculous power is the real deal. But it might not be that strong a Quirk—like with Mirio, he may be using a standard Quirk in an unconventional way to make it appear much stronger than it actually is.

Jossed. The shot to Compress's arm was a nullifier bullet to keep him from using his quirk on Overhaul. Overhaul's quirk is what destroyed Mr. Compress's arm.

Gentle Criminal is Aoyama's Father.

Obsession with appearance? Similar facial structure? Gifted in stealth(Aoyama sneaking onto Deku's balcony to leave him a message)? Appreciation for classy snack foods? Both concerned about their popularity? Both with a love of theatrics? Somewhat under-powered compared to their peers? Desperate for attention? They're too similar NOT to be related to each other in some manner. It's also a bit telling that Aoyama had a short character study just before Gentle showed up. Almost as if Horikoshi wanted to keep Aoyama fresh in the readers' minds as we were introduced to Gentle and La Brava!
- Jossed, Gentle, being 34, is way too young to be Aoyama's father.

Inasa's father is the Number 3 Hero

His father was also friends (and possibly even lovers) with Shoto's mother, so it was possible that he found out about Endeavor's ulterior motives. He harbored resentment for Endeavor not only because of what he did to Shoto's mother, but the fact that somebody as vile as him managed to out-rank him as a Hero.

Nope, Hawks is way too young to be Inasa's father, and he's also an Endeavor fan.

U.A. Academy Sports Festival Tournament Predictions

Midoriya is only pretending to be affected by Shinso's quirk. After being warned not to screw with him, he decided to fake getting caught in his spell to catch him off guard.
- Jossed, Midoriya was affected but he was able to free himself from the Quirk.
During Uraraka's fight with Bakugo, it'll turn out that Bakugo is against hitting women, which makes the battle difficult for him.
- Jossed in Chapter 35 and 36, Bakugo only held back because he was being cautious against her as his opponent and with good reason too.
If Midoriya makes it to the final round against Bakugo, he will avenge Uraraka. Todoroki makes it, Bakugo will beat him, prompting Endeavor to seek Bakugo out like in the above theory.
- Jossed. He doesn't make it to the final round.
Bakugo will talk his way to victory. He will talk Todoroki into rebelling against Endeavor. In his first act of rebellion, Todoroki will forfeit because he knows it would really piss him off.
- Jossed. It's reversed, Bakugo ends up thoroughly pissed off that Todoroki refused to fight him with full power, and he ends up with an unwanted easy victory.

Masaru Bakugo is Endeavor's brother

When you look at him, he has a similar haircut, and unless a color page proves otherwise, the same shade, as well as having a fire-based Quirk. After finding out about the lengths Endeavor went through to usurp All-Might, he estranged himself from the Todoroki family and took Mitsuki's surname when he got married.

Jossed as of episode 50 of the anime, Masaru has a different hair color then Endeavor.

Was not a "Single" moment where All Might could have Helped Shigaraki that made him despise All Might and want to become a villain

There were in fact several incidents where All Might was in fact able to help Shigaraki or his family but for some reason or another All Might did not help. Adding on to this, despite his quirk Tomura originally wanted to be a hero but All Might's failure to aid him caused him to come to hate heroism. Sensei just gave him some guidance but Shigaraki's hatred was already there when Sensei found him.

Jossed. We get to see the exact moment Tomura needed a hero the most, and it is perhaps the one moment most pivotal in his turn to villainy.

Shigaraki doesn’t know Nana Shimura is his grandmother

Jossed as of the Meta Liberation Army arc. Shigaraki has regained his memories of his childhood as Tenko Shimura, and learned from his sister what their grandmother looked like and that she was a hero. It's probable, however, that he doesn't know the full significance of his relation to her or that she was a user of One For All (if All For One ever even told him about the quirk).

Tenko Shimura/Tomura Shigaraki didn't kill his family. All for One did.

The story All for One fed Shigaraki about the death of his family (specifically that Tomura disintegrated them by accident) seems to have a lot of holes in it. First, by his own admission, Tomura doesn't remember much of what happened. This could be chalked up to trauma-induced amnesia, but there's other factors. Why would he disintegrate his family and leave just their hands? Why would he have continued to disintegrate them after he either started to or completely disintegrated one of them? If Shigaraki had been living on the streets after what happened, how did All for One know where to find him? And then that's that whole thing about how Tomura's quirk was "previously unheard of".

All for One has spent a good chunk of his existence making the lives of the users of One for All harder, and killing Nana's family, kidnapping her grandson, then warping the child to hate her successor is right up his alley. He either killed the family himself and altered Tomura's memories to his needs, or gave the quirk to an unsuspecting Tomura to unleash when the time was right.

Eventually, probably near the end of the series, this will be revealed, and Tomura - thrown into a Villainous Breakdown upon learning that his beloved sensei is the reason he is the way he is and still in possession of the quirk erasing bullets he stole from Overhaul - will turn on All for One, Calling the Old Man Out, shooting him with the quirk erasing bullets, and disintegrating him.

Jossed. We get to see a flashback of Tomura killing his family in gruesome detail.

All For One can't really hear his brother's voice.

All For One is actually crazy and well... hears voices. Because he's crazy and has an enormous amount of quircks he thinks he stole one which makes him able to hear his brother's voice, which is not the case.

Possibly Jossed. We know that both AFO and OFA house the spirits of those whose Quirks have been stolen or passed on respectively, so it is possible AFO was hearing his brother’s spirit.

The traitor was among the group that fought Gigantomachia, and their interference resulted in the plan to take him down failing

At the end of Chapter 280, Kirishima had successfully administered Yaoyorozu's sedative to Gigantomachia, and while Gigantomachia responded by putting his armor plating over his eyes, the heroes still appeared to have a chance of winning. The next time Gigantomachia is seen is at the end of Chapter 282, after Iida, Uraraka and Tsuyu learn that Gigantomachia broke through the heroes and is going to rampage through anything in his path. It's possible that the reason we didn't see the heroes' defeat is because the traitor did something to interfere at a crucial moment, causing them to lose.

I say this is Jossed since the sedative FINALLY takes effect in Chapter 293. Even the strongest sedatives don't work right away. Depending on what you're applying the sedative to, how you're applying it, and how big the dose is, all contribute to how long the sedative will take effect and how long it'll hold.

Arcs theories

The next story arc will be centered on Bakugo

The Sports Festival arc centered on Todoroki, and the Stain arc centered on Iida. In the next arc, Bakugo will get his fair share of Character Development.

The Summer Training arc leads into the Hideout Raid arc, which is centered on Bakugo.

EVERYONE in 1-A will have their own sub-plot.

So, this series has many, many characters. And pretty much ALL OF THEM, including the villains, are beloved by the fandom. The author himself admits that he is frustrated to not be able to present them correctly or give them proper attention.Moreover, while Midoriya and Bakugo stay the main characters, BNHA is notable for shifting focus from one character to the others for the secondary ones. Several secondary characters already had more focus put on them. But doing it with all of the staff would be a great way to flesh them out and even give all of them their own sub-plot or at least A Day in the Limelight, especially with how the Provisional Pro-Hero License Arc ended. Including some students from 1-B and the villains.These subplots will be about why they want to be a hero and their trials to overcome the obstacles on this road (X : their origins), personal issues, or just their everyday life before getting into UA (like for Asui) with a bit of romance thrown in the mix.Potential sub-plots for the characters could be:

All Might: Adjusting to his depowered self and his status as a teacher and Midoriya's mentor.
Yuuga Aoyama: Overcoming his narcissistic personality/ any lingering insecurities about his weaknesses at least somewhat to befriend other classmates both inside and outside 1-A, and learning other ways to control his Navel Laser and supplement his belt.
- Partly confirmed: He does get a subplot during the Remedial arc, where he befriends Midoriya through their similar struggles with balancing their powerful Quirks and their weaker body limits.
Toru Hagakure: Begins doubting herself when she realizes how often her friends have to fight for their lives while she never contributes.
Mezo Shoji: Revealing the reasons behind his mask (his full face will be shown) and his frugal lifestyle, which seem to point to a troubled past, and coming out better from opening to his classmates.
Eijiro Kirishima: Developing his relationship with Bakugo, thus helping the latter to take a level in kindness.
Tsuyu Asui: More froglike techniques?
Minoru Mineta: Learning to be cool/ a kinder and more respectful character, especially towards female characters?
Denki Kaminari: Learning efficient ways to use his quirk without hurting his allies (done), learning to keep calm in dire situations and think more before acting, and improve his wattage limit (or finding a way to limit its side effect)?
Kyoka Jiro: Overcoming her implied confidence issues, improving her sound and finding new sound-based techniques (using electric instruments?), learning more fighting techniques (hand to hand or with a weapon)?
Momo Yaoyorozu: Fully growing past her Heroic Self-Deprecation to grow into the AWESOME hero she could be.
Fumikage Tokoyami: Finding a way to control Shadow even at night and developing more techniques with it. Also possibly something to do with Hawks, who is currently spying on the League of Villains for the government and has taken Tokoyami under his wing.
Hanta Sero:
Mina Ashido: Reveals that she used to be bullied all the time for her appearance and seemingly villainous Quirk. Her happy-go-lucky nature is just a disguise and she is similar to Izuku when not "in character".
Mashirao Ojiro: Developing further techniques involving his tail, overcoming his confidence issues rooted in taking issue with being considered "normal".
Koji Koda: Overcoming his EXTREME shyness.
Rikido Sato:
School faculty and staff: Finding out who the traitor in U.A. is, and continue protecting and forming the present and future students.
Tomura Shigaraki: finding more allies and becoming a true Big Bad worthy of AFO.

Bakugo and Amajiki will fight side by side against a Main Antagonist from some major arc future.

Many consider that Izuku, Bakugo, and Shoto what U.A.'s next Big Three. and since Izuku and Shoto have already interacted and fought side by side along with a member of The Big Three against some antagonist in a long and important arc (Izuku along with Mirio against Chisaki during the Shie Hassaikai Arc and Shoto along with Nejire against Shigaraki in Paranormal Liberation War Arc), it is suspected that Bakugo and Amajiki will interact and fight side by side against some major antagonist in a major long arc of the manga.

Characters theories

Endeavor is a Villain with Good Publicity

Behind the scenes, he's an abusive father that only cares about the glory of being a hero. The burn mark on Shoto's face was caused by him and told people it was just part of his Quirk.

Alternatively, while he does mistreat his son, he does technically believe in being a hero, but has a very elitist, dark interpretation of what being a hero means. This led him to put Todoroki through Training from Hell many would consider child abuse.
Alternatively, he might really be a stern but still loving father whom his son misunderstands and resents. May have something to do with his yet-to-be-seen mother.
- While he isn't shown to be physically abusive (yet), Chapter 29 reveals that he's condescending enough towards Shoto.
Jossed, turns out to really be a case of Abusive Parents, including Todoroki's own mother who is the true responsible for his burn scar. While not exactly villainous, Endeavor seems to be very egotistical and has a screwed-up sense of competition, making him very similar to Bakugo. That is not even counting the fact that Todoroki is the fourth of Endeavour's attempts to produce super-powered offspring as stated in chapter 34.

The reason Toru is always invisible

It's because she is (or at least considers herself) unattractive, so she deliberately stays invisible out of insecurity. Being invisible helps her self-confidence, which is why she's a Shameless Fanservice Girl.

Support for this theory: She once described her face as looking like "if Yang Guifi and Francis Xavier were mashed together". It's Played for Laughs but when you really think about it, that...isn't a very flattering description of herself. That said, she may have simply been trolling the girls. Or maybe it's some mixture of the two.

Toru Hagakure is actually Beautiful All Along.

If her Quirk kicked in during childhood, before she had a chance to grow into her features, she might consider herself unattractive, almost to the point of a complex. She can't look in a mirror, but she does apparently take care of herself and can't suffer sun damage. If she learns to become visible, or is rendered such, someone will remark on how cute she is.

Todoroki will become Midoriya's rival and Bakugo will run off to become a villain.

It's becoming clear that Midoriya's true rival is Todoroki, who seems to have a better grasp on what it means to be a hero and a more honorable way of doing things, especially since his rivalry with Midoriya will likely reflect his father's rivalry with All Might. Bakugo, being rather hateful and insensitive, will eventually become fed up with being third best and get recruited by the villains.
- Given the fact that the manga is partly inspired by Naruto, Midoriya to try knocking some sense into Bakugo when he does become a villain (hopefully not to the same degree of insane easy forgiveness as Naruto)
- To extend that WMG, it is possible that Bakugo may end up trying to gain more power through gaining more quirks (namely going "All For One"). Chances are, a mad scientist of a villain will use Bakugo as a test subject (with or without informed consent) for the said ability to absorb quirks from others.
- I actually just thought of how the straw to break the camel's back could be Bakugo getting demoted to a lower-ranked class or different department, likely due to his inability to control his rage and his subsequent ridiculously unheroic behavior.
- Alternatively, Endeavor will give up on trying to make Shoto his successor. After seeing Bakugo declare his desire to be number 1 and using his powers, he will try to manipulate him into becoming his heir.
- Given the events of chapter 34, it may get Jossed due to Todoroki's hatred towards his father, Endeavor, which may drive him into becoming a villain just to spite him (given his reaction after just a short conversation with his father, it is certainly not impossible). On the other hand, Bakugo is not exactly the most heroic individual either as some of the professional heroes realized in Chapter 36.
- Though lately Bakugo has shown some character development (the Jerkass past still persist though), being a little bit more analytical and respectful ever since his Break the Haughty moment. Todoroki on the other hand, will be more open and heroic. Kacchan will probably stay as The Rival or The Lancer, while Shoto will become the Hero of Another Story.
- Definitely Jossed considering Bakugo was given an invitation to join the VA while held hostage at their base, and he told them no way point blank. Even though he is a jerk, he really admires All Might and his heroics and that was all the motivation he needed.
- This is only the first year, it isn't jossed till the story's done. Bakugo becoming a villain is unlikely, but it isn't jossed yet, who knows what might happen down the road.

The Arch-Nemesis for the characters

Midoriya: Either Venomous Chainsaw or Bakugo if he becomes a villain.
- Things seem to be leaning towards Shigaraki.
Iida: Stain.
- Spinner, Stain's Fanboy is another strong possibility. During the Summer training camp, he shows particular interest in Iida, calling him the one who "ushered in Stain's demise" and may try to kill him out of revenge and his intense dedication towards Stain.
Uraraka: Shigaraki.
- Himiko may become this for her.
Todoroki: Endeavor if he gets outed as a villain.
- Alternatively: Dabi may be more appropriate. So far, the only thing tying them together is a fire quirk, however in Chapter 82 the way the panels are drawn and the way they look at each other is too notable to be merely for dramatic tension. At least for a Shonen manga with tons of characters.
  - The Paranormal War Arc seems confirm Dabi as one for Shoto, given The Reveal that he's actually Shoto's oldest brother.
Tsuyu and Mineta: The Shark Villain that Tsuyu fought during the invasion.
- Tsuyu might share Himiko with Ochaco. As for Mineta, Twice could work for him since they're both the resident clowns of their respective groups.
Bakugo: All For One. If he ever busts out of prison, by a twist of fate, Bakugo will be the one to finish him off for permanently crippling All-Might.

Everything About Inasa

Aizawa claims that Inasa was ranked the best of the Recommended Students as they also had to take a separate exam from normal applicants. This makes him stronger than both Yaoyorozu and Todoroki. Because of how supposedly strong he is and the small hype we're getting about him, there's a high chance that he'll be the reason why at least one or two of Class 1-A won't pass the exam.
The way Todoroki looks at Inasa when he first appeared suggests that he's very familiar with him, or at the least remembers him and not in a good way. Some speculate that they went to the same middle school, but if that was the case than Inasa would most likely have said something about it. The most likely case is that Todoroki remembers him from the recommended student's exam, mostly for kicking his ass. If the above is true, then Todoroki is the only one familiar with Inasa's quirk and knows it through first-hand experience. These very small implications pretty much set-up Inasa as Todoroki's rival in the License Exam arc.
According to some translators, one way to write Inasa's full name includes the characters for "storm." Going by Horikoshi's history of naming, this implies that Inasa's quirk has something to do with controlling weather like components. This troper is going to guess that he can create storms from his body, so he can do things like produce large amounts of wind and lightning. Both could very well beat both of Todoroki's abilities.
- However, going by the fact that Quirks tend to balance, so that use too much you will strain it/ get hurt, what would his weakness be? Would he have Required Secondary Powers of immunity to electricity, or being able to breath in high wind?
  - Chapter 104 reveals that he has a wind-based Quirk.
  - Well, he's the reason Todoroki didn't pass the exam.

Aoyama is Quirkless

It's not my idea, but someone said it and actually makes sense. It kind of explains his superiority/inferiority complex, (seen in chapter 108) with him wishing to be "equal with everyone" and a tiny flashback of him with his belly belt supposedly from a new package? And it would make the whole "you are just like us" Iida moment a lot more significant. If they make him a subplot I would like them explore this more

Supported by the fact that Aoyama has yet to use his Quirk without his belt on. If anything, his "quirk" is just a beam from his belt, rather than the person.
More fuel to the fire is the very name of his supposed Quirk: "Navel Laser". Now, how big is a navel again? (Hint: Lift up your shirt and check for the answer) Considering if this is to be taken literally, even if he isn't Quirkless, the Quirk itself would be pretty much worthless without that belt, as not only would the laser be really, frigging small and thin, it might not even have the same range as it supposedly does with the belt on. Also, there might be inconsistencies with the assumed "drawbacks" as well. We know it is supposed to be "stomach ache/cramps" from repeated use...however, a navel isn't connected to the stomach, it's not connected to anything really, it's just a bump in the skin, a scar from an umbilical cord. Why would he get stomach pains from something connected to his navel alone? It doesn't make sense, unless...the pains are actually coming from overheating the belt too much, essentially boiling his innards with repeated usage. Regardless, the signs of his quirk being an actual quirk are alarmingly low...even more so considering that we don't know what his parents' quirks are either.
If Aoyama is to be believed, it's a bit more complicated than that. He never uses his Navel Laser without the belt because doing so is dangerous. Like Deku was initially with One for All, Aoyama was born with a Quirk he couldn't control, doctors even noting it tended to leak out, and could cause him stomach pain. The Belt is a regulation device met to keep his Navel Laser in control and let him actually use it, but if he overuses it, he still suffers stomach cramps and if bad enough, diarrhea. (Possible explanation for his love of Cheese, as Cheese can be known to cause constipation) So it's not that he's Quirkless, nor is it that his quirk, on its own, is any powerful. The Belt is needed so he can actually control his quirk, and acts as a magnifier so he doesn't have to push himself as hard.
- He also says its why he was so invested in Deku, including stalking him. He sees Deku as a Kindred Spirit, someone born with a Quirk (Obviously not knowing about One For All) they couldn't control and would cause them pain when used. But he also sees Deku as someone inspiring, since Deku was able to get a hold of his quirk in the time they've been at UA without a Support Device, whereas Aoyama hasn't in 15 years and can only do so with a support device. He sees Deku as a Foil to himself, and as such is heavily interested in him.

Aoyama has learned about One For All (and how it transfers)

After the raid arc, we learn that Aoyama has been stalking Midoriya, watching him from outside his window while he sleeps. And we see him feed Midoriya some cheese when Midoriya isn't expecting it. Aoyama then eats the remaining half of the cheese before offering Midoriya more. It's possible he was trying to get Midoriya's spit in an attempt to take One for All.

A possibility, but it doesn't seem that he knows how the transfer fully works. One For All can only be transferred if the user is willing to transfer it, and Midoriya doesn't seem to be very willing to transfer it to Aoyama anytime soon, given his reaction to Aoyama's attempt.

Mina is a fan of Star Trek: The Original Series or something similar.

Why. Because not only does she look like a Pink Skinned Space Babe, in her hero costume, she dresses like one too. And she had to her inspiration from somewhere.

Alternatively, a close friend or family member is the fan and convinced her to take the look and run with it.

Recovery Girl has a relatively large family, all of which inherited her Quirk on some level.

Her Quirk is stated to be rare, but not unique, should anything happen to her, one of her children will take over her role at U.A., the thing is that even with a large family, her Quirk is unique to her family, so it is still considered absurdly rare as her descendants are scattered all over the world trying to make the best use of their abilities.

Recovery Girl's Quirk is Cast From Hitpoints.

A lot of Pro Heroes have titles; for instance, Yaoyorozu gives herself the title of "The Everything Hero", Tsuyu gives herself the title of "Rainy Season Hero", and Tokoyami dubs himself "Jet-Black Hero". Recovery Girl, whose Quirk involves healing wounds, is dubbed the "Youthful Hero". It's possible she received that title during her youth and it just stuck, but most Quirks have a physical cost and all of them have a physical mechanism, whether it's Bakugo's explosions being capable of injuring him through kickback, Todoroki having to regulate his heat to avoid frostbite from his right side, or (most obviously) Midoriya's early use of OFA breaking half of the bones in his body. Recovery Girl's healing Quirk may come at the cost of her own physical age, using her DNA as a catalyst to repair the injuries of others; she could very well be in her thirties, and from using her Quirk so much, she may have rapidly aged.

This, of course, invokes some Fridge Horror: Recovery Girl hasn't been on-call for any of Deku's injuries since his fight against Todoroki at the Sports Festival, and said that she wouldn't treat him for anything else that severe. What if treating any more of Deku's wounds with her Quirk would literally kill her? And it's implied that healing Quirks are very rare...

This should be Cast from Lifespan instead of Cast From Hitpoints, but otherwise it's a good theory and very plausible.
- Jossed- Recovery Girl has been with U.A. for forty years. Unless she was there since she was negative 10 years old, it seems like she really is as old as she looks.

Hagakure will hone her light-manipulation and eventually gain force field powers.

They're a great defensive ability, and there isn't a Barrier Warrior among the cast yet. She already has Susan Storm's initial codename and powers. Should her powers be delved into more, it'll bring the reference full-circle and coincide with her taking a level in badass.

Momo Yaoyorozu's family made their fortune by illegally stockpiling gold made by their Quirk.

If her Quirk is hereditary, then it wouldn't be out of the question that they could convert their fat into gold. It would make sense given how unbelievably huge their estate is.

If they really were engaged in such illegalities - them being connected to the Yakuza is a quite popular theory - it feels strange they'd allow their daughter to become an heroine, a potential future enemy of their own affairs. However, they may have decided to protect her and keep her completely out of their criminal activities, to the point of even accepting her heroic aspirations; they may later use their connections to send her working far away from them.
Alternatively, that may be how the family originally started their business, but they have amassed their wealth through more honest means in more recent generations. Still, Momo may know about her family's former wrongdoings and might be a bit self-conscious about it. She did seem rather quick to shut down the idea of her making extra money with her quirk.

Dabi has a dual quirk like Todoroki.

Being honest, having fire only as a quirk would make him a hella underwhelming rival for Todoroki, as well as being lackluster and boring compared to his peers. It's generally accepted Dabi is an illegitimate son of Endeavor, and it's possible he has a (different) dual quirk from Todoroki attained from whatever harlot he came from.In contrast to Todoroki, he flaunts Endeavour's quirk will suppressing his other out of shame for his maternal side, and like Todoroki will likely only choose to use it after some traumatic development.

Kind of has a problem though. Were Dabi to have a Dual Quirk, then he would have been the first success of Endeavor's instead of Todoroki, and Endeavor would have tried training him as the entire point of the Quirk Marriages was so Endeavor could have Dual Quirked Heir to surpass All Might. So, if Dabi had a Dual Quirk, why did he move onto Shoto? It's not like simple defiance would be enough, since Shoto does enough of that already and Endeavor still focuses on him, and if Dabi is Dual Quirked, it wouldn't be because of the Non-Fire Quirk as Endeavor picked out the mother. So, what exactly would be the justification behind him ditching Dabi if Dabi did have a Dual Quirk?
- He is clearly illegitimate (his hair is neither red nor white), could be from some harlot in a one-night stand or some woman who ran away after s brief relationship, rather than Endeavor ditching her. Additionally a dual quirk which is more subtle simply might not be apparent in early life. He's unlikely to be any sibling Todo actually knows about.
- He could very well have dyed his hair rather than being illegitimate. If we're taking hair colour to be indicative of quirks, Fuyumi has white hair with red streaks, possibly hinting that she has ice with a bit of fire - not quite the half-and-half state Endeavor wanted. It's possible that Dabi does have some degree of duality, just not the perfect even split Endeavor wanted.

Dabi has a Fused Quirk

Much like how Katsuki's mother Mitsuki has a quirk that secretes Nitroglycerin and Masaru has a Fire quirk that creates an Oxidizing Sweat, the two allowing Bakugo to have an Explosion Quirk, Dabi's quirk is a result of Endeavor's Hell Flame mixing with his Mother's quirk, creating his Cremation Quirk.

This is based on the idea Dabi is a Todoroki by blood, but does not share the same mother as Shoto and Fujimi, rather has a different mother. It's been noted that Dabi's Quirk is actually unique compared to Endeavor's Hellflame and Shoto's Half-Hot, in that his flames are more purple-black in coloration rather than the standard orange-red. Real life Purple Flame is a result of burning Sodium Chloride, but Dabi's is even darker than that Purple. It's possible a Quirk from his Mother melding with Hell Flame is what made his flame purple-black, and presumably, stronger than Shoto's Half-Hot flames.

It could also explain why Endeavor didn't focus on Dabi and went on to engage in a Quirk Marriage with Mrs. Todoroki, as Dabi didn't produce a Dual Quirk like he desired, at first simply coming across as a different colored version of his own quirk.

As for what exactly the other quirk is, possibly a Salt Water Quirk. Rather than have command over Ice like Shoto, Dabi was intended to have command over Water, his Water being Salt Water Specifically. Except unlike the intended effect, his Salt Water Quirk manifested more as sweat similar to Katsuki and Mitsuki's Nitroglycerin quirk, so when he used the Hellflame he inherited, it gets boosted by the Salt Sweat. It could also explain the burn marks on his body. Salty Sweat and possibly Tears combined with accidental sparks from his own quirk caused his body to look burned.
Season 3 of the anime shows us that Dabi's flames are actually blue, not purple/black. So either his flames are burning copper rather than sodium chloride, or it could just be that his flames are hotter than Endeavor's.

Midoriya has an autism spectrum disorder, possibly Asperger Syndrome.

He exhibits behaviors that could be indicative of an ASD like Asperger's, such as repetitive behaviors (rocking in his chair as seen in the first episode

◊ and muttering to himself as an adolescent), highly narrow interests (namely, in heroes, hence his hobby of writing notebooks full of information on pros and his classmates), difficulties in social interaction (shy and awkward, not helped by his having been born Quirkless), and minor speech issues (tends to talk very formally, plus his aforementioned muttering).

Adding onto this, one of the lesser-know signs of ASD is being hyper-emotional— they've mostly disappeared now, but Izuku's Ocular Gushers were one of his biggest character traits.

All Might has Mixed Ancestry, and one of his parents was an American.

Consequently, All Might's American motif is from him growing up on the stories of this American parent and developing a Foreign Culture Fetish for America. This also explains his blonde hair, and his Gratuitous English.

Bonus: His American parent is from Detroit.
All Might's American motif seems to come from his time working in America early on in his career, though this doesn't mean All Might can't still be of Mixed Ancestry.

All Might is undergoing a serious identity crisis now that he can't use One For All anymore

and his character arc will be overcoming this to truly start living as Toshinori Yagi. I've always found it interesting that out of all the heroes and villains in the series, All Might is the only one who uses an explicitly different form for his hero persona while his true form is kept separate and secret at least until his battle with All For One. This, combined with some bits from the manga makes me wonder if to some extent All Might may have seen himself as his hero persona nearly all the time, even when he's in his true form. Perhaps this may have even gone to the point that he doesn't really see his true identity as Toshinori Yagi as anything except an extension of All Might. The thing is however, since All Might used up the last of One For All in his final battle with All For One, now he's in a position where All Might is something he can only be in name and in spirit. He's vulnerable now, and despite his best efforts to assuage people otherwise, he's definitely not going to be able to ignore the fact that he's essentially lost half of who he was, if not all of who he was if Toshinori is just an extension of his hero persona in his mind.

With this in mind, I believe that a good portion of his arc in the rest of the manga will be dedicated to him finding himself for who he really is, and that it will probably involve him having to accept that All Might is truly gone, something that I think will only occur when his predicted death occurs. But then due to whatever plot device gets introduced then (or maybe Eri will learn to master her quirk quickly that she can heal All Might from a fatal injury or something, but it depends on what happens in the current arc), he gets revived, and thus chooses to go on living as Toshinori Yagi.

If Twice were to have his Quirk nullified or erased...

He would straight up vanish, because it turns out he was a clone all along.

Jossed as of the Meta Liberation Army arc. Taking some serious physical damage finally showed Twice he's indeed the original. It is to be seen, however, if there isn't more to it, like that the last "him" alive would just become the "main" one... he wouldn't take it nicely if he discovered he went mad for an issue that wasn't to begin with.

Todoroki is a chimera.

As in, the real-world condition in which a pair of twins combine into a single fetus while in the early stages of development. His hair and quirk are both split perfectly down his center, much like we see in many animal chimeras

. If he originally developed as a set of twins who had each of his parents' Quirks, but then combined into a Chimera, it could explain why the two quirks aren't integrated into one the way Bakugo's parent's quirks are in Bakugo.

Gigantomachia is a sentient Nomu

All For One gave him an intelligence Quirk. While he's still a Dumb Muscle, he's still smart enough to be his own person rather than a mindless Mook.

Tokoyami's childhood is comparable to Noriaki Kakyoin.

In the sense that when his quirk manifested, he probably thought of Dark Shadow as something the other kids couldn't understand, and as such, kept to himself, much like Kakyoin did when he discovered Hierophant Green. Dark Shadow was probably his only "friend" at the time too, until his days at UA, or when he learned more about heroes.

This is supported by how Dark Shadow, in contrast to Tokoyami himself, is much more outgoing, like an alter ego showing parts of his personality he wouldn't normally. Tokoyami also probably saw maintaining a reserved personality as a necessity to keep Dark Shadow in check - were he temperamental, the results wouldn't be pretty.

Deku actually had a Quirk all along, but the Quirk is stealing Quirks

Deku wouldn't steal Quirks even if he could do so. Thus, Deku was under the impression he's Quirkless. However, Deku will accidentally steal someone else's Quirk (probably by thinking: Wow, that Quirk looks so cool! I wish I had it!) He'd get really confused, then upset when he realizes what he just did.

Deku actually had a Quirk all along, but the Quirk is breaking Fate.

How would you know you could defy fate? Break the predictions of a man with a record of 100% accurate future sight. This means that now One for All has the ability to break fate.

Considering he's now on the path of unlocking the quirk of his predecessors, which One For All assimilated at each passing, who knows if one of the previous holders had such power.

Deku actually had a Quirk all along, but the Quirk is talking to the dead.

Since there are not ghosts in the MHA universe, it did nothing. Until he was gifted a power that attached the spirits of others to him. The reason Izuku can interface with the past holders is because of his own Quirk.

Deku actually had a Quirk all along, but the Quirk is Awesomeness by Analysis.

Mental Quirks do exist, as seen in Principal Nezu, who is an animal with a supergenius IQ. Deku is able to amass pages of information about an individual, their Quirk, and the strategic implications of that Quirk from mere moments of observation. He compiled detailed information on all 19 of his fellow 1-A classmates in a couple of months. During the Sports Festival, he built a team that was able to synchronize very well. He came the closest to figuring out Mirio's Quirk, and came up with a counter strategy in a minute or so (that he still lost is irrelevant). Deku will eventually reach the memetic status of Batman in-universe, as the "guy who can beat anyone, given prep time". Like most Quirks, he has a weakness, the need to focus to avoid Paralysis by Analysis.

How Kurogiri’s body works

Kurogiri’s body is made up entirely of black mist, however besides the mist that Kurogiri uses to warp things, the mist is a sort of solid form that works and feels much like human flesh, and even contains a blood like substance inside of it that it can be used to activate blood related quirks. Kurogiri does require food, as the black mist doesn’t last forever, even the warping kind, thus him needing new materials in order to create more of it. However, how Kurogiri eats is unconventional, in that it’s essentially warped inside his body then subsequently broken down to create more black mist.

Gentle and La Brava will return as heroes.

Although Gentle may take up "Gentle Criminal" as his hero name due to his mischievous nature.

Kamui Woods is an amputee

All the wood on his body is clearly external armor, with the sole exception of his arms, which seem to actually be made of wood and he seems to actually transform his arms while using them, while this could just be a physical manifestation of his quirk its also possible he used his quirk to create a pair of prosthetics, its also possible his quirk can only grow and control existing wood not create it, and thus these prosthetic serve the double purpose of making sure he always has a source of wood on hand (pardon the pun),

Monoma has been Obfuscating Insanity/Obfuscating Stupidity since the Sports Festival

Considering that his tactic for getting ahead and eventually winning in the Sports Festival was to deliberately underperform in order to get a strategic edge, it wouldn't be surprising if he has been applying the same tactic to the Joint-Training exercise by maintaining an egotistical facade for the same purpose.

Hisashi Midoriya has a dragon head or some other similarity to a dragon

Inspired by this post

, which points out how there are lots of people in the series with weird appearances that fit their quirks, but at the same time wouldn't be expected if you only knew them from their quirks (like Mina basically being a pink alien and Tokoyami having a crow's head). In both cases, their appearances fit their quirks (Mina secretes acid and looks like an alien, Tokoyami controls a demon and his face resembles a common occult Animal Motif), but only by pure coincidence. The only thing we know about Hisashi is that he breathes fire, so, as the original post points out, him resembling a dragon isn't much of a stretch.

Endeavor will get a Redemption Equals Death

A good way to redeem his character without causing an uproar about him being Easily Forgiven or a Karma Houdini. Bonus points if it's a Heroic Sacrifice.

Touya Todoroki's personality: Very much like Endeavor, at least before the accident

Not alot of debate has been going on in regards to the personality of the oldest of Endeavor's children. However, my prediction is that Touya was very much like Endeavor, at least before the accident. He would've been brash and hot-headed, but also determined to be a hero and a hard-worker. In many ways, he would embody the positive aspects of Endeavor. It would also further explain why Endeavor originally chose him to be his successor. He was much like his father in terms of power and personality yet even exceed him, both in firepower and perhaps in people skills. However, after Endeavor's attempt to teach him one of his secret techniques goes awry, Toya changed. Maybe he cut off communication with the family for thinking he's a failure. Maybe he became embittered with becoming a hero. For whatever reason, Toya has cut off ties with his family, but for blaming himself rather than Endeavor. My reasoning is that, besides the likelihood of this, it would be a matter of symbolism and further represent why Shoto would ultimately succeed both his father and his oldest brother.

Monoma has Abusive Parents

In the Joint Training arc, Monoma mentioned that growing up, he’d been told countless times he couldn’t be a hero with his quirk. However, he never revealed exactly who had said this. So, it’s possible that instead of his peers, he developed his Inferiority Superiority Complex from his parents. Maybe there’s a Fantasy-Forbidding Father and/or a cruel mother involved who constantly belittles him and puts down all of his achievements, eventually warping his mindset to the cynical one he has now.

Gran Torino was a member of the super heroes version of a black ops team

Began re-watching the series, and I have begun noticing things that lead to this as a possibility. Deku can't find any information on him at all, and yet he clearly is a known member of the community. In one of the manga chapters he is leading a squad, and it appears like the heroes in the squad from the armed forces assigned to him are very familiar with him leading them. In addition, he seems to have access to a lot of information that not even other heroes have access to, or at least only those who have what might amount to high level clearance.

How characters passed the entrance exam

We've seen that Izuku got in on Rescue Points, Uraraka did the same with a side of using her Quirk to float the robots and then crash them down, Bakugo, Aoyama and Kirishima used their Quirks to destroy robots (but the latter was also very active in helping fellow applicants, getting almost as much Rescue Points), and Todoroki and Yaoyoruzu didn't have to take this exam but a specific one for recommended potential students. Word of God is that Mineta used his sticky balls as traps to immobilize the robots and gum up their cannons. Now, for the rest:

Iida used his Super Speed to find robots, and destroyed them with Engine-empowered kicks.
Ashido used her acid to disable the robots.
Asui probably either used kicks or used her tongue to throw the robots around.
Ojiro Bare-Fisted Monk'ed his way through the exam, using his tail to give him an edge.
Kaminari got lucky- his electricity Quirk would be super effective against metal robots.
Koda probably asked birds to help find robots, then got them to distract and disable the robots. Moving more into headcanon territory, the robots may have only been programmed to attack humans, and Koda's animals thus went right through.
Sato munched some sugar then smashed the 'bots. Fairly straightforward.
Shoji is shown using his Super Senses to find robots to fight, and may have replicated multiple hands to help take them down.
Jiro did what she was shown doing at the Sports Festival- she plugged her Earphone Jacks into the robots and used sound to disable them.
Sero probably made like Mineta and trapped the robots with his tape.
Tokoyami had Dark Shadow fight the robots. He's even seen on-panel.
Hagakure is one of the more puzzling passes, but she most likely fought them like a normal person, just exploiting her invisibility to get close and get openings. We also don't how many Rescue Points she got, as they may have got an important part in her pass.
- If the robots had a 'disable' goal switch, she could score by going for that.
Monoma copied a fellow examinee's Quirk and used it against the robots.
Most of Class 1B probably used their Quirks in the 'straightforward smash' manner.
Awase also pulled a Mineta and welded robots to the ground.
Shiozaki entangled the robots in her vines.
Kodai probably decreased the size of the robots until they were fairly harmless.
Komori likely disabled the robots by growing mushrooms in their inner workings.
Kuroiro may have first attracted some robot in an area covered by good shadows, so to use his quirk properly. He may have also got some Rescue Points by helping a fellow candidate in the same condition.
Nirengeki probably had to wait for other candidates to wreck some robots, so he could take the pieces, throw them and apply his quirk to destroy some targets for himself.
Yanagi may have similarly waited to have some scrap and debris at disposal and then use them as weapons with her quirk.
Just like Mineta, Sero and Awase, Bondo just glued and immobilized the robots.
- And that's all the ones I can think of at the moment. If anyone else has something to add, please do so.

We will get to see how Tooru looks like in a Fan Disservice moment

During a fight she'll use the stealth abilities she's honed through training (i.e. accompanying her natural invisibility with the ability to not make any noise) to get the drop on a villain; however, she'll end up shot with a quirk-erasing bullet, finding herself reduced to just a naked girl at the mercy of the enemy, if it wasn't for the presence of her friends. Even if she was to later recover her quirk - the bullet may even be of the temporary type, which is still useful to the villains -the combination of the loss of it, the embarrassment, and the sense of helplessness of that moment will be a trauma that will take some time to heal.

Tooru will learn to become visible at will

Her Quirk is a mutation and her invisibility is permanent. However, even if she's used it only once so far, she's become capable of generating light flashes, an ability connected to the light-bending properties of her body; if she learned to further control them through training, she may eventually manage to even cancel them temporarily, making herself visible to others.

Selkie used to be adorable.

He's a guy who looks exactly like a spotted seal, and seal pups tend to be really freaking cute, since they have fluffy fur that covers their bodies. It's possible that Selkie used to be cute and fluffy as a kid/teen and often tried to do that "cute" act for various reasons (publicity, ego boosting, getting people to do stuff for him, etc.) but of course, when he grew up, the effect wore off and now he just looks silly when he does it.

Spinner is Quirkless

He's only been seen fighting using knife weapons, but he hasn't been utilizing his Quirk at all, so why wouldn't he use his Quirk during battles, like in the Training Camp arc? He might just actually be Quirkless, and that could be another reason why he joined the League of Villains. But then why does he look like a turtle if he's Quirkless? Well, an "interesting video"

brings up the topic of "Mini Mutations, where a character inherits a Mutation Quirk's physical characteristics, but not the Quirk itself (which would explain why Tokoyami has a bird head, yet his Quirk doesn't relate to birds at all). So Spinner could've gotten lizard traits from his parents, but not their quirks. Further proof is in the fact that Spinner has relatively low stats for a villain (C-Rank, shared with Toga and Twice, who've done more dangerous things than Spinner has), as well as his name not having any real meaning (aside from his family name meaning "Iguana", which given Spinner's appearance, seems like an obvious choice).

It's also possible that much like Midoriya, Dabi, and Aoyama his quirk isn't very compatible with his body and has side-effects, so he holds it in reserve unless it's seriously needed. It's also possible that he has a utility quirk of some sort that is useful in some situations but doesn't do much in combat.
- Jossed after Chapter 233, where his Quirk is revealed as Gecko, a quirk that allows him to stick to walls.

Mirko, Ryukyu and Uwabami used to work together

While Uwabami's exact age is unknown, it's likely she's in her mid-twenties like Miruko and Ryukyu, who are known to be both 26 years old. The animal themes of their Quirks correspond to three signs of the Chinese Zodiac - rabbit, dragon and snake. Noticing that, back when they were new heroines fresh of graduation, they decided to form a team which may have included more animal-themed members. While it helped build their reputation (after all two of them would eventually become part of the Top 10 heroes of Japan), after some timethey disbanded and went their own ways due to growing differences and aspirations between them, with Mirko being quite individualistic while Uwabami chose to prioritize modeling over hero work. Theiy maintain, if not an amicable relationship, a decent one as, in Vigilante, they are seen giving a show together at the Sky Egg, and later Ryukyu and Mirko team up to take down one of the attacking monsters.

Todoroki will end up taking Endeavor as his hero name

In chapter 45 Iida and Todoroki were the only ones who took up their own names as their hero names, but later on Iida took Ingenium, honoring his brother's request to take on his mantle after first refusing it. Assuming Todoroki will also choose a proper hero name for himself in the future, and considering his current status as waiting and seeing how his father Endeavor goes through with his declared attempts at redemption, after Endeavor is killed, loses his quirk, or is reduced to a state he can't resume heroics anymore, Todoroki will decide to accept his father's hero alias as his own, especially if his father ultimately managed to deserve forgiveness from him.

Sooner or later Kirishima will face Gigantomachia

He will recognize the giant as that odd but very menacing villain who threatened those two girls, and was sent away by Mina while Kirishima couldn't resolve himself to act. Of course, it will trigger all of his fears of inadequacy, beside being a formidable opponent that makes Rappa feel like he was a puppy. Beating Giganto, possibly also thanks to strategy and not just raw strength, will be Kirishima's biggest test in his personal arc. Bonus points if:

Mina is also involved in the fight and injured, further motivating Kirishima to win.
Bakugo is involved in the fight and injured, further motivating Kirishima to win.
The theory that Gigantomachia used to be Crimson Riot turns out to be true, shocking Kirishima but at the same time strengthening his determination with the goal to "save" his role model turned monster.

Shinso will have a role in fighting Gigantomachia

He will manage to get his hands on the voicebox with All For One's voice, so to reproduce it through his voice changer. Giganto would be too concentrated on his target(s) to respond to any provocation, but would react to his master's voice. With his strength and likely multiple quirks, the monster may free himself shortly after but also be angrier and starting to reply to Shinso's provocations, further causing himself to stop attacking for the few precious seconds that will give the other heroes the openings they need to defeat him.

Re-Destro will die of an heart attack

His "Stress" quirk is incredibly powerful and he may become even stronger if he was further stressed by a difficult situation; he may give Gigantomachia a run for his money. However, like any other quirk there must be some limit: in this case it's that the body, honed and used to the quirk as it may be, just can't handle an indefinite amount of stress. And so, ironically, the source of his power will also be his downfall.

Jossed. He has survived the battle, even if at the cost of losing his legs.

We may have seen the moment right after Shigaraki was forcibly given his quirk

Chapter 235 is a flashback showing that at age 5, Tenko Shimura (aka Shigaraki) hadn't developed a quirk yet - but he did shortly after. The same flashback begins with Tenko's mother thanking a man for accompanying her son home, apparently just a gentle stranger who helped the kid. But what if he wasn't just a simple man, but All For One who took the chance to give the quirkless, emotionally distressed kid whom he had been observing for a while a very destructive quirk?

Toga will pull a Heel–Face Turn

My reasoning is as follows: as early as Chapter 222, we see a possible conflict of interest (albeit a quickly smoothed-over one) begin to arise between Shigaraki and Toga, where Shigaraki states that his desire is to destroy everything, before amending his statement when Toga asks if that means everything that she likes will get destroyed too. But the things that Toga "loves" the most at the moment are Deku and Uraraka, so it will be interesting to see if Shigaraki actually is willing to spare them, especially given that Deku is All Might's successor in the same way that Shigaraki is All For One's. If he decides to try to destroy them anyway over Toga's protests, that might be the catalyst she needs to turn on the villains.

The other possibility has to do with Toga's quirk and the way she processes "loving" someone, because that ultimately boils down to her wanting to become that person. And as seen in her fight with Curious, if she loves someone enough, she can copy them to the point of being able to use their quirk, in this case Uraraka's. What if her quirk can actually go further than that, and trying to "love someone more" can temporarily reshape her mental state to be more like that person's? If that is the case, then Deku and Uraraka are both very good and heroic people. If Toga "became" someone that heroic in both body and mind, even for a little while, she might accidentally apply the early stages of Heel–Face Brainwashing on herself. I think this idea is especially possible if in copying Deku and using One For All, she accidentally wires herself into the vestige network for a short time, as that could give her a much more thorough exposure to Deku's mind and what makes him heroic. From Toga's twisted perspective, it's essentially a Love Redeems arc. Everyone else on the other hand, while glad there's one less villain they're fighting, will be understandably weirded out about the whole thing.

Keep in mind that none of this actually guarantees that Toga joins up with the heroes even if it happens. She could just as easily submit to being sent to prison or rehab, become an anti-villain vigilante, or get hit with the Redemption Equals Death stick.

Shigaraki will eventually take up the villain name/title "All For Nothing"

-to reflect both his status as All For One's successor and his driving motivation of wanting to destroy everything.

Except Shigaraki himself states he won't destroy anything his minions desire.

Best Jeanist Isn't Dead

After Hawks explained the situation with the League, he and Jeanist faked the latter's murder. This will be revealed when Best Jeanist pulls a Big Damn Heroes moment.

Confirmed in chapter 291 as Jeanist makes such an entrance.

Izuku's dad was overprotective when he was around

Izuku is shy and can have a lot of self doubt to the point he seems to suffer from "impostor syndrome". When he succeds he tends to believe it was out of pure luck or help from others. Now, this isn't the only reason he is the way he is, his mom for instance is shy and not very strong willed and he took it from her. There is also the fact that nobody believed that he could become a hero due to him being quirkless and even got bullied for it, but...

He is perfectly aware that Bakugo, who bullied him the most, is an asshole. He had trouble standing up to Bakugo, but he didn't believe he was a lesser human being because of it.
He generally feels like he gets too much help when in reality he himself works very hard. Overprotected children often end up having doubts about themselves and not wanting help.
He puts a great lot of deal into not making others worry for him, this was influenced by his dad worying too much about him.
When Shoto told him about his abusive father Izuku got shocked and asked himself: "We both have the same goal, yet we are so different?" and he didn't know what to respond at first, then told Todoroki that he himself always had help. If Izuku also hated his dad or if the latter was (always) neglectful, he wouldn't think him and Shoto are that different and would probably even tell him about his own dad. Because his own dad was overprotective, Izuku felt like someone who got too much help competing with someone who had to struggle more and this made him feel more privileged and weaker in comparison.
The manga doesn't follow a lot of Shonen conventions, so the author made Izuku an overprotected child in comparison to most protagonists, whose fathers are abusive, neglectful (Izuku's dad is absent himself, but it could be that he doesn't have a choice and that it wasn't always this way) or normal. It is especially rare to see an overprotective father of a son not only in manga but in media in general.
The manga also shows different types of parents and it is possible to show an overprotective one as well.
- Also, the chapter "The Boy born with Everything" does not refer to Shoto as being said boy, but to what Izuku thinks of himself. Nobody can be literally born with everything, but on a metaphorical level it means someone born with a lot of good things. Todoroki was born with a powerful quirk and a lot of talent and his family is wealthy, but his family life sucks. Meanwhile, Izuku was sheltered too much and his parents very likely loved and respected eachother as well as him. He lives in a simple apartment, but he is financially secure (he isn't rich, but might be higher middle class). Sure, he was born quirkless (or at least this is what is believed to be the case), but when All Might gave him One For All due to his heroic nature and hard work and despite of this Izuku felt like All Might did everything for him, thus feeling as born with everything, even if this is not the case.
- Unlike Shoto, who hates his own dad, Izuku wants to save his. His father is working overseas and didn't come home for a long time. Izuku knows his dad would not normally leave them and feels that something is wrong, but his dad keeps on reassuring them everything is fine. The boy thinks his father is in trouble and hides it not to worry them, which makes Izuku feel uncomfortable and too sheltered. Izuku is mad at his dad for it and it's the reason he doesn't apologize to him in his monologue when he gets into trouble or why he didn't send him a picture of his hero license like he did to his mom and All Might, but not mad enough to want to leave his dad. The police can't do anything about this, so he thinks that if he becomes a superhero his dad might finally trust him to tell him what is wrong, or he might use his abilities as a superhero to save him. If the theory of All For One being Izuku's father is true, then Izuku, being very observant, might've figured it out his dad has gone blind (he didn't figure the All For One part, though).
- In addition, Izuku decided to become a hero in order to make his dad feel safe. When he was little, Izuku saw how much his dad worries for him and wanted to become his (and his mom's) hero. Of course, the boy does it for other people as well, it's just that he puts his parents at priority. At first he only wanted to become a superhero, not the number 1, but he wanted to after his dad left.

Hawks' father was a criminal if not a Villain

The second Character Book has revealed Hawks' real name to be Keigo Takami. In chapter 250, the villain Ending recalls the time he saw Endeavor arrest a thief called Takami. Given how Keigo grew up in a poor and possibly abusive household (a panel of him as a kid shows garbage and bottles on the floor behind him), at least originally his father may have resorted to crime even to just put some food on the table, but kept committing crimes afterwards until his arrest years later. While Keigo owned an Endeavor toy as a kid, his specific interest in the then #2 Hero may have started upon learning his father was arrested by him.

Confirmed in chapter 291. His father was also responsible of several murders and it's a reason why Hawks' true generalities were unknown to the public (altough, for all we know, he may have been given a different last name).

Kurogiri is Oboro Shirakumo

At the end of Chapter 253, Gran Torino reveals that analyses on the currently imprisoned Kurogiri have found out his Warp quirk was made up from a fusion of other quirks, the base one being Cloud, the quirk of the presumedly long-dead UA classmate of Eraser Head and Present Mic.

As the recent flashback arc in Vigilante has shown, Shirakumo was last seen hit in the head and buried by rubble after protecting a group of kids from a villain, and after the battle just a bloody blanket over his corpse was seen. But was he really there? He may have been pronounced dead while in truth he was in critical condition but still alive, and brought to the Doctor who kept him alive before doing all the operations that resulted in the Warp quirk and his new appearance. Alternatively, his corpse was effectively revived in a Frankenstein-esque experiment. Either way, as the second character book revealed, the Doctor owned and managed several hospitals so he may have had easy access to him.

Kurogiri may fully remember his past and have embraced All For One's cause out of gratitude for being saved and given a new life, or he may have completely forgot and effectively be a new individual today, even if that may open the door to a plotline of him getting his lost memories back, followed by an identity crisis and a redemption.

It's also worth noting that "Shirakumo" and "Kurogiri" are thematically opposite names, meaning "White Cloud" and "Black Mist" respectively, signifying a once clean and pure individual now twisted into a villain.

Sort of. He's a Noumu made from Shirakumo's corpse.

Kurogiri is not Oboro Shirakumo

Every new reveal about the Doctor's work on behalf of All For One leaves some doubt on how far their horrifiying experiments could go; for all we know currently, they may be even capable of extracting Quirk Factors from freshly dead people. They got hold of Shirakumo's corpse - they couldn't let a quirk like his go to waste - and harvested it for whatever material was needed to reproduce his quirk, and then combine it with the others needed to result in the Warp quirk, which was finally given to another individual.

Therefore Kurogiri would be not Shirakumo by any means but it still would be emotionally devastating for Eraser Head and Present Mic: at the very least, the body of their friend would have been horribly desecrated to create a villain.

Confirmed-ish. Kurogiri is a Noumu created from Shirakumo's corpse. While Aizawa doubts that there's anything left of his friend, but Naomasa hopes that Kurogiri retained enough of Shirakumo's personality (much like how High-End retained a love of fighting) that Aizawa can reach him.

Aoyama will become an Ascended Extra.

Seeing as how there were two entire chapters dedicated to him befriending Midoriya. Granted, that was almost a hundred chapters ago, but he has just as much emphasis put on him in the early chapters as Bakugo, Uraraka, and Iida, all of whom are main characters. He's bound to become more important eventually.

Shirakumo's family will be introduced.

Seeing as how the current arc is focusing on his ultimate fate, it makes sense that we'll eventually hear from his family. If he had a younger sibling of some sort (particularly if they were only a baby when Shirakumo died or were born sometime in the intervening years), they could befriend Midoriya and company. Depending on just what's going on regarding the Shirakumo-Kurogiri situation (namely if Kurogiri is Shirakumo in a Winter Soldier-esque state of brainwashing or if Kurogiri is his own person and Shirakumo's body was just used as the base to make him), they'll serve as Morality Pets.

All For One's Brother resembles Shigaraki personality wise.

Tomura Shigaraki is a Psychopathic Manchild who is the successor of All For One. The brother of All For One is the first One For All user and the one who started the war against All For One and there is evidence to suggest he was a great hero, but the truth is, he has his flaws. He is more or less immature himself, tends to go without a plan and might be arrogant and stubborn. Of course, he doesn't go near as far as Shigaraki and he most likely truly cares about justice (or at least he thinks he does), but the flaws are still there. Also, he would not accept the fact that he resembles Shigaraki. All For One wasn't entirely wrong when he called him weak and pathetic.

Toga will suffer a Karmic Death.

She'll die in a bloody, gruesome manner similar to how she killed her victims, either at the hands of another villain or by accident while trying to kill one of the heroes.

If not her, than Dabi will.

Either via being frozen to death by Todoroki or drowning somehow.

Toga will see Twice as a father figure.

She doesn't have a good relationship with her parents but gets along well with Twice, who is much older. Of course, this might result into Squick considering he has a crush on her.

Maruta Shiga is not "Daruma Ojiko"'s real name either.

Considering that Maruta Shiga (or whatever he'll be renamed to in the next volume) is labelled as Quirkless in his "introduction" despite truly having a Longevity Quirk (albeit one he gave himself), what's to say he's lying about his public name too? He did say that he's tried to keep his personal information secret, and that could just be a name he's using to hide his real identity. Plus, the fact that he looks so much like Dr. Tsubasa...

Midoryia has a manipulative side to him.

He is not as innocent as he seems and is able to control people like puppets. He probably uses this just for good though.

This side was present at the fight between him and Hitoshi. Think about it, why would Midoryia fall for Hitoshi's trap and answer his question knowing about his quirk? Why wouldn't Deku just keep his mouth shut and beat Hitoshi up? Deku is used with far worse insults from Bakugou and is still usually nice to the latter after so many years. And if he really was mad at Hitoshi, why not just beat him up and win against him? The author could've easily kept the match between Deku and Hitoshi the same without making Deku look stupid by just not having Deku know about his opponents quirk. Keep in mind, before the sports' festival, Deku considered not participating due to the destructive nature of his quirk and beeing already under All Might's wing, but decided to participate when All Might told him that there's a difference between the ones who try and the ones who don't. Midoryia was able to win the first event by using a piece of metal and ingenuity. He was in a team in the second event and they've managed to qualify for the last event with their powers combined. However, Deku had no chance to have results at the last event without using his quirk at a high level. Because he didn't have high chances of winning the last event and was tired of breaking his bones, Midoryia decided to give up. However, he didn't want to ruin his reputation of somebody who always tries, so he faked giving in to his emotions in order to lose. After the OFA ghosts broke the effects of mind control Deku saw that he has no other choice but to continue. When he called Todoroki out for being unfair to the other contestants by not using his entire quirk Deku was actually mad at himself too for almost giving up. Keep in mind, the story is told by Deku, it's very likely not entirely true. At Hitoshi's and Midoryia's match we had someone who has a mind control quirk vs. someone who can control minds by classic manipulation (Deku didn't use it to win, on the contrary, he used it to lose, but you get the idea).
Another example of his manipulative side is what he said about OFA being activated after the dream in which he met the other users' ghosts. Think about it, why would a simple hand touch with the first user, even if he is a ghost, activate the quirk? What makes the whole thing even more suspicious is that none of the users introduced themselves, nor did they tell Deku what was going on at the moment. He was staying there, missing a good amount of his body and the rest didn't do anything about it. The users that were only silhouettes have an excuse, but the other ones don't. This was especially frustrating for Deku, because they didn't have to risk their lives, only to tell him who they are and what was going on. Also, Deku overlanalyzes things, he hates the fact that the first user only gave him vague information about himself and his brother. Finding out that the first user was AFO's only family member left and that he locked the younger one in a vault really made Midoryia question how evil is and was AFO and how moral his brother is. Deku actually tried to punch the first wielder, then he lied about OFA being activated by accident, because he wants to be on the users' good side in order to obtain as much power as possible from them and is waiting for the right moment to get revenge on them.

All For One will suffer A Fate Worse Than Death.

Especially if All-Might does a Heroic Sacrifice. In contrast to his enemy dying a fruitful death he chose, All For One will end up being forced into a situation where he lives forever in eternal pain and despair.

Toga is Too Kinky to Torture

At some point somebody will try to give her a taste of her own medicine and claim that they are showing their love by torturing her, but she will enjoy it.

All For One's brother's name was Tomura.

The first user looks a lot like Tenko (naturally it's the other way around in-universe), and we now know that "Shigaraki" was the brothers' surname. It would be quite the thing if he rechristened his successor after his brother both to say that "Tomura is on my side" as he so very much wished during his brother's lifetime, and as a massive middle-finger to every user of One For All with the implication that the image of the first user is their enemy.The fact that Tenko is Nana's grandson was just icing on the cake.

At least one character will get an Expository Hairstyle Change.

Maybe Deku's hairstyle will be changed to look more like his original design. If not him, somebody else will change their hairtsyle.

Stealing or breaking any of Deku's All Might merchandise is a serious Berserk Button for him.

If you are reading this, you most likely have the same expectation as I do. If you touch Deku's merchandise you're dead. I'm surprised nobody wrote this theory here before.

Daruma is inspired by Emperor Palpatine.

All For One clearly has some inspiration fro Darth Vader. Daruma and Palpatine, while very different, are both villains who would rather plan than fight directly. Maybe as the story progresses Daruma will show more similarities to Palpatine.

Kirishima's parents are a lesbian couple.

The irony of Mr. Manliness coming from a predominantly female home would be funny.

Butch Lesbian anyone?

Nearly all of the major League of Villains members will die by the end of the series.

Magne and Twice being killed (and getting tragic, significant send-offs too) sets up a pattern for what will happen with the members who remained after the attack on the school trip. Here are theories for how each member is going to go down:

All for One will be killed by Shigaraki in a raid on Tartarus to solidify the Passing the Torch theme, possibly because Shigaraki is not entirely content with the fact that AfO can take control of his body. They may still be able to interact afterwards in a similar manner to the One for All vestige world.
Kurogiri will begin to show shades of Shirakumo's personality in a way that will make Shigaraki decide it's too risky to leave him alive (as he could end up helping the heroes); he already seemed willing to kill him as far back as the USJ simply for letting Iida escape. He'll be killed in the Tartarus raid.
Dr. Ujiko might end up surviving, but an ironic possibility would be him getting killed by a Nomu he can't control. He may also be killed in the Tartarus raid (assuming that's where he ends up after his arrest in the Paranormal Liberation War arc) because Shigaraki decides he has outlived his usefulness, but given how competent and loyal the doctor is, this seems unlikely.
Shigaraki's fate will be the most straightforward; he will be killed in a final battle with Midoriya.
Assuming Dabi is Toya Todoroki, Endeavor will perform an Heroic Sacrifice in a fight with him which will lead to both of their deaths. Alternatively, Dabi will go overboard with his Quirk while trying to kill Endeavor (who will be reluctant to fight back due to his feelings of guilt), and will succeed but end up burning himself to death.
Spinner will perform a last-minute Heel–Face Turn after becoming dissatisfied with the collateral damage caused by the League. He will be killed in the process.
Toga will be fatally injured in a fight with Ochako. Ochako will take pity on the dying villain and offer some small gesture to finally return Toga's "love". Alternatively, Toga will have a final moment of sanity accompanied by a Heel Realization, but far too late. However, Toga has a higher chance than the rest of the League to survive due to her age, but it should be noted the series hasn't entirely shied away from Death of a Child and she's almost an adult anyway.
Because not much is known about Mr. Compress, it's harder to guess how his death would tie into his character, but it's possible he'll become trapped in one of his own marbles as an ironic punishment.
Gigantomachia will be captured at the end of the Paranormal Liberation War and will not die. If he instead ends up getting away unscathed, he will be taken down by class 1-A as a group as a way to make up for their failure to do so initially.
Giran will be forgotten about or get arrested as an afterthought, but will survive.

Chimera from the second movie was affected by a persecution complex

Little is known about him but the general gist is that his heavy mutation caused him to be bullied and persecuted, ultimately leading to become a villain by joining Nine. Yet, as many fans have noted, his incredible strength and versatility would have easily made him a Top 10 hero if he was on the other side of the law. And not like his looks would have been a deterrent as even villainous-looking heroes can reach high ranks (see Gang Orca). However and sadly, from a very young age Chimera suffered from severe self-image issues that led him to conflate any wrongdoing against him - when you think for a moment, few people would actually try and pick on him once they realized his strenght - ultimately causing him to start reacting even violently, in a vicious downward spiral. While there would be still responsibility from people who could have better helped him growing up, most of Chimera's demons were unfortunately self-made.

Dabi is a Green-Eyed Monster towards Heroes

According to Endeavours flashbacks, Toya used to want to be a hero and wanted to get trained by his father. Also according to the flashbacks, it was Endeavour who was concerned about Toya's well-being. What happened after the family thought Toya died? Endeavour decided to make Shoto his successor. This is what truly made Dabi angry at all heroes. While he does have a point about the wrongdoings of his dad and the hero system, the reason why he hates all the heroes is because the they have something he feels he could never achieve and therefore doesn't want anyone to have it. This is also the main reason he wanted Shoto dead.

Deep down AFO truly cares about his subordinates

He might not love them or see them as outright friends, but he is geniuenly pissed if they get to suffer. Him acting nice towards them is not just Pragmatic Villainy, he is geniuenly grateful to them. He wouldn't hurt them, at least not as long as it doesn't benefit them and even then he's not happy about it. He might not be always honest to them, but if he always keeps his promises towards them. AFO actually cares more about the league members than Dabi does. Dabi, while honest about it, doesn't care about them. AFO might tell the league members some lies, but still cares about them.

What All For One truly means isn't everything for himself, but nobody left behind

There is no denial that he is evil, but considering Shigaraki's backstory, society has a serious Bystander Syndrome. The phrase "All for one and all for one" comes from "The Three Musketeers" novel. There "all for one" does not have a negative meaning, it actually means nobody left behind. What AFO tries to obtain is a society that doesn't leave you to die on the streets like in Shigaraki's case. The conflict with his brother came because the younger one refused to listen.

Shirakumo never died

This troper find it odd that Kurogiri is a nomu and get he has mental functions on par with a human. The High End Nomus we've been shown are said to be able to think and learn but they are hardly coherent. This troper was trying to figure out how this might be and thought that perhaps, Shirakumo's wound wasn't fatal. Perhaps his mental abilities never declined to the point of a high end's was because he was turned into Kurogiri before he was rendered brain dead. Keep in mind that one's personality can change in extremes after head trauma, especially if there were underlying issues. Then add in behaviour modification and you could have someone like Kurogiri that doesn't know he's someone else. If one actually looks at cults and the process of indoctrination, you can see that Kurogiri's one tract mind towards his purpose of caring for Shigaraki is reminiscent of how cults can assign tasks to members and have them under the belief that it is necessary to live. It's also telling that Kurogiri, someone who's usually so mild mannered, immediately grew defensive when confronted about not being someone he thought he was. It is similar to a reaction from cult members who have their ideologies questioned and defences raised.

This troper's most damning evidence however, is that Shirakumo actually made an appearance. If Shirakumo was dead, shouldn't his personality be dead too? There might be lingering characteristics, but Shirakumo actually appearing, calling to shota, and giving him a vital piece of information is super weird if he's supposed to be dead. Ghosts and bringing people back to life like that isn't really this work's style. It would make more sense if you thought about it in the way that Shirakumo never died, but his personality and behaviour was modified to the point that his authentic self was buried. It would make sense that he's still there, and also provide an explanation for his unusually high intelligence.Also, to explain the quirk, Cloud WAS used as a base for warp gate. All for One can merge quirks inside of himself. It's not too farfetched to believe that the process of making Shirakumo different body-wise could be done while he was alive. In fact, such extreme modification could be used to further distance Kurogiri from Shirakumo on a subconscious level.

Dark Shadow is not Tokoyami's Quirk.

Tokoyami's Quirk is the bird head, and the ability to store the "Darkness" energy that Dark Shadow needs. Dark Shadow himself is the manifested Quirk of Tokoyami's fetus-in-fetu twin. Evidence for this is the fact that Dark Shadow seems to have his own personality, as well as his own volition, cooperating with Tokoyami's requests on a voluntary basis. We never see Tokoyami able to force Dark Shadow to do anything. Shadow's behavioral shifts are a side effect of his Quirk.

Mei Hatsume or Melissa Shield will become an Iron Man-like Science Hero.

Mei essentially created a set of ODM Gear for the Sports Festival. Melissa created the Full Gauntlet, which was able to withstand the incredible force of One For All. Either one of them could likely create a Powered Armor suit capable of Pro Hero activity. The legal authorities will allow it due to the need for heroes.

Midoriya and Shigaraki are cousins

All Might mentions that Deku's mother looks like Nana but their Quirks are similar too, Nana can levitate herself while Inko can attract objects towards her (and they seem to stay suspended until she grabs them). We know Tomura can decay people and that it spreads from point of contact, what if the Shimura family's Quirks work by affecting molecular structures? Eg. Nana's "Float" is her exerting force upon the surrounding air molecules to push herself up and Tomura's "Decay" is a mutation of it that causes molecules to exert force on each other and break apart the object they are part of.

Now Inko's Quirk could work similarly, where Nana "pushes" she "pulls". It could be that Inko is a niece or something of Nana's.
There are also visual hints like Tomura and Izuku's shared preference for red shoes. Both their childhood selves look identical with Izuku simply having curlier, different coloured hair (unless its a case of only six faces).

The first One For All Wielder is the real megalomaniac

When the all brothers were fighting, the younger one accused the older of being a meglomaniac, but the latter asked who the real megalomaniac is. All For One is evil and obsessed with power, but that doesn't mean he's a megalomaniac. Not to mention that he probably wasn't as bad when the fight with his brother started. Deep down All For One might truly care about some people and he is perfectly aware that he wouldn't have come this far without his subordinates (even if he sees them only as tools) and that he still needs them. He's trying to specifically instigate fear and hate of him in most people, what kind of narcissist would want that? He als has a (mostly) realistic view of his own capabilities and does not put his subordinates down or carve constant admiration from them, not even in subtle way. He also believes that you can always become more powerful at everything. His brother on the other hand, does have an inflated ego. He has a Holier Than Though attitude, is more concerned about gloating about his deeds than the fact that Deku was missing parts of his body, wasn't successful in the fight against his brother, yet puts himself on a pedestal. The main reason he lost was his pride. He doesn't always brag on, that's because he's mostly a covert narcissist. When he's telling Deku he'll be watched, it's because he has a big ego and likes to point out how good he is at protecting Deku. He also hates the fact that for a long time he thought he was quirkless and after discovering he actually had a quirk, he became obsessed with it. All For One might've been doing bad stuff in the past too, but his brother was relly self projecting the thing about megalomania.

Future arcs/events theories

Class 1-A and Meta Liberation Army match-ups

Todoroki vs. Dabi AND Geten
- Requires Todoroki to push his flames to the point that they are hotter than Dabi and his ice is colder than Geten. This will be his ultimate challenge.
Uravity vs. Toga
- Toga loves her after all, and may even try and use her quirk against her
Deku AND Kacchan vs. AfO Shigaraki
- Until one of them gets killed, and the other has to use OfA to finish Shigaraki

Endeavor will hilariously come to the conclusion that Midoriya is All Might's bastard child, like his son did...and then not so hilariously twist it to force Todoroki into beating Midoriya

I think that Endeavor, much like his son did, might think that Midoriya is All Might's illegitimate child due to All For One's comments regarding All Might passing his strength on to someone, and he instead interprets it to mean that Midoriya is All Might's bastard child. After all, he did meet Midoriya and see that Midoriya's Quirk is eerily similar to All Might's, and being a detective, he would probably end up coming to that conclusion.

Building from this, I kind of get the feeling that now that Endeavor isn't able to get what he wants regarding All Might (being Number One on his own merits and instead getting it because All Might was forced to retire after losing One For All), that he's going to end up forcing Todoroki to outdo Midoriya and thus by proxy proving himself better than All Might via their "progeny".

There will be four Five Man Bands in Class 1-A

With 20 people, it's possible. It's very likely that Midoriya, Bakugo, Yaoyorozu and Todoroki get their own teams. With Midoriya's team consisting himself, Uraraka, Iida, Tsuyu and Mineta.
- Entirely likely if the Sports Festival has a team event later on. Which, at that point will define the Five Man Bands.
- Partially Jossed. There was a team event, but the teams themselves were mostly unpredictable such as Iida choosing Todoroki over Midoriya and Midoriya choosing Mei and Tokoyami. Also, the teams were of 2-4 people instead of 5.

There will be a villain who felt that he/she had no other choice due to the nature of his/her quirk

This is an alternative to the "quirk-less villain" WMG based on the events of chapter 34 which showed that Shinsou was often compared to being a villain due to the nature of his quirk. It would not be surprising if there is at least one actual villain who became so because he/she felt that there was no other choice, not unlike Jinx. The quirk does not even have to be of a villainous nature as it is perfectly possible that people with weak or silly quirks get mistreated, hence driving them towards a path of villainy (even quirks that only seem useless, as in the case of Royal Pain's ability, could end up being mocked).
- This might actually be the reason Tomura Shigaraki became a Villain in the first place. Someone with hands all over their face who has petrification powers doesn't exactly scream "good guy".
  - Actually, Tomura doesn't act like a victim of circumstance of the Then Let Me Be Evil variety, as he's noted as being an incredibly sadistic person who just wants to destroy things regardless of the reason for it, and it's all stated by his mentor that he was an Enfant Terrible.
  - Tomura's flashback shows that he Used to Be a Sweet Kid, but was driven to villainy by a combination of his abusive father and his destructive quirk manifesting. All for One then took him in and encouraged his destructive tendencies for his own ends.
- However, Himiko Toga seems to have elements of this. Her transformation quirk comes with the side effect of being absolutely obsessed with blood, which led her to be socially excluded, especially after she gave in and drank someone's blood for the first time. It's even pointed out in her flashback that 'fascination' and 'blood' just isn't a good combo for a normal life.

Endeavor will become a villain

Izuku will expose him for the glory-seeking scumbag that he is, which will cause the other heroes to blacklist him.

Looks to be on the way to being Jossed. Endeavor has not only approached Toshinori for advice on how to be the new Symbol of Peace, the Narrative implies he will undergo a Redemption Arc, with even Shoto and Inasa noting he seems to be serious in his attempt to change.

Mongoose will either lose her Quirk or be made into a Nomu

Her paralysis Quirk would come in handy in tight situations. If there was any way to make Tsuyu lose her cool, it would be that.

The Rock villain from Chapter 57 will be the next Arc Villain

Out of all the villains seen in the montage of Chapter 57, the hulking, rocky-looking villain was the only one absent from the Vanguard Action Squad. That's because he's an independent villain. Like Stain, he's a Hero Killer. However, unlike Stain, who believed what he was doing was for the greater good, this villain will misinterpret Stain's goals and kill heroes For the Evulz, judging by his rather nightmarish Slasher Smile.

That was an Early-Bird Cameo of Gigantomachia. It took almost 100 chapters to see something about him again, and over 150 to finally have him revealed in full.

Recovery Girl will die

She will get taken out by a villain after seeing her healing abilities in action, because Shoot the Medic First.

And probably a new person with healing quirk will show up to replace her.

The manga will end with another fight between Midoriya and Bakugo

But this time, Midoriya wins.

A future arc will feature a character who is an Expy of Captain Underpants.

He'll be a pro hero with a Flying Brick or Lightning Bruiser power set, but does all of his heroics in his underwear and acts as a humorous counterpart to All Might, even trying to become number one hero after the latter's retirement. He'll be a somewhat major character in a lighthearted Breather Arc, and there will be a lot of jokes revolving around him fighting in his underwear (i.e.: what kind of pervert...). Bonus points if he's the principal of a rival hero school.

The League of Villains will face civil war.

Considering how other members joined due to believing in Stain's teachings and Shigaraki has his own ideals, it is very possible that as Shigaraki moves forward the followers of Stain's sense of justice will cause internal dissident. Case in point, Spinner is already questioning things.

Seemingly jossed as of the Meta Liberation Army arc, as the events have greatly strengthened the group for the time being. If anything, Spinner looks to have decided to pledge his loyalty to Shigaraki.

Eri and Twice will both be used to explore the idea that sometimes being quirkless might be the better option.

Both have quirks that can be seen as extremely harmful to themselves and/or others. Eri's quirk may be impossible for her to learn to control without some fatalities along the way, and Twice's quirk appears to be the source of his distress and shouting at himself. However, the two of them will both be used so that the arc approaches the subject with more nuance, with both of them coming to different conclusions. Eri will resolve to learn to control her power, while Twice will ultimately decide to use the Quirk-erasing drug.

Appears to be jossed as of Chapter 229. Twice, after getting his arm broken after being attacked by Skeptic, realizes he is the real Twice, and starts using his Quirk again to copy himself.

Stain will pull a Heel–Face Turn through Midoriya, or realize his errors before he dies.

Either the League of Villains or All For One will come after Eri.

Eri's power is too absurdly broken for the bad guys not to want keep messing with it, particularly since, if her rewind ability can be controlled, it could potentially be used to do things like return All For One to his prime or restore quirks to people he has already taken quirks from, allowing him to stack powerful quirks almost infinitely. Worse still, the League of Villains has already stolen the quirk-erasing bullets manufactured from Eri's blood...and might find themselves wanting to get their hands on her if they're keen on making more of them.

All Might is sterile

All Might is a very fatherly type as we've seen, so why would he not wish to have children? Simple: he CAN'T have them at all! He originally COULD but All For One ended up wrecking his reproductive system when he attacked him (remember, All-Might's stomach was DESTROYED from his attack) All-Might was planning on finding a nice girl to settle down with, but he lost drive to pursue romance since he ended up being crippled by it and didn't wish to burden someone like that, so he wouldn't have a chance to have kids even if he still could.

There isn't much sign that he had interest in romance to begin with. Also adoption.
His injury wouldn't really affect his reproductive organs, though it would likely cause some issues in the bedroom. More likely is both a lack of interest in pursuing a relationship and that anyone close to him would be targeted by villains like what happened with USJ. You'll notice he doesn't exactly have a lot of acquaintances from before his job as a teacher.

Hawks will lose his wings.

People have already started pointing out the Icarus parallels with Hawks. Examples so far:

Icarus was a guy who grew cocky despite his father's warnings and flew too high, resulting in his wings burning and him falling to his death. Hawks has wings, seems rather arrogant/brash, and ascended incredibly quickly in the hero rankings.
Hawks is now working with Endeavor who could easily represent the sun, and there's reason to suspect Dabi, another fire user, will be involved in this arc.
There's also that panel of him flying up with a bright light shining behind him, which others have already noted looks like a Icarus reference.

Given these parallels, it's hard to believe that Hawks isn't going to suffer in some way. My guess is that one or both of his wings are going to be severely burned, leaving him in serious pain and effectively quirkless, but he'll continue to fight because "that's what true heroes do". After the battle he'll then be forced to retire, and the public will further lose confidence because they've now lost two top heroes in a relatively short amount of time and Endeavor is struggling to live up to All Might's legacy.

On top of it, both he and Endeavor battled a very odd Nomu. It's possible that will be when it happens.

With the reveal that he's working as a double-agent in the League of Villains, it could be that when this deception is uncovered this will be how they punish him.

Related to the above, Endeavor will die or be forced to retire in battle with High End

The High End Nomu is too odd to not do something big, and it would certainly keep the villain effectiveness train going if, so soon after All Might retired, the next best hero in Japan (and possibly the third best as well if Hawks also gets maimed or killed) are taken out in short order.

It is Endeavor that will eventually die in a Heroic Battle against All For One

That's it, really. Or just in any battle that will hinge on the Number One Hero winning just to thrust people into despair.

Hisashi Midoriya, Izuku’s father, will show up and become important to the story.

If you really think about it, Hisashi is one of the most mysterious characters in the show; he has only a little blurb in Inko Midoriya’s character profile, and a single mention by his wife in Chapter 1. We don’t even know what he looks like! Given the track record of the Disappeared Dad being important in many different shounens, this troper thinks Hisashi could be important as well. What exactly his role would be is anyone’s guess, but I think he’ll make his appearance in the future.

Possibly confirmed—Word of God has stated that Hisashi will make an appearance in the future, but hasn't stated whether or not he'll play a major role.

There will be an arc that'll explore the origins of Quirks.

The Internship Arc gave one theory that Quirks come from viruses, which was part of the Arc Villain's motive, so it wouldn't be much of a surprise future arcs further explored their origin.

With the obvious inspirations from Marvel and DC, I wouldn't be surprised if aliens were conducting experiments that resulted in Quirks.
- Isn't that the world setting of the Wild Cards series?

The series will go into Deku's second year at UA.

Classes 2-A and 2-B will be almost the same as classes 1-A and 1-B, except for one of the minor characters from 1-A ending up in 2-B, and Shiozaki ending up in class 2-A.

There will be a school shooting arc.

The villain's plan for the anti-Quirk bullets include giving some to the traitor and having them open fire on students. The body count won't be very high, but there will be a lot of students who will have to deal with being depowered.

Japan will abolish its hero ranking system.

They're trying to get the next generation of heroes to work together, and the ranking system rather pits them against each other. Endeavor may advocate for getting rid of it, as a way of showing his character development.

When Toya Todoroki is introduced, much of what we know about Endeavor will be further complicated.

The recent revelation that the oldest Todoroki child was originally meant to be Endeavor's successor seems to further show that not all was what it seemed. While it initially seemed that Endeavor kept having kids until he had Shoto, the phrasing and wording implies that Endeavor only made Shoto his successor around the time Shoto discovered his Quirk, but also when Touya was likely entering U.A. or some other hero school, given the talks of a "promising career." Indeed, given how Fuyumi is 22, it could be possible that Touya is 25 (thus making him 15 when Shoto was 5 and fitting the time frame.) While Touya's personality remains in the dark, it is unlikely it will be like any of his siblings and perhaps he may even be (or at least once was) like Endeavor. It would fit given how he had a stronger fire quirk along with the only one to have the full red hair. It'd also further set up how he seemingly would first appear to be Endeavor's Superior Successor only to fail because he could not handle his fire the whole force (much like Endeavor.) However, after the accident, perhaps he fell into the same bitter state Endeavor did or alternately, he cut himself off from his family because he blamed himself as a failure (perhaps holding a similar inferiority complex or superiority complex like Endeavor.)

Another potential shocker could be that while his siblings would expect him to blame Endeavor, he has no ill will toward their father and may indeed actually have found peace with himself. After all, if he would be like his father, then he would view his injuries as his own fault and any attempts at blaming Endeavor would be shut down by pointing out that the possibility always would've been there and he still accepted going into this. He would also probably try and help Todoroki in overcoming his own issues.

Tokoyami will be used as leverage against Hawks by the League of Villains.

With Hawks working as a spy in the League for the government, it seems inevitable that he will be eventually be found out. Hawks is also shown to have taken a liking to Tokoyami, both literally and figuratively taking him under his wing. Additionally, the League has already expressed an interest in Tokoyami when they tried to kidnap him along with Bakugo during the Training Camp Arc. When Hawks' status as a double-agent is revealed, the League will kidnap Tokoyami to use as leverage against Hawks. If the above theory that Hawks is an Icarus analog and will eventually lose his wings is true, then Hawks' attempt to rescue Tokoyami could be what causes his downfall and could lead into a character arc for Tokoyami like what was given to Iida during the Hero Killer arc, especially if the League somehow forces Tokoyami to lose control of Dark Shadow again and it is in his attempts to stop Dark Shadow's rampage that Hawks loses his wings.

Shigaraki is All for One's Unwitting Sacrifice to stop One For All

First off, I'll apologize if there are massive holes in this—I'm not too far into the manga myself and this is mostly based on stuff I picked up through the grapevine. Anyway, we know that (a) Shigaraki is the grandson of Nana Shimura who (b) in some form resides within One For All itself and (c) AFO is apparently aware of (b) I don't know the extent of the influence the Vestiges have over the current user's control of OFA, but it might be that if Deku were sufficiently pushed to use OFA to kill Shigaraki (think Batman killing the Joker in Justice League: The Nail), Shimura might be able to make OFA go haywire in some form, even unintentionally via her sudden emotional surge from watching her grandson die. That would also explain why someone as evil and cruel as AFO is so patient and generous towards a Psychopathic Manchild like Shigaraki—he needs him alive until he's actually on the altar, as it were, and he needs him to grow into a credible enough threat to do something that will sufficiently enrage Midoriya (kill/grievously wound Uraraka, All Might, and/or his mother is my guess).

Hawks will be exposed in the worst possible way

At some point the villains will find out he's a double agent. They will stage some situation where he'll be outed as working with them, and it will be broadcasted live. The government and police will step in, officially revealing Hawks' work as a double agent, but a large part of the public will think of it as a lie, just damage control to minimize the fact the hero most loved by the people was corruptible. With faith in both heroes and authorities crumbling, and people split in two factions, dark times may come for all heroes, who would be looked on with increasing suspicion.

The thing in Hawks' bag isn't Best Jeanist's corpse...

...but an effigy created by Jeanist himself.

Near the end of the series, the boarding house will be destroyed

A big offensive of the villains will escalate into a massive attack against U.A. and, while they'll be ultimately driven away, the campus will be severely damaged, especially the Heights Alliance which will be razed as an act of spite by the villains, and some deaths will happen. After somberly recovering what little of their effects has remained within the rubble (like Deku's All Might memorabilia), the students will have no choice than going back to their respective homes, marking their Darkest Hour as they cannot even stay all together like they had been used for quite some time at that point. They will however recover their fighting spirit thanks to their families, leading to the preparations for the Final Battle.

With the huge power-up Shigaraki has obtained, the probability of it happening is much higher...

Izuku's father will come home when All Might dies.

All Might is on borrowed time. Sir Nighteye foresaw his death, and those foresights are guaranteed to happen. Because of this, Izuku is going to lose his father figure. And seeing his real father again will cause even greater emotional turmoil.

While we don't know exactly how Izuku feels about Hisashi Midoriya, his dad seems to play little to no part in his life. Izuku is a spitting image of his mother in both appearance and personality. Inko has been shown to be the only parent around while Izuku was growing up and experiencing struggles, from not having a quirk to being bullied by his peers. When he was accepted into UA Academy, the first two people he wanted to tell were All Might and Inko. He has never once brought up his dad in a conversation.

On top of all this, they possibly act as each others' foils. Hisashi is related to Izuku by blood, but he seems to have left no impact on his life and spends more time working than with his family. All Might is only connected to Izuku by One For All, but he's been a HUGE influence on his entire life and has completely changed his occupation in order to be there for him. It's easy to see why Izuku might become upset if his dad were to try and waltz back into his life again.

One Arc will feature Class 1A and the League Of Villains In An Enemy Mine

The League has already been shown taking on rival Villains groups like the Eight Precepts and the Meta Liberation Army who get in their way or threaten their interests. Eventually, a villain or villainous group will arise so dangerous, Shigaraki and Deku are left with no other option than to call a truce and work together. It'll even have Shigaraki and Deku working together to finish off the lead villain together. Possibly it'll feature other Hero/Villain teamups like Uravity and Toga, or Dabi and Shoto.

With the League having taken over the MLA, this scenario appears less likely for now.

Shigaraki will turn on All For One, but remain a Villain

Related to the above WMG, one excellent possibility would be if this villain is a resurgent All For One, whom Shigaraki turns against upon learning he was only All For One's pawn, or possibly the revelation the All For One is really responsible for his family's death (which this Troper is finding increasingly likely to be true). The reveal will shock Tomura to his core, but while he'll turn against his former "Sensei" he'll still ultimately stick to his guns about "destroying everything." Instead, he'll give the heroes a helping hand taking All For One out of the picture... and kill him when they've beaten him, rather than letting them ship him back to Tartarus.

There will be a massive cover-up of the battle between League of Villains and Meta Liberation Army

With Gigantomachia also coming into the picture, the city of Deika will suffer massive damage, on top of all the bodies left behind by the battle. Due to its isolated position and the initial cover-up by the MLA itself, rescue efforts will take time to come and, upon learning what caused such level of death and destruction, the Japanese government and police will decide to cover the disaster as a catastrophic earthquake. They would be rightfully afraid that telling the public of both the LOV having become a greater menace than before, and of a massive conspiracy that had been brewing for years and involved dozens of thousands of people including some very notable VIPs and several Pro Heroes, would cause mass panic and paranoia. However, pieces of info will start to slip theough, be them pieces of recordings from cameras around Deika and testimonies from survivors (like the few inhabitants that weren't with the MLA), causing further public distrust in both the Government and Heroes.

Partially confirmed: there has been a cover-up by the MLA but the government knows at least something due to Hawks having infiltrated the newly-formed PLF.

The MLA will survive in a reduced state

As of Gigantomachia's arrival in the city of Deika, one of their top members (Curious) is dead and their leader (Re-Destro) may be within some chapters. Skeptic and Trumpet look poised to have personal fights against Twice and Spinner but may decide to call it off and survive for now; there's also Geten, arguably the most powerful top member after Re-Destro, currently fighting Dabi, who may decide to retreat. Either way the MLA will be decapitated, its existence exposed at least to the autorities (the above WMG may still apply) and forced underground. Under the leadership of Geten, who appears to have quite extreme social darwinist views and is apparently close to Re-Destro - the latter recalled how Geten developed an upgrade to his quirk just because he saw Re-Destro accidentally burning himself - they will reorganize into an even more fanatical cult.

Jossed. Destro has survived, albeit crippled, and has handed the Army over to Shigaraki.

We will witness a fall of Hero society, and possibly of the Japanese government in general

At the end of the Meta Liberation Army arc not only Shigaraki has obtained a power-up that makes him a walking disaster alone, Twice has become a literal One Man Army, Toga may become even more insidious with her new ability to copy not only appearances but also quirks, Re-Destro and the Army have submitted to him (which brings in a lot of agents, money, technology and connections), Gigantomachia has accepted him and the Doctor is brewing more powerful Nomu. So, it's just a matter of when Shigaraki will decide to strike with such formidable force, crushing the Heroes and taking over Japan, plunging the country into chaos and despair as the Symbol of Fear All For One cultivated. Surviving heroes, including the 1-A kids, will be forced into hiding, reorganizing to get stronger and eventually take back Japan piece by piece.

If the above scenario happens, Eri will become sort of a messianic figure

Her quirk, if used correctly, may heal and restore anyone who's been left gravely injured if not crippled during the devastating attack of the villains. Of course, she will be very reluctant on the idea of using it at first, but she will eventually encouraged and manage to get at least enough control of it. Word of a "miracle child" will spread, making her a target of the Villains but also a symbol of hope for everyone else.

Todoroki will have to face Dabi and Geten together

Unless they squabble and try to kill each other, those two would be a lethal team-up against Shoto: he wouldn't be able to use his ice because it'd be just ammunition for Geten, therefore he'd be left with his fire, which is currentyl weaker than Dabi's. The duo may even be capable of taking on both Shoto and Endeavor at the same time, and even more drama would ensue if it was finally revealed whether Dabi is really Touya Todoroki.

A theory on how Todoroki wins that battle: Endeavor's primary goal in combining his and Rei's Quirks was to create a child who could use his own Hellfire to it's maximum potential without overheating, something he could never manage; thus, with Shoto's ice ruled out as an option, he'll be left with no other choice than to exactly what Endeavor had been training him to do all those years, and turn his fire up to a degree higher than Endeavor or even Dabi could ever manage, while using his mother's ice to regulate the heat, overwhelming both villains.

There's going to be a War Arc

With Shigaraki now commanding sufficient forces to go toe-to-toe with Hero Society itself, this is practically a given. As for specifics:
- Dr. "Ujiko" will create more High-End Nomu. Specifically ten of them, one for each of the Top 10 Heroes to fight one on one. Each Hero will get a High-End custom made to take each of them down.
- UA will be attacked by Shigaraki's Lieutenants and their teams, forcing 1A and 1B to fight them off in a Call-Back to the Training Camp Arc, allowing both sides to show off their growth, but leveling UA in the process.
- The Vigilantes will make an appearance, as something that big would naturally draw in everyone capable of fighting, legal status be damned.

Izuku will somehow acquire both One For All and All For One

Considering tht the quirks have opposite effects. He'll be able to selectively give and take quirks to those he deems worthy.

Kotaro Shimura was fostered in an orphanage which belonged to the Doctor

The second Character Book, published in October 2019, has revealed that Doctor Ujiko (or whatever his name is) owns several orphanages and hospitals throghout Japan as a legitimate front. This leads to the chilling implication that many of his test subjects over the years have been kids and boys fostered in his structures, with no families to ask for them if they disappeared, and whom he may have monitored also later in their lives, as many would fail to integrate in society due to stigmas against orphans, and would be good fodder to create the Nomu.

Some time after Nana Shimura's death the Doctor found out that a new kid in one of his orphanages was indeed her son, whom she had given up after her husband was murdered, and told it to the real owner, for whom he acted as a front man - All For One, who from then on monitored Kotaro closely, waiting for the day to mess up with him and his family just to get back at both the previous and current holder of One For All.

This would make Nana's attempt to protect her son even especially tragic, as it'd have backfired even more spectacularly than we already knew, Kotaro's fate sealed the very day she decided to abandon him for his own sake.

Endeavor's house will be the scenario of a dramatic battle

As of chapter 252 Endeavor has concluded that, both for personal and safety reasons, it's better for his family to go and live to another house. As he will remain the sole occupant of the current house, a powerful villain (or more than one) will show up there and attack him. The incident with Ending, who took his son Natsuo hostage, may have even been engineered specifically to drive Endeavor's family away and not have them involved, especially if the supposedly dead Toya Todoroki (believed by most of the fandom to be Dabi until disproved) was behind.

Eri's mother will reappear

We don't know what happened to her after she left Eri by her grandfather. Her return would be intensely traumatic for the child, as she was abandoned and consigned to Overhaul's cruel experiments by her - she'd hardly want to see the woman, and the people protecting Eri would have all reasons to prevent that. The mother, on her hand, would feel tremendous guilt upon learning what Eri went through and sincerely want to remedy. Enter the villains, who would exploit her as a way to get Eri out of UA's protection legally... what about Rikiya Yotsubashi, the esteemed businessman with extra public sympathy points for the recent loss of his legs (aka Re-Destro, who lost the fight against Shigaraki), sponsoring her?

Sort of jossed since Re-Destro has recently been outed as a member of the MLA during the mansion raid. However, it still has potential for a smaller, more character-driven arc. Altelternatively, Eri's mom might be a deadbeat after all and is hiding out to avoid being blamed for putting Eri in such close proximity to Overhaul. It's been more than four months in story time since Eri's rescue and there is no indication that this lady has even attempted to check up on her daughter. Maybe Aizawa helps the police try and track her down to formally charge her with child abandonment/endangerment. After all, she did leave a little girl with an unstable, reality-warping quirk to the Yakuza seemingly without facing any consequences. The climax of the arc would likely feature Eri Calling the Old Man Out by telling her mom that she isn't cursed and that UA is her real family now.
- To be fair, Eri's mom was traumatized by Eri's first quirk manifestation. It's very likely that by cursed she didn't mean evil or a monster, but rather that there was something wrong with Eri and she does have a point considering how dangerous the quirk is. The mother might not even be alive anymore and if she is she probably didn't try to reach to Eri because she feels ashamed of herself.

Eraser Head, Present Mic and Midnight will have a dramatic fight with Kurogiri

If Kurogiri is not just someone with a quirk created from Shirakumo's body but Shirakumo himself, it's going to be even harder on them, and the worst if he didn't suffer amnesia or brainwashing but underwent a voluntary Face–Heel Turn. Either way, their confrontation will be a Tear Jerker with constant parallels to their younger years.

Alternately, Kurogiri will get a role similar to Bucky Barnes, his old friends protecting him

Kurogiri will start recovering memories of his previous life as Oboro Shirakumo, suffering an identity crisis and terrible pains as he'll fight with years of brainwashing and mental conditioning, and the realization of his acts as a villain and generally having lived a lie for a decade and a half. Convinced that he can be redeemed Eraser, with possibly Mic and Midnight along, will go as far as freeing him and risking being branded a villain himself, while also facing the risk of Shirakumo relapsing into the Kurogiri persona.

One arc will focus more on psychological horror

One current theme in the series is that things aren't black and white. There are well intentioned villains, villains who became evil due to trauma, heroes that are not morally good, the ones who are geniuenly nice have their flaws (nobody is perfect after all) and people in between. The manga has already psychological horror elements, but they are relatively few and the scary stuff is mostly physical violence and body horror. Themes like madness, morality and the fear of the unknown might be explored more in the future. For example, a hero might be (partially) at fault for making a villain becoming evil and the psychology of said hero might be explored. Another example might be a character being in denial about a traumatic event.

It's also very likely to get into Mind Screw territory to the point where you will ask the question "What Do You Mean, It Wasn't Made on Drugs?".

Eri’s Quirk potentiality flaring up again in Chapter 256 will spark Aizawa to try to use her to rewind the now comatose Kurogiri into Shirakumo.

The timing here cannot be coincidental. While this would seem contrary to Aizawa’s rational, rule-bound nature, he’s hurting so much after The Reveal of Kurogiri’s nature that he’ll do something extremely rash.

In chapter 257 we are told he's starting training Eri soon; it's to see where this will lead.

A clone of Twice will get an Heel–Face Turn

He will end up separated from the rest of his group and mildly injured (just not enough to destroy him), also losing the mask, and will be saved by heroes, initially not even aware of who he is. At first tempted to flee or even to off himself, he'll be eventually won over by the heroes and start helping them, gradually growing quite different from the original Twice, whose split personality problems will however grow even worse once he learns of the "traitorous" clone. One of the series' endgame fights may even be a Twice VS Twice.

Toshinori will gain OFA again

Probably with Eri's help.

There will be a Rescue Deku Arc

Deku will be held captive in the future and his friends and possibly other heroes as well are going to go on a quest to save him.

Bakugo will lose his Quirk to one of the Quirk destroying bullets

Maybe as soon as the current story arc as he is involved with the fight against Shigaraki. When thing go south for Shigaraki he might resort to using the bullets, maybe intending to destroy OFA, but instead hitting Bakugo. Which will result in a role reversal of Midoriya and him, finally teaching him some humility.This could also further Eri's arc as she learns to restore Bakugo's and Mirio's quirk.

As of Chapter 281, Shigaraki is ready to use two of those bullets...

Inko Midoriya will suffer an heart attack

After the mall incident she said she didn't know how much heart could hold; we didn't get to see her reaction to the state Izuku reduced himself during the villain attack at the training camp, but for a while she wanted to pull him out of UA; she likely wasn't informed at all about the events of the Overhaul arc. As of the Meta Liberation War arc she, just like any other parent of the UA students, isn't informed her son is participating in an operation whose stakes have become much bigger. It's however likely that as a TV helicopter is now transmitting from the destroyed city of Jaku, she will get to recognize Izuku there only to get struck by terrible chest pain soon after. In the aftermath Izuku will seriously consider quitting and giving One For All to someone else but, in an inversion of what happened after the Kamino arc, Inko will press him to go on, realizing that what he fights for now is much more important than just herself.

The Heroes will admit that society is too reliant on them and will try to change it

They will realise that Shigaraki is right about society relying too much on heroes and will try to change it for the better. Maybe Shigaraki will pull a Heel–Face Turn.

Bakugo will have to die.

Given that he is The Ace student who has fought Midoriya twice and came out on top both times (although, the first ended with Midoriya technically winning) and how he is often the most talented student of the class, he will probably have to die so that Midoriya becomes the greatest hero as already revealed in the beginning. Heck, he already took Shigaraki's attack to protect Midoriya and is critically injured in chapter 285, meaning it is possible he'll be down for the count.

All Might will regain all his physical power, but he will become mentally broken

He will regain OFA and his former powerful form, but a future event and/or revelation will traumatize him emotionally so bad that his mental state will deteriorate. This will be a testament on how physical power isn't everything.

Sir Nighteye's prediction regarding All Might will be fulfilled, but All Might won't die

Let me explain this theory. Nighteye misinterpreted his prediction. The prediction wasn't really about All Might dying. Sir Nighteye's powers doesn't limit to just real events, it can also show what people can imagine. What Sir Nighteye saw wasn't really All Might dying, it was All Might imagining/having a hallucination that he himself dies. Alternatively, what Sir Nighteye saw will happen in reality, but it's not what it looks like. However, this doesn't mean All Might is safe. There is still the possibility of him dying or getting physical or mental damage.

The series will deconstruct the typical shonen power-up

The series already deconstructs a lot of common shonen tropes. One trope that people are tired of is the never ending power-up that appears. The consept of power-up is cool and with a lot of potential, however if used to much it gets boring and even ridiculous. For now the characters are getting immense amount of powers and it might seem to some that the series will fall into the same trap, but it won't. It will continue using immense power-ups, but instead of just using them for the conflict between heroes and villains, it will show the flaws of this concept (In-Universe flaws, not the fact that it's boring for the readers/audience). For example a hero who becomes insanely powerful might suffer a Sanity Slippage and end up being destructive and the other heroes will struggle to stop them.

Stain will return in some form or capacity.

With the Tartarus prison break having happened, and Stain having been locked up there, there's a chance he may return based on the following:

- His speed is on par with Muscular and Moonfish, who've been confirmed to have escaped.- Characters who've sat out before like Mirio and Best Jeanist returned during the PLF War arc, so it's safe to assume another important character like him could come back. And with Overhaul also escaping...- He's clearly not been forgotten about, as early in the PLF War arc, a meeting with him that was going to involve All Might got delayed.- He's VERY important to the League of Villain's growth as a whole, as some of their more prominent members like Dabi and Toga joined through his ideals.

As for what he's going to do, no clue if he's going to be a minor villain, or an ally to the heroes (albeit begrudgingly). But a full-blown redemption arc would seem ridiculous, as he's got a kill count of 17.

1-A will form their own Hero Agency.

They have been put through the fire time and again together, and formed a real and powerful True Companions bond. Not only does their wide range of Quirks grant a great deal of flexibility, but no less a personage than All Might has pointed out that two of the most powerful members, Midoriya and Bakugo, complement and improve each other (not to mention Midoriya's Warrior Therapist shtick pulling Todoroki out of his issues more than once). The revelation that they should stick together in the changed hero society will all fall together when Midoriya and the class graduates.

Toga will inflitrate UA as a first year srudent

With the new school year at UA starting soon and Toga's whereabouts unknown by anybody, it represents a good opportunity for her to infiltrate UA. Specifically, she may kidnap a first year set to go into UA and hold them hostage in her hideout, going back every so often to take their blood so she can stay transformed. And since she can now use the quirks of people she's transformed into, this drastically extends the amount of time she could pull off such a charade too. SO, if there are any new "cute, quirky" first year girls that seem overly interested in being Uraraka's friend or trying to figure out where the hero "Deku" went (if I were Toga, my cover story as this would be "I'm just curious about him because I saw him in the sports festival last year), this girl may be Toga in disguise again.

Bakugo and Amajiki will fight side by side against a Main Antagonist from some major arc future.

Many consider that Izuku, Bakugo, and Shoto what U.A.'s next Big Three. and since Izuku and Shoto have already interacted and fought side by side along with a member of The Big Three against some antagonist in a long and important arc (Izuku along with Mirio against Chisaki during the Shie Hassaikai Arc and Shto along with Nejire against Shigaraki in Paranormal Liberation War Arc), it is suspected that Bakugo and Amajiki will interact and fight side by side against some major antagonist in a major long arc of the manga.

His primary character trait is his jealousy and bitterness towards Class 1-A, which is not very conducive to heroism, and Tetsutetsu believes that the rest of the class would've become as bad as him if not for Kendo. And as the Joint Training Arc shows, they could definitely make for a credible threat.

Not likely as while he has that attitude and likes to compete against them, has no villainous intentions. If anything he has hopes of actually becoming an Ensemble Dark Horse.

There will be a villain who was a former U.A. student who got expelled by Aizawa.

Considering how many students that he expelled (including an entire class, which obviously would include recommended students), it would be only a matter of time until one of them return to seek vengeance against Aizawa.

Jossed, apparently he doesn't actually expel them.

Overhaul will return.

At the end of the Internship Arc, he's still alive, if armless and thus unable to use his Quirk. Law of Conservation of Detail means that you don't have a villain survive when they could reasonably die unless you have future plans. They haven't said what the state of prosthetic in the setting is, but he would presumably have something. Some permutations:

Demoted to Dragon: Or possibly a lower underling. Overhaul was a pretty capable scientist, and other villains may want to capitalize on that. He might voluntarily work with somebody gunning for the heroes for revenge, or might be forced to work with someone he doesn't like.
Weak, but Ambitious: Overhaul goes after the heroes by himself, or with more people he's manipulated into being his minions. Either out for revenge, or hoping to get Eri back so he can force her to rewind him to back when he still had his arms. Possibly ends with Eri standing up to him herself.
Enemy Mine: Probably the least likely. The heroes end up working with Overhaul, most likely against a mutual enemy, like the League of Villains or the Quirk liberation army. Might involve restoring his arms, if Eri ever learns to control her powers and the heroes having some kind of contingency plan for if (when) he betrays them. A sign that the Godzilla Threshold has been crossed.
As one of All For One's new henchmen, convinced into it by the offer of getting a new, better, second quirk that doesn't require touch to activate, in exchange for helping AFO escape Tartarus in a prisonbreak arc. Additionally, All For One might end up backstabbing Overhaul and convert him into a semi-sentient second version of High-End with less quirks than the regular ones, in order to prevent a Quirk Overload from breaking Overhaul too badly for use. Either the new Overhaul Nomu is used as a distraction in order to ensure AFO escapes the heroes, or he (together with his loyal disposables) gets reassigned into joining the league of villains, with his still sane followers (Chronos and Nemoto foremost) accepting the offer to join the LOV in hope that they can get Eri back and undo the nomu-transformation AFO forced upon Overhaul in order to make an obedient pawn of him. From there, main focus will be on the characterization of the disposables, while Overhaul himself remain as their motivation and additional muscle to the league.

Tomura Shigaraki will not become the big bad of the series.

Shigaraki, being a Psychopathic Manchild will at some point screw it up so badly that he will die or get crippled so badly that he wouldn't be able to fight before he would succeed to become the ruler of the Underworld. Or he will make such a huge mistake that All For One will no longer want him as a successor.

Alternatively, one of his past mistakes will bite him in the ass. Alternatively alternatively, he would succeed in becoming the ruler of the Underworld, but will fail due to his own actions.

Deku will become a villain.

The story is told from his perspective, so it's possible it's not true, or he did genuinely become a hero after pulling a Heel–Face Turn. Or at least Deku will appear Ambiguously Evil or become an Anti-Hero.

Future saga theories

The saga after 'Rise of the Villains' will focus heavily with espionage and intel-gathering.

Considering that there seems to be a pattern in which whatever trips both the heroes and villains up in the climax of one saga will become the focus of the following saga, it makes sense that due to how much espionage and intel-gathering has played a part in the current arc as of writing this (The Paranormal Liberation War Arc) the following saga will deal with the topic in much the same way that 'Rise of the Villains' dealt with strategy, foresight, leadership and teamwork after those things played key roles in shaping the events of the 'School Trip' and 'Hideout Raid' arcs.

There will be a Time Skip after the battle with Shigaraki, during which time Midoriya's injuries are treated

It's possible that Midoriya will injure himself enough that he doesn't completely lose the use of his arms, but would have to go through rehabilitation to do superhero work again. This would lead to a period of time in which Midoriya is away from the others, and likely in the dark about various goings-on, and he would reunite with his friends and learn what's going on after the Time Skip.

Midoriya, All Might, OFA and AFO theories

Midoriya will be haunted by the Zeroth Torch Bearer

All For One elaborated on the supernatural phenomena when he was haunted by the original wielders of all the quirks stolen or transplanted he currently possessed until relinquishing them. While Deku has had contact with the ghostly vestiges of the eight torch bearers, he has yet to encounter the individual who once had the Stockpiling Quirk, that same power wrongfully stolen by All For One and forcibly implanted into his little brother.

All For One intentionally created the cursed power known as One For All

While he has no understanding of justice, he's also no fool. He never "accidentally" gave his little brother anything. Find it strange that his Quirk is the one where he can steal but also give Quirks to others? His sickly younger brother was truly quirk-less and never had the ability to transfer anything to anyone. AFO desperately wanted him to join his side, but his imprisoned brother would rather starve to death than serve AFO's wicked plans. His health rapidly deteriorating and AFO unable to find another Longevity Quirk, in an act of twisted-love and affection, created OFA to assimilate his little brother with. What he didn't count on, was the Second Torch Bearer escaping with the Quirk, and his brother's soul.

Midoriya will lose OFA by the end of the series

If the aforementioned Quirk to steal other Quirks exists, this would lead to Midoriya losing his powers. This will lead to Midoriya having to rely on his brains to save the world. It would be a Bittersweet Ending where despite losing his Quirk, he would prove that even the Quirkless can become heroes.

Possibly jossed, since it's revealed that due to the origin of One for All, it cannot be forcibly taken away, but it CAN be forcibly given.
He can be shot by the quirk erasing bullets in the final battle...
Or he is forced to give it up to Shiragaki/AFO in exchange for someone being held in ransom by them. (both tomura shigaraki/tenko shimura have *ten* in their name....

If Mirio gets his quirk back, it'll signal that Midoriya will give away/lose OFA

They both have the same birthday, and in someways, Togata is like Red Herring protagonist for Deku, because they operate in a similar space in narrative as 'future #1 hero'. In reality, they take journey's in opposite directions. Midoriya started quirkless and gained OFA, Mirio started with a quirk but ended up quirkless. Internship arc is the first time Togata loses all the hard work he put towards his quirk, and the first time Izuku uses OFA %100 full cowl extensively.

If the narrative continues in these directions for the two- Mirio getting his quirk back would be lampshading for Izuku really giving up/loosing OFA. But this time, If Midoriya tries to give it up, it'll be to someone who has to take it- possibly because the situation requires it, but mostly because, Izuku would have already done all he could with it by then.

Midoriya has to accept that he was, will be, and always has been worthy as a true inheritor of OFA- only then, once he's fully embraced the power as his own does any attempt to pass on OFA narratively make sense. Who the inheritor will be, however, could be anyone (from Tomura to Todoroki).

Midoriya will be the final user of One for All

Due to certain circumstances in the future, Deku will be forced to retain One for All and end up not passing it on to another user, taking the power to the grave:

The whole world finds out that Deku's Quirk is originally All Might's and now a lot of people are actively trying to get the power from him, making it really difficult to find a suitable heir.
One for All has become TOO powerful, to the point where if Midoriya tries to pass it on, his would-be successor would explode to Ludicrous Gibs because his/her body cannot handle the concentrated awesomeness.
Midoriya ends up dying before he can find an heir.
Midoriya will lose one for all before he can pass it on. (either by the quirk erasing bullets/the final battle between Shirigaki/All for One)
- Seems to be leaning to this, as 304 confirms One For All can only truly be used by Quirkless People, which are dwindling.

Midoriya will save All-Might with One for All itself.

To thwart Sir Night Eye's prophecy of doom that All-Might will die a gruesome and heart-wrenching death, Deku will, when his teacher's life is in peril, in a demonstration of admiration, reverence and sacrifice for his beloved idol, transfer One for All straight back to enable Toshinori to fight once again and save himself. All-Might will later in gratitude return the quirk back to his student and protege, Midoriya.

Deku will eventually train with the spirits that reside within One for All.

Deku has seen the outline of spirits which previously held the Quirk. He'll eventually have a Battle in the Center of the Mind with them in order to unlock even more power.

Now consider the fact that his power is passed down from one host to another. It has to start from someone, and that person will hold precious information regarding the power and quirk in general.
And since it passed down for many years, what if the previous host still has their battle experience and memory in general? Not only it will help Deku for his analytical power, he will gain good advantage for history class!
One for All can be passed onto people who already have a Quirk; All Might and Deku are the only past holders who were originally quirkless. It will be revealed that Deku will be able to use the Quirks of the past One For All users (Or at least, the ones who had Quirks).
- The latter one has been confirmed, although for now Deku has unlocked only one power.

Midoriya does have a Quirk! His Quirk is that he can't be harmed by Quirks.

And that Quirk has been conspiring to make sure that no one finds out.
- Alternatively, Deku lacked the trigger to activate his Quirk. And One For All substituted for it.
  - Double alternatively, Midoriya's real Quirk is high-speed situational analysis and nobody noticed because it isn't a very flashy power. It awakened early on in his life but was mistaken for a mere obsession with heroes by those around him. Midoriya gains a working knowledge of environments, objects, and even people after observing them even once and can quickly formulate plans to deal with them. The problem is that he has to observe something (touch it, see it, get hit by it) to gain that knowledge. This means his studies don't benefit his exam scores any more than the average person (information from reading is too far removed from real experience to trigger his quirk) and his kind heart keeps him from putting it to more brutal use against assholes like Bakugo.
More likely he might have a quirk that doesn't manifest by itself, á la Aluminium Gnats from Mistborn, where his power doesn't provide any benefit to him normally unless it is combined with another power. It might overcharge his other quirk (which would explain how he can use the full power of One For All without hulking out) or even completely redefine the other quirk (the representation of the usage of One For All is so different between All Might and Deku (Deku doesn't buff out, All Might doesn't get the glowing lines over the affected body part, only the power-boost is the same, which is pretty generic) that they might as well be completely different powers at a glance).
- Another potential quirk is energy transference similar to his mother. Thus why his signature attack is a LONG-RANGE kinetic blast. He could always "push" things from a distanceñ but wasn't strong enough for it to even register. When amped up with OFA, though, it allows for the attack we see

Deku actually had a natural quirk but had it stolen

The theory is based around the fact that the doctor that told Midoriya he had no quirk looks a lot like All For One's doctor who is seen in one panel. That and one of Bakugo's old friends, the one with wings, is apparently the doctor's grandson, and Horikoshi very heavily hinted that that friend was turned into the flying Nomu that tried to kidnap Deku that was killed by Stain. So, if Midoriya's doctor was also All For One's doctor, it's possible he had strings pulled to let All For One steal Midoriya's quirk before anyone knew he had it.
And its theorized that Midoriya's quirk might have been regeneration, since that is what All For One needed to recover from his massive injuries.
Izuku was called 'quirkless' some time before the five year ago battle...
All for One is known to take any quirk he finds interesting or useful. See Ambiguous Disorder on his character page.

Midoriya is stronger than All-Might, or will be given time

Once he overcomes the control issues he has with "One for All", he'll be more powerful than All-Might ever was. This is because when "One for All" is passed on to someone else (confirmed after vision of previous hosts in chapter 33), a part of the previous host is added to it. With each new host, it has become stronger and stronger. Though this also might mean that Midoriya will only be able to unlock his full potential when All-Might loses all of his powers or dies. This also means that Midoriya's going to have a much harder time learning how to control it, since it's more powerful than All-Might's.

As Gran Torino commented that All Might is more easily accustomed to "One For All", he wouldn't do as much innovation than what Deku can do. Deku power will be vastly superior because of his Determinator mindset (more training), his analytical ability (more innovative application), and tied to a WMG above, use of hero gear, added to "One for All" power.
The fact that One For All gets stronger with each generation could be part of why Deku has so much more trouble handling its power than All Might ever did. All Might failed to account for how much he's improved One For All since receiving it, and how that would put additional strain on his successor's body beyond what he had to deal with when Nana gave it to him.
Add on the reveal of One for All having the previous users' abilities and those being slowly unlocked, Midoriya will eventually have more tools to use than what he had.

Midoriya actually has a hidden quirk

Much like the younger brother of All for One, Deku is not quirk-less but had a well-hidden quirk no one knew about because it is virtually useless by itself. His is the power to boost quirks exponentially. Since Deku inherited no secondary quirk, it couldn't manifest. One for All once it was passed to him is evidently dangerous, so dangerous the recoil breaks bones, tears muscles, it risks not only disfiguring the hero, but blowing off the limbs of the user. All-Might never had to cope with such deadly drawbacks. Deku is boosting the stockpiling quirk to insane levels, where he can speak to the previous seven deceased torch bearers and use their quirks as his own.
- If he does have a hidden quirk, it could actually be ANYTHING that requires another quirk to work. Odds are AFO himself was assumed quirkless until the very first time he stole a quirk, which could have taken well into his teens to discover. The Japanese aren't keen on touching each other a lot. AFO's first quirk could have been taken during cuddles with a girl or something who had an amazing quirk. He could have thought about how much he wanted the quirk and suddenly had it. It was 200 years ago, so the toe joint thing probably didn't even exist.
  - Jossed, One For All can only be safely used by Quirkless people, which the spirits confirm Izuku is.

Midoriya will find out that those that pass on One for All will die

If it gets to that point, a huge Tearjerker is expected. I imagine scenarios like trying to reject the power all together. He may even think to quit being a hero.
If All Might does die, Midoriya will suffer a Heroic BSoD and blame himself for his idol's death.

If Midoriya had not gained All Might's acknowledgement...

He could have become someone like Batman or Owlman. Granted, this is only an idea but given Midoriya's analytic abilities and the mistreatment he endured from people due to being quirk-less, it is certainly possible. Using technology and undergoing intense training, he would have become a "Bad-Ass Normal" hero or villain
- I actually think it would be pretty funny if one day a super-rich Bruce Wayne Expy were to just show up at Midoriya's house one day looking for him. The guy is, naturally, a pro hero that fights exclusively using support gear produced by his company, and he wants to recruit Deku to be his successor/apprentice. Hilarity Ensues as everyone demands to know how he missed that what Deku did during the Sports Festival and a possible rivalry buds between him and All Might.
  - Imagine Batman!Deku falling under the influence of Stain. The Hero-Killer finds a kindred soul, a person whose sense of justice is absolute and who is despondent at the fact that he cannot become a hero. Some training and indoctrination later and the Hero-killer will have a successor more than capable of surpassing him.
- I think the author mentioned that in his first draft, that was the plan with Midoriya... At least the Batman part. All he'd have had was some Capture Tape, and industrial strength Taser (which people without Quirks can own for self-defense) and his wit. All Might was still supposed to show up now and again for "You Can Do It!" moments like the boy scout he is.

The truth about One for All will be revealed to the public

The reactions will vary from between negative backlash and defensive support.
- As for Class A's response to Midoriya, some of his friends will probably be understanding of the situation.
  - On a related note, if the theory that All for One will steal Bakugo's Quirk is true, then this will only exacerbate his disdain for Deku.
  - The exacerbate part seems less likely now, as Bakugo is aware of One for All's true nature thanks to Toshinori and Deku, and wants Deku to train his quirk so they can be real rivals, and in his mind, so he can surpass Deku for real. His disdain has also been slowly dying down too.

There will be a flashback arc or side story that will expand All Might's background

And it will be titled "All Might: The Origin"

All For One will have a Mutual Kill with All Might

Both of the "mentors" die, leaving Shigaraki and Deku to take up the mantle of their predecessors. Alternatively,

All For One manages to kill All Might

And he lives to fight another day while mentoring Shigaraki, which will really motivate Deku to get his act together.

Izuku will come up with new techniques and name them after Japanese cities and prefectures.

Ironically, Sai tama Smash(?) will be a series of rapid-fire kicks.

Midoriya will fight the Shock-Absorption Nomu from USJ

The original battle between it and All Might was a major climactic moment for the USJ arc. It also provided the audience with the biggest example of just how powerful All Might was until the fight with All For One. A great deal has also been made in the aftermath of the Bakugo Rescue arc that Midoriya needs to find his own path towards being a hero rather than just emulating All Might. To that end, facing the first serious opponent we saw All Might battle and defeating him in a completely different way could become the culmination of the development of Midoriya finding his own identity as Deku.

At least one other student knows about OFA

One or some student(s) know that there is something wrong about All Might and/or that there is something going between the number 1 hero and Midoriya (apart from Todoroki and Bakugo). They may even know about All for One and that Midoriya inherited it!Just in class 1-A there are students whose quirks are perfect for stealth and spying. Hagakure (Invisible Girl), Jiro (Earphone Jack) and Tentacle could all have witnessed or heard about it without even trying. So, imagine the possibilities in the whole school ...So, said student might have grasped bribes of conversations between All Might and Nedzu, Recovery Girl or Midoriya. (S)He/they may not know or understand the whole thing and chose to keep quiet about it because they know they shouldn't know, because they don't fully grasp the situation and wouldn't make mistakes or simply because this is none of their business.

All For One has a Grand Theft Me Quirk

He wasn't building Shigaraki as his successor. He was building a new vessel.

As of Chapter 285, he's actually taken over Shigaraki. He does it again when Shigaraki is unconscious in 295 to force his protege to retreat, chilling echoing his earlier “everything is for your sake” quote, but in a somewhat ambiguous sense. He could easily have been referring to either Shigaraki or himself.
Given that AFO is a first-generation Quirk user whose body is A. not necessarily adapting as Quirks become more complex (to the point where the procedure Shigaraki underwent was originally intended for AFO instead), B. living in a body ravaged by his previous confrontations with All Might, and C. primarily defined by his own selfishness and lack of genuinely compassion, this seems terrifyingly plausible and in-character.

All For One is a Grand Theft Me Quirk

When Izuku was brainwashed by Shinsou during their match, the spirits of the past holders were the ones to move his fingers to snap him out of it. If All For One works the same way in that regard then AFO could theoretically hijack anyone he gave his quirk to.

Midoriya has a quirk that lets him analyze others

and it shows itself through his notebooks and skill at figuring out the abilities and quirks of others

Midoriya will end up passing One for All...to Ochaco.

Based on this theory

Except a large amount of that theory reaches for things verging on Fan Wank, overanalyzing scenes that were meant to be taken at face value, and support a self-serving bias. So, I wouldn't take too much stock in it.
- And more importantly :P, her name doesn't fit. The named All For One users to date all have names that connect to the order in which they receive it. All Might has the kanji for 8 in his name, Izuku's name contains "ku" which is an alternate pronunciation for 9, and Nana's name is Nana. But there's no reference to be found for "jū" or "tō" (10) in the name "Ochaco Uraraka".

Midoriya will ruin himself and end up sacrificing OFA and his status as a hero, While Ochako will become the Rescue Hero in his place.

Based on this theory

One for All's origin story is a fabrication

One for All's origin story seems a bit iffy. Even if the original user had the ability to pass on quirks, how did he discover it? It's been shown in the series that quirks have to be discovered by their users, but One for All's ability to be passed on would be near impossible to find. It stands to reason that All for One purposely created One for All, possibly so that it could be refined and later stolen back to be used by him, or whatever successors he may desire.

Given that we see One for All's origin via its first user's memories and it lines up with what All Might said, I'm gonna call this one jossed. Also, One for All cannot be forcibly taken, so it's useless for that purpose.

Midoriya will become crippled and have to pass down one for all.

He would pass unto to someone he thinks is up for it and being the symbol of peace. And then gain robotic limbs, allowing to him be a quirkless hero in the end. Deku, the cyborg hero.

Mirio Togata will become the 'tenth' holder of one for all. And Deku will get creative with another part of One for All's abilities.

...But in addition will show Deku being far more creative than prior cases. With the (as of current) situation as of chapter 157, it's both fairly clear that Night Eye sees Mirio still as the superior between the two, as well as a current 'need' to get him back into fighting capability. And the quickest way Night Eye knows, is to just use One For All on him. In addition, this would fit the current theme going with it, with the characters having the number in their name, Mirio Togata would fit, though in native Japanese instead of Sino.

However, this comes also with some creative use of one for all once again, as Deku instead gives Miro 50% of One for All's power. Before this happens, nobody considers the idea of a 50% transfer, meaning there is in effect both two users of one for all running about. (Which only adds further mass guessing that it will recombine back to 100% if one or the other is made unable to keep going).

The issue with this theory though, is less that of counter-proof, but plot wise escalation. It opens the door to a massive split of power, and more dangerously a return of said power, since by this sort of logic, someone could be given 1% of one for all, then give it back with the 1% and their own quirk, which can just get even more ridiculous if a stockpile similar to All for One is built up and the power is shared back. Toga's disguise quirk becomes far more dangerous as she might steal bits and amounts of One for All, and so on.

Another issue, Mirio refused to take One for All. After Night Eye died, he tells Deku he won't take One for All as it would just put Deku in Mirio's place. So, unless they really can divide the powers and concretely prove it will work, Mirio won't take it.

All for One will never be able to take One for All because of the rather specific power-wording on it.

This one's fairly minor, but it explains why One for All wasn't taken in, for example, the fight with All for One in the past. Simply put, because the power itself is giving others power, it means they can control when it is not given, and thus, counteract the power stealing by not willfully giving it. This can be seen in the rules and guidelines for One for All's bestowing power, where you cannot forcefully take it, but you can forcefully give it. Because it cannot be forcefully taken, it naturally counteracts the power of, well, forcefully taking a power. Either All for One has realized this and either didn't care, or it was too late when they tried it, (probably around 6th or 7th holder) but it may go further if he does not know, and a prior theory of 'harvesting' One for All comes up to be true, only to find the power itself hard locks it out may occur.

Crimson Riot is one of 5 unknown former users of One For All

Crimson Riot is described as a Retro Hero by Kirishima and "Classic", the Man among Men by Midnight, when he chooses his hero name Red Riot in homage to him. The wording "Retro" suggests that Crimson Riot is not a hero of the recent past, potentially being a hero from an earlier bygone era, before the current generation like All Might and Endeavor or the generation before them like Nana Shimura or Gran Torino.
In the few times he's shown he appears to have dark, shadowed or black eyes with glowing irises/pupils a design feature he shares only with All Might.
He does posses a quirk that appears to harden his hair but that doesn't necessarily preclude him from having One For All.
In a Meta sense, he seems to have far too much characterization for what otherwise appears to be a throwaway character. Kirishima didn't "need" a real reason for the name Red Riot, and while the his existence provided Kirishima's character with significant background - such as his admiration, fixation on "manliness", and his desire to change his earlier self - the fact that it goes into far more detail on Crimson Riot's fears and regrets on a past mistake that eventually got him labeled as a "Fearless Hero" see far more significant and fleshed out than simply a character created for the purpose of being the rarely mentioned inspiration for another.
In fact this "Regret of inaction and fear for the life of others over fear for self - even if that fear for self is present" feels almost uniquely All Might-ish/Deku-ish in it's tone.

Maybe the author is just good at exposition...but it feels like there's more here.

Counterpoint: We currently have seen at least silhouettes of all the previous One for All wielders, and Crimson Riot doesn't fit any of them.

All For One is a Quirk Designed to Counteract Quirk Saturation

Think about it. In the HeroAca universe, children inherit one, and usually a combination of both of their parent's quirks, barring the occasional genetic mutation. By that logic, it's likely that quirklessness will be eradicated in a few generations. Furthermore, the more people get together, the more quirks will blend together until eventually everyone's quirks are identical to each other (and they would have an amalgamation of all of them). AFO is a quirk that is meant to be used to counteract that inevitability with its two powers:

1. It can take quirks away. By making people "artificially" quirkless, AFO can slow down the rate of quirks blending together to make stronger and stronger quirks.2. It can give quirks away. If two people are in love, but they have quirk combinations that would be problematic to pass on, AFO can take away the problematic quirks and give them quirks better suited for merging together in order to better aid the production of unique quirks rather than a continued blending of the same quirks over and over through multiple children in a family.

Izuku might, either at the end of the series or in an alternate universe based arc, give One for All to Tenya

The One For All users tend to have number puns in their names, and Tenya. Most likely in a arc ever goes into the hero staple of the alternate timeline.

Midoriya will be willingly given allies' quirks for the final confrontation

its stated quirks can combine when passed along, figuring this out before the final battle with All For One(or Shigaraki after All For One hands his power down to him) his Allys(prime candidates would be the various retired heroes like Iida's brother and Best Jeanist as they cant fight but still possess there quirks) will volunteer there power, letting Midoriya pass One for all to them and then passing it back with there own power added

That takes hours to kick in.
- That wouldn't really matter in any scenario where he could go around to all these heroes and prepare he likely has time to wait a few hours, the time limit would just mean he wouldn't have time to get every power form every hero

Alternatively to the above: Midoriya will defeat All For One by giving him One For All

All For One(or more likely Shigaraki after being given All For One) will prove to much for Deku, no amount of heroic resolve can push him to be strong enough, and with the last of his strength he will punch the villain in the face, doing nothing at first, only for him to reveal his hand is bleeding and they swallowed a bit of his blood, transferring One For All to them, and do to how quirks combine when passed rendering the villain helpless, as any activation of any of there quirks will cause them to explode from the strain

See bit about 'taking hours to be ready'.
- And? that would allow the villain to beat Midoriya but he would still ultimately be rendered helpless once it kicked in,and he cant transfer it away because he doesn't have the quirk till it kicks in.

Midoriya will pass One for All to his child.

If Midoriya survives the final battle without losing his Quirk, and there’s a Distant Finale with Babies Ever After, then he’ll be able to pass on One for All to the next generation. In Izuku’s case, that might mean his son/daughter.

It will be revealed that the "All" brothers had a third sibling

And this third sibling has/had a Quirk called "All for Nothing". (Theory base on this drawing:

https://www.reddit.com/r/BokuNoHeroAcademia/comments/8rmtuk/deku_vs_nemesis_deku_one_for_all_vs_all_for/)

Maybe it could be a counter to the other two like stopping energy from being transferred (he can take a lunch but none of the impact would happen.
This is actually a theory I've had for a while— if All for Nothing exists, they're able to take and give Quirks, but not use them. They're a counterpart to One for All (which can be given and used, but not taken) and All for One (which can take and use, but not give— kind of. My reading of it is that AFO can force Quirks upon someone, but not give them.). They're responsible for constructing the Nomu and giving them a wide variety of Quirks. Hell, they may even be the Doctor who Midoriya saw when he was a kid.

AFO's quirk giving doesn't necessarily always give brain damage to the recipient

Brain damage only occurs if AFO forces the quirk on someone. If they willingly accept it, then it won't cause brain damage. But who AFO gives quirks to (I.E. future Nomu) wouldn't accept quirks from the boss of the person or people who kidnapped them. It would explain why OFA's transfer doesn't cause brain damage if it's made of AFO's quirk giving ability and an energy storing quirk. However, this also means forced OFA transfer (which All Might specifically said is possible) would cause brain damage.

Given talk of giving quirks to people, wanting to give one to Shigaraki, and the creation of One for All, that is fairly confirmed. There is just some point when it causes problems, but what point that is isn't known.

High End is a transformed Muscular

Muscle Augmentation is shared between the two and both share a certain level of Blood Knight...

Jossed. He was a minor thug who participated in pit fights.

One for All's power doesn't enhance muscle strength, it makes the user release energy, and Midoriya could develop new powers because of this.

Instead of becoming superstrong, he transfers energy trough his skin(Hence the damage: his body can't contain the power when it becomes concentrated on a place.) and then releases it in the form of kinetic energy. This can be seen in the tournament arc. In Midoriya vs Todoroki, Midoriya creates a windstorm by flicking his finger, shattering a large block of ice. He'd need to be impossibly strong for this to work, and would do more than just break your finger a little, where he only using muscle power. Instead, he could be transferring the power directly to the wind. Then, he would make the force of the wind stand perpendicular to the ice, so that it doesn't blow in all directions, and transfer the energy from the wind to the ice, breaking it. This could be achieved via telekinesis. Therefore, if he can learn to release controlled amounts of energy like this, he could perform superhuman feats like flight and telekinesis.

High End is Possessed

Its been shown that Nomu are pretty much brain dead due to the process of creating them, but High End retains his intelligence. Not because of something special about him or an advancement in the way they make them, but rather he was a normal Nomu rendered brain dead, only to have someone with a mind swapping or possession quirk take over his body. While the physical damage to the brain is still there, its not perfect, but it allows him to keep some of his intelligence.

A Nomu will be Redeemed

All Nomu but one are shown to be brain dead, and the only intelligent one is both very loyal and now very dead, so it seems impossible, but Eri exists, a person whose quirk is literally to reverse someones body to a previous point. This could lead to her completely restoring Nomus to before they were turned, or go half way, after they were given multiple quirks but before it got to the point they lost there mind. You could have a whole team of Half-Nomu.

The Half-Nomu idea wouldn't work. The reason Nomu are rendered brain dead is because they have multiple quirks, something their brains are incapable of processing due to not having the mental capacity for multiple distinct quirks. Eri's quirk reverts biomatter back to a point in time, so if she tried to use it on the Nomu, the only way they wouldn't be brain dead would be if they were reverted to the point before they received their additional quirks, as that would be when their brains were operational.
Eri's quirk also isn't something that can be relied on. She has no control over it whatsoever, and the few times she willingly used it, to help Deku fight Overhaul and then separate Overhaul from his Precepts, they were purely random outcomes. It was said the only reason Deku didn't vanish out of existence is because he repeatedly broke his body so that Eri would have to continually revert it, and that the two only escaped this vicious cycle because Aizawa managed to erase their quirks simultaneously. Even after, Eri using her quirk left her in critical condition due to a horrible fever, and after waking up, the horn that dictates her quirks power had noticeably shrunken, implying its not as strong anymore. Although the horn is slightly growing again, it would still take time, and unless Aizawa is around to immediately shut her quirk off, it could be catastrophic.
More intelligent Nomu called High-End's have been created and with increased intelligence come the capacity to rebel especially if they remember what's been done to them.
- Well, Naomasa and Gran Torino are trying to invoke this with Kurogiri, but time will tell whether or not they succeed.

All Might considered giving OFA to Melissa at some point.

He's apparently close enough to be her Honorary Uncle, and she implies she was upset when she was younger due to being Quirkless. All Might dropped the idea after Melissa became adjusted to the idea of being a scientist.

Midoriya did have a quirk, but not the any of the previously theorized ones.

His analytical ability impresses most people around him, including pro heroes like All Might and Gran Torino. It's exceptionally unlikely that he's the first person to think to make up for a weak, difficult to control, or non-existent quirk through study, and only slightly less unlikely that he's the first to have so much success with it.

What is less unlikely is that he has a difficult to see quirk giving him enhanced analytical ability - faster, more precise, more accurate.

Being formerly Quirkless is basically how All Might was able to defeat All for One when the others weren't

The past users were likely overly fond of using their original quirks, not putting their focus into One for All. All Might in contrast only had that (and his sheer determination towards being a hero), thus he was able to focus on what he knew was there and brought out a great deal of its potential power. Also All for One might have been able to read the past users due to their original quirk usage, but was rather unprepared for focused usage of One for All.

Midoriya is dead in the "Present"

The narrative is basically Midoriya telling his origin story. It may well be that our narrator isn't Midoriya himself but the Vestige he will leave in One For All.

Identity of the two silhouetted One-For-All users

One of the hidden users was a notorious vigilante similar to Stain and is very widely known, while the other was a relative to one of Midoriya's schoolmates and he'll learn of their existence when he starts manifesting a quirk very similar to one of them.

All Might will die of natural causes

It's clear that even without the strains of using One For All, his health conditions have remained quite precarious and it will increasingly show. At one point, the villains will decide to kidnap or kill him, but he will be saved. After all the tension and eventual celebration, things will go back to some peace and, while just walking and conversing with Deku, All Might will suddenly collapse and die in Deku's arms because of a "simple" heart attack; while Nighteye's foreseeing of a gruesome death had been indeed prevented, it didn't mean there would be no untimely death at all.A devastated Deku, and not only him, will blame it on the villains who made All Might fight until ruining his body, but Recovery Girl and others will explain it was just All Might's own will to keep going and helping while he still could. Nezu will also reminisce about when he offered him to resign from UA after the fight against All For One; All Might could have retired in some peaceful abode and just leave all to the next generation but chose not to. Realizing that, Deku will come out of the pain of losing his mentor and friend even stronger.

Destro had One for All

Every OFA bearer had a kanji related to their position in their name, Destro's real name has the kanji for 4. He was a promising young man with strong opinions about society and ended up radicalizing his beliefs and attempting a coup against the Japanese government. He really believed in his cause but there was also the fact that All for One basically WAS the government back then. After his failure, he knew he would face life imprisonment and All for One would have access to him and gave OFA away for fear of being brainwashed until he accepted to give OFA to AFO. He wrote his manifest and killed himself in prison to protect the identity of his chosen successor.

Problem is, Destro doesn't resemble either of the mystery silhouettes. So unless he had a spiky-hair phase, it probably wasn't him. Would make a great fanfic idea though...
Jossed; the fourth user is the guy with the scarf and the facial scars.

Midoriya will eventually manifest a precursor Quirk to Shigaraki's Decay

We already know that Nana Shimura was both a previous holder of OFA and Shigaraki's grandmother. It's unknown if either of Shigaraki's parents had a Decay quirk, but if they had expected him to manifest it on such a powerful level they might have been better prepared for it. But we've also seen with Todoroki and Bakugo that children can inherit a combination of their parents' quirks, possibly with a more powerful combined result. Therefore, it's not impossible that up to one half of Decay was inherited from Nana Shimura. And given that Midoriya is beginning to manifest the quirks of his predecessors through One For All, he might begin manifesting that component quirk. This would also serve to further the ways that Shigaraki is being played up as an evil counterpart to Midoriya.

Seems to be jossed for now: Nana's quirk has been revealed to be Float, on top of Tomura's quirk having been a mutation (just like Eri)... Unless you want to follow the theory it was discreetly put into him by All For One.

Guesses regarding Midoriya's extra quirks, as well as OFA's effects on them

There's a lot of potential ground to cover here so while I'll start with my own guesses, everyone go ahead and add yours too.

Blackwhip has already been established.
Nana's Quirk has been established to be 'Float', and to allow levitation.
A boosting/inspiration quirk, similar to Trumpet's "Incite" or La Brava's "Love." Coupled with OFA's power boost, it will effectively act as a much weaker, temporary, more manageable version of OFA for his allies to use. This ties in with the idea of hero teams over solo heroes that the story seems to be building towards. Bonus points if this is how Uraraka and/or Iida learn of OFA.
An empathy quirk, boosted by OFA into full telepathy. Midoriya will have to deal with some serious power incontinence and get overwhelmed by people's thoughts when it first manifests, but mastering it will strengthen his connection to the vestiges and make learning from them easier, even if it doesn't make unlocking the bonus quirks themselves happen any faster.
A quirk that provides some kind of enhanced senses, like radar, super-vision, or a spider-sense. Beyond helping in combat, this could make it easier to locate and respond to crime or danger. Might be the same thing as the telepathy.
- Confirmed! He has Danger Sense, letting him detect danger, but boosted to headache inducing levels.
A water projection quirk. He will be able to use it very similarly to how he punches the air, but will be able to use it at a higher level without damaging himself since it isn't as closely tied to the force he is exerting. He might also use powerful water jets as a sort of Not Quite Flight to augment his Shoot Style.
A "joke" quirk, belonging to a user that was chosen more as a emergency option rather than a thought-out choice of succession. One who had to resort to actual physical edges in a fight rather than quirk-based ones due to the weakness of the quirk during their time and lack of creativity in how to use it. Midoriya however, will figure out how even a "joke" can be of used effectively (together with the boost of OFA added to it) and keep it as a "joker" in his deck of powers for emergency situations.
A monstrous transformation type quirk, for it's original wielder it was just something that only changed them somewhat for a mild power boost but under OFAs influence it becomes more akin to a werewolf transformation. Giving him greater power plus a more bestial appearance but also making him aggressive and animalistic, forcing him to learn how to control these instincts.

At some point, Izuku will lose an arm

While, as of the Joint Training arc, he's progressing at a steady pace and even starting to reveal additional quirks from the previous holders of One For All, he still cannot use his full power, lest he destroys his body beyond any possibility of healing. However, with the immense power the League of Villains have gained in their dedicated arc, the game will be up many steps and, during a particularly brutal battle with many lives at risk, Izuku will find no other solution than using OFA much beyond his previous limit. He'll win but will be left with a devastated arm unable to move again, if he doesn't lose the limb outright. No amount of prostheses or support items will be able to substitute for such crippling injury. As he will resolve to pass One For All (probably to Mirio or Katsuki), he will find himself unable to help during another battle; however, Eri will spontaneously come to help him and manage to control her quirk enough to restore his arm.

All For One is actually selfless

Or less selfish than he seems. He originally used the phrase All For One as anything for his brother, but didn't tell him that, because his brother wouldn't have accepted it. Furthermore, the (main) reason he became hungry for power was so that he could protect his brother. He called himself All For One in order to scare others that he is a selfish bastard, but he himself still thought of the phrase as anything for his brother.

Or he told his brother what it actually meant, but the latter didn't believe him.

The first time All For One destroyed someone's brain by giving them too many quirks it was an accident

How did All For One find out that peoples'brains get destroyed by giving them too many quirks? Most likely by giving someone too many quirks. To whom would he want to give many quirks? Most likely to someone he wanted to make stronger, maybe even someone he cared about. After discovering his power he was exited to give to a certain someone quirks, but ended up destroying their brain. All For One felt very guilty and it traumatized him. This made him evil, or played a role in that regard or made him worse if he was already evil.

All For One is secretly paranoid

When he was young quirks manifested for the first time. While having supernatural activities happening is scary enough in it itself there is also the fact that society collapsed. It was also stated that his younger brother was sickly, which had the older one worry for his health. His little brother was also the only family member he had left, so their parents died, abandoned them or they left the parents. If the theory about All For One destroying someone's brain by accident the first time, this really drove him into taking extreme measures to avoid danger. Him stealing the age regression quirk came because he fears death and getting old. He was happy that some of his followers killed a group of people who disobeyed him, because his people are faithful to him and he has a hard time trusting people because of his paranoia. If the theory of him actually being selfless is true, then he also has abandonment issues considering his brother left him. All For One is evil out of fear and not malevolence. He doesn't hate people as much as he lets on and knows not every single person on earth will be after him, but he has a twisted belief that he has to be the worst villain in order to keep society under control by fear and keep himself safe. All Might's view of a world where anybody can smile only upsets him, because he has a twisted view that he has to terrorize others in order to keep himself safe.

In addition, he will not be defeated by fighting, but by talking. All For One is an intellectual who really likes power and sees knowledge as power, so gaining information is important to him. Because of this, he will be willing to listen to what his opponents have to say. He is also a firm believer that accepting your mistakes is power and not accepting them is a weakness. He would also notice that he isn't feeling safe and happy inspite of his efforts, so he might consider a different way. If his opponent (most likely Izuku) proves to him that he should and can accept danger as a part of life and that life will someday end and to focus more on living the moment, while still making plans for the future and avoiding dangers, he will be redeemed, will surrender, fix the mistakes he can fix and pay for his crimes.

Stain will use his quirk on All For One

Stain holds the belief that villains should be killed, so he would want to kill the worst of them. It was stated on All For One's profile that his blood type is B, the type on which Stain's quirk resist the longest so...

Midoriya will develop All for One the quirk

Either through a Dad for One situation or All for One's quirk being inadvertently stockpiled in One for All. After all, the previous wielders told him that he will complete One for All. And the complete quote the quirks are named for is "All for one and one for all."

Eri will restore All Might to peak condition, resulting in him joining the battle against Shigaraki and dying

Chapter 276 shows Eri sitting with All Might, and the last time she was seen before the Time Skip, she complained about her horn acting up, a plot thread that wasn't immediately followed up on. It's possible that somehow, her Quirk will activate, reversing All Might's injuries and the loss of his Quirk and enabling him to join the fight. He'll then fight and die in the battle, confirming Nighteye's prediction.

Shigaraki will get shot with a Quirk-destroying bullet and lose all his powers

Shigaraki makes note of how the bullets survived his awakening, even if he doesn't seem interested in using them himself. It's possible that they'll be used against him, and that the heroes will have to give someone with a gun an opening, while that person shoots Shigaraki with one such bullet.

The reason why AFO tried to take over Shigaraki is because he doesn't trust him.

If a subordinate is doing a good job, why interfere by controlling their minds? If it ain't broken don't fix it. Even if AFO only sees Shigaraki as a puppet, Shigaraki was already on his side, so why try to control his mind? Maybe AFO doesn't want Shigaraki to become more powerful than he is, but with Shigaraki on his side this would ultimately benefit AFO and if he wants to be the most powerful so badly, can't he become more powerful than Shigaraki without controlling his mind? Or wait until he gets out of prison and Shigaraki gets some more power, before trying to take over? AFO can turn people into nomus, which follow every order, why wouldn't AFO have done that long ago, or why isn't he waiting right now until the right moment he could turn Shigaraki into a nomu or control his mind in other ways? My guess is that, deep down AFO is aware of Shigaraki's childish tendencies, and he doesn't want to let him screw things up.

Names of the One for All Torchbearers

Due to the nature of One for All itself, the names of its bearers have been kept secret: for most of the story, the only known ones were Midoriya's and All Might's (Yagi Toshinori), but other names have been shown already:

Shinomori Hikage: Fourth Wielder, his family name contains "shi", or "four".
Banjo Daigoro: Fifth Wielder, his given name contains "go", which sounds like "five".
Shimura Nana: Seventh Wielder, her given name is a possible pronunciation of "seven".
Yagi Toshinori: Eighth Wielder, his family name contains "ya", or "eight".
Midoriya Izuku: Ninth Wielder, his given name contains "ku", a possible pronunciation for "nine".

The remaining names are so far unknown, either partially or completely, but they are likely to follow the pattern:

First Wielder: His family name is Shigaraki, so it should be his name. One likely option could be Ichika, which is a common Japanese name that contains "ichi" or "one".
- Jossed, his name is revealed to be Yoichi.
Second Bearer: Nothing is known about him. If it is his given name, a few possibilities could be Kenji or Ryuuji, with "ji" standing for "two".
Third Bearer: Nothing is known about him. If it is his given name, it could be "Saburou" (where "sabu" would stand for "three").
Sixth Bearer: His family name is En, so it should be his given name. This one is more difficult, but one possibility could be Rokuro, where "roku" would be "six".

Two other torch bearers are still alive

Midoriya states that all the other torchbearers he could clearly see except for Toshinori who was fuzzy. He then state that 2 others were also fuzzy. The fuzziness could indicate that they are alive like Toshinori.
- Jossed, the two other Torchbearers were the second and the third and stated to have died after passing One for All to their successors. Plus, when they show up at the end of the Paranormal Liberation War Arc, they are completely defined, they just look away for some unknown reason that is later revealed to be that they do not share Deku's views on saving everyone.

Post-story theories

Midoriya is telling his story to his successor

The narration clearly takes place in the future, so Midoriya has to be telling it to someone. If One For All is still a secret by the time the series ends, it could be revealed that he has chosen his successor and is telling them his story.

Given the reveal from Chapter 304, it is unlikely that Izuku will manage to pass his Quirk to someone else.

1-A Hero Office

All or some of the students in class 1 A will stay together as a team and open a hero office together. They will create the next most successful hero office. Maybe even the best hero office even seen due to the high level of its heroes and their versatility. They will name it 1-A Hero Office in honor of their high school life and how they met.

The series will conclude in the formation of a Super Team.

It's noted that Super Teams tend to not last long in the setting. But now that All Might's retired, the world realizes just how screwed it is by putting so much stock in the #1 Hero — now that they've lost him, they're scrambling to fill the gap. The solution? The formation of a super team (like the JLA or the Avengers) and making this the new norm (instead of several heroes working independently) in order to better combat things like the League of Villains. This may or may not be composed of UA's freshman class, tying in with the above WMG.

Both Midoriya and Bakugo will 'win' their rivalry, just in different ways.

Both of them will become fully fleshed out heroes (for example Bakugo working through most of his selfishness and anger issues, as is already beginning to be seen in the manga, and Midoriya truly making OFA his own) but will more specifically become the kind of hero they admire in All Might by the end of the story. Bakugo will become the hero who is always victorious, and by pure ranking he will become the Number 1 Hero. However Midoriya will, as the Number 2 Hero, become the new Symbol of Peace who saves people with a smile, the paragon that helps society help itself, thereby becoming the "greatest hero" he introduces himself as at the start of the story.

Pre-story Theories

All Might tried to be a Badass Normal

All Might as Toshinori was Quirkless. So, in order to compete with everyone, he started training and began developing his body, possibly becoming a body builder. Down the line he become friends with the One For All holder at that time, leading him to receive One for All from her.

Partially Confirmed. The previous holder of One for All was All Might's friend and mentor figure.

Shigaraki was born Quirkless, and given his Quirk by All For One

One day, he ran into a strange man who gave him a Quirk. Later, he tried to hug his father, and accidentally killed him. When his grandmother figured out what happened, she went after All For One and was killed.

It's more likely that Shigaraki had a quirk, but All for One took it away and replaced it. It's certainly an interesting coincidence that the grandson of All Might's mentor just happened to be batshit crazy... until you remember that one of the side effects of All for One's Quirk transfer is that it damages the brain of the transfer victim. The Nomu have multiple quirks and are basically brain dead. Shigaraki has one, is a massive man-child, and utterly devoted to "Sensei"...
- Currently Jossed as it's not merely power transfer that fries brains but rather transfering a certain number/quality/mix of them. That and Shigaraki was able to recover to a rather composed, if warped, mindset.
- At the beginning of chapter 235's flashback, we see little Tenko Shimura (aka Shigaraki) accompanied home by a man, apparently just a gentle passersby, who Tenko's mother thanks. We then learn Tenko was 5 and his quirk hadn't manifested yet - it did shortly after. Now what if that man was All For One and he had just given Decay to the kid, the latter not even realizing?

Some of Aizawa's old students became villains

Think about it: You worked your ass off. You passed the written exam. You've passed the physical exam. You persevered and got into the best hero program in the country.And what do you get for your efforts? Expulsion on your first day. Not even being moved to the Gen-Ed department. Flat out expulsion.You'll probably hold one hell of a grudge. Maybe you'll decide to become a hero on your own merits. Maybe you'll give up entirely. But maybe, just maybe, you'll want to get revenge for having your dreams crushed and become what you wanted to take down in the first place.

Or alternatively, Aizawa became this strict because he saw too many students (and old classmates) die shortly after their graduation because they weren't up to the job.
Jossed after the reveal that he expelled... and re-enrolled them immediately.

Kurogiri was involved with Yuuei's security breach three years ago.

Chapter 12, a background character mentions that the last time Yuuei's security was breached was three years ago. Kurogiri's Warp Gate seems like an ideal ability for infiltration.

Venomous Chainsaw was made into a Nomu

The Nomu that was used during the School Trip arc had a Chainsaw Quirk. Since Venomous Chainsaw was never mentioned among the League of Villains, it's possible that he was an independent villain, or did used to be part of the team but betrayed them at some point.

I personally think that VC is in prison, and that if and when the Villain Alliance is finally captured, what follows is a prison break arc that results in both VC and Stain being freed.

AFO created quirks

AFO is very ancient, and is heavily implied to be around for the origin of quirks. AFO is also very intelligent. Him figuring out a way to give humans superpowers is not out of the question. In order to not seem suspicious, he made it a world wide phenomena. AFO gave himself, well, AFO, as being able to pick and choose whatever quirk he wanted from the population of Japan was an exciting prospect. Also, creating your very own custom minions to do your bidding. However, those who are related often ended up manifesting the same quirk due to it being tied to genetics. Thus, why AFO's brother has the ability to pass on quirks.

AFO is evil because of his brother

At first All For One wasn't evil, he was crazy and convinced that he was doing the right thing. He also wanted to solve the problem with his brother peacefully, but the latter refused to. AFO called his brother weak and pathetic, because he lost his patience with him and former locked the latter in a vault due to paranoia. His smile wasn't an evil one, but a forced one. When he told his brother about everything being like in the comics he actually compared himself with the hero or referred to both heroes and villains or no character at all. The fact that his brother kept on calling him a villain and fought and sent others to fight against him for generations made his mental state worse. Some of the other OFA users might've pushed AFO too much themselves as well. They are going to be called out by Deku and it might even result into a fight.

More exactly, the younger brother is a hypocrite/a hero who went too far who either did not see the nuance of the situation or outright lied, which made All For One say that if he's going to be treated like a villain, "Then Let Me Be Evil".
Some evidence for this theory:

We have very little information about AFO, his brother and most of the users. Surely, loss of information is to be expected considering how much time has past, but there are only 9 users in total and we already know the names of 3 of them. How were the names of the other six users and All For One's forgotten? Everything that has vague information is suspicious.
It was established again and again that the world isn't black and white and not all heroes are morally good. Just because the younger brother is fighting against a villain this doesn't make him a good person. The fact that we barely saw anything about him makes everything even more suspicious.
When the users visited Deku during his dream nobody bothered to introduce themselves or tell him what was going on and this is literally the first thing you have to do when you meet someone for the first time. In Japan people give eachother calling cards when they firstly meet someone new, even in informal situations for crying out loud. Was that added to the story to keep tension, due to not knowing their names? Well, firstly, just knowing their names wouldn't have killed much tension if at all; secondly, Deku was staying there missing parts of his body, due to not mastering all the OFA power, why didn't they do something about it? Surely, he wasn't really in danger, but he couldn't have known that, why not take a few minutes to tell the poor, good boy that everything his fine and maybe even try to get his missing body parts back? There's nothing urgent about him knowing the story about AFO and his brother. Remeber when Kota said that if you want to be a hero you should be a good person first?
Notice how vague the information the little brother gives is. Again, he didn't even introduce himself or the others, nor did he made his brother's name known. This is a sign that the names getting lost wasn't just due to time, but he and the other users don't really care about them. Why, telling someone your name isn't an act of arrogance. Not only that, but the first weilder kept on complaining how he'll never forgive his brother, but notice he doesn't actually mention clearly what his brother did. He said AFO manipulated people and some of his subordinates killed a group that didn't join them. What the first wielder didn't say, was what exactly did AFO ask the so called manipulated people to do. He also wasn't specific about that group. Killing is a very serious thing, but if you don't know the clear context of what was going on, you shouldn't judge. It's understandable that he wouldn't mention every piece of information about these things, but someone who cares about justice should give at least one clear example about what AFO did. He also didn't mention if his brother was always like this or not, it's very likely that he used to be good and the younger one was scared of his transformation and chooses to ignore it because of that. If he gives so little information, he very likely is hiding something.
Not only is there a lack of evidence if the first wielder is telling the truth and very little information, but even the given information is suspicious. He complained about his brother asking for favours and using people, but there are people like Stain who cause chaos, but geniuenly believe they are doing good. Yes, AFO is evil now, but this doesn't mean he was back then and didn't have good intentions. From what we've seen he kept his promises and wasn't really mean to his subordinates. The younger one mentioned he disposed of his subordinates, but did he really? The first wielder told two guys that wanted to make a pact with AFO that his brother isn't trustworthy, yet they ignored his warnings. So did AFO truly dispose of his subordinates, or was the disposal that bad? At no point were those guys shown as being unhappy, so it probably wasn't so bad. Not to mention that while they were in tough situations, they should've had second thoughts, so they're not blameless. In fact during the flashback AFO didn't mention wanting to be demon king at all. He said everything is like in the superhero comics, but he wasn't specific. Even if he truly was evil, he did try to make a reputation of a good guy, so wouldn't it have made more sense for him to compare himself with the hero? After his younger brother told him the villain always looses, the other said this isn't true. Plenty of people don't believe the villain always looses and are not evil themselves. AFO locked his brother in a vault for crying out loud, it's very likely he was mentally unstable and possibly not evil.
AFO mentioned his brother being the only family member he had left. Remember when Kota used to be angry at superheroes due to his parents losing their lives as superheroes? He was treated with compassion, yet AFO isn't shown getting any at all from his brother. Not to mention how revolted the younger one was at his brother for apparently using desperate people, but showed absolutely no sympathy when AFO mentioned him being the only family member left. It's qutie possible AFO did what he did back then due to losing the rest of the family. Of course it doesn't justify it, but you can feel sorry for the tragedy in AFO's life and still be angry at his actions. Not to mention that in many cases people get better if they overcome tragedies.
Notice how during the flashback AFO's brother seems to be the one starting to insult the ther one. He most likely started the fight himself, yet AFO kept on trying to find a middle ground, but the other one refused to. What kind of hero doesn't consider solving problems peacefully/finding a middle ground?
While it is heroic to risk your life for others, sometimes it's better not to. As stated, AFO tried to find a middle ground, why would his brother think talking wouldn't solve anything at all? What was the first wielder really thinking about when he refused to eat? Did he think his brother cares about him and will stop so that he will start eating again? If so how come he didn't say he knows there is good in his brother? In fact, AFO himself stated that sinners can change. Lastly, why didn't the younger one lie that he wants to join his brother so that he will be set free and become a double agent in order to stop his brother?

Oji Harima was a Holder of One for All

One of the silhouettes of previous users shown in chapter 193 looks like Oji.

He would act as an Evil Counterpart for Midoriya. He never had All Might to help motivate him, so he grew envious of superheroes. He would create artificial powers in order to render Quirks obsolete. Basically, he'd be like Syndrome.
- Or, tying in to the previous WMG, he'll somehow acquire "All For One" and go nuts stealing Quirks.
- Given the fact that the manga is partly inspired by Naruto, Midoriya will likely sympathize with a quirk-less villain even if he is forced to stop him at all costs (much like how Naruto sympathized with Gaara due to understanding the pain of being alone and unloved).
- Or he/she will used tactic and technology, becoming an evil version of Batman, which Deku's analytical ability already resemble.
- Alternatively, instead of a Quirkless villain, a Quirkless character may serve as Midoriya's third rival after Bakugo and Todoroki, possibly built around the question What If?, instead of accepting All For One, Midoriya decided to train hard and use tech to become a Quirkless hero. Such a rival would probably dislike Quirk-using heroes and think himself better than anyone who uses a "crutch" like a Quirk, coming off as just like Bakugo if he was the one born Quirkless instead of Midoriya.

There is no such thing as "quirkless"

Only All for One victims. Joint thing is just a cover up.

Though it seems unlikely that All For One has been able to get his hands on 20% of the population of earth, which is the percentage of Quirkless people.

There is no such thing as "quirkless" (v2)

People who appear Quirkless just have Quirks that are either useless, like "Can produce offspring with sentient aliens" or neutralize some other limitation the person has, like "Can digest lactose/gluten". Because these Quirks don't have a visibly ability, the user is written off as Quirkless.

The most common Quirk...

Is "Toe Joint", a Mutant Quirk which gives the Quirk's owner a redundant joint in their pinky toe, and has no other effect. ...This makes it identical to being Quirkless, meaning it's impossible to tell whether any "Quirkless" individuals have it or not.

Spinner's Quirk is Regeneration

It would make sense with his reptilian appearance.

Chapter 233 reveals his quirk is "Gecko" which apparently makes him merely capable of sticking on walls. However, real-life geckos also possess regenerative capabilities, so if Spinner possessed such ability, he may be not aware of it yet.

Mirio is lying about his quirk's weaknesses.

Mirio claims that his power comes with some huge downsides: that his lungs can't breathe when phased because air passes right through them, that his eyes are blind while phased because light passes right through them, he can't hear when his ears are phased, and similar downsides. None of this, however, matches with what we've seen.

His first appearance has him as a talking face protruding from a wall and floor, except that would require his lungs and vocal cords be phased, making him unable to speak, and he can hear Midoriya despite his ears being phased into the wall (or he can read lips). Light clearly doesn't pass through him while he's phased, because if that was true phased body parts would be invisible.

That wasn't a Vomit Discretion Shot during the entrance exam. Ochaco really does puke rainbows.

We know that several people have physical mutations that aren't directly related to their quirks. Mina's coloration is confirmed to be a side effect, but that doesn't explain her horns. And Kouji's Quirk allows him to talk to animals but he has a rather odd shaped head in addition to that. Ochaco has something similar but less obvious. Sparkly rainbow-colored puke.

Also, Midoriya and his mother both have super tears.
- Amusingly, the super-tears has actually been confirmed, with Izuku & Inko mentioning that their Ocular Gushers have actually caused property damage.

The requirement that Toga needs to drink a person's blood in order to shapeshift into them is mostly psychosomatic.

Maybe it does something to help power her transformations or maybe it makes her impersonations more accurate, but the victim's clothing is included as part of the transformation, which is information that couldn't be transferred to her by drinking blood. Also, her method of hiding her presence by clearing her mind could very well be an extension of her shapeshifting if it works by turning her into a liquid mass that can hide in the cracks or simply makes her blend into her surroundings. If this is the case, then she doesn't actually need to drink blood to alter her form, even if she believes she does.

Quirks are Nanomachines

that live within the bodies of those with quirk potential and those who already have quirks.

This theory is based purely off of the numerous Star Wars references made by the series. Perhaps the glowing baby acted as a "broadcaster" for the nanomachines, scattering them around in the air or whatever, infecting everyone who breathes them in via entering their bloodstream. Also, note the "lightning bolts" that show up inside (and outside) Deku's blood(?) when he uses One For All; those bolts are probably the nanomachines themselves.

As for why they appear, maybe it's because Deku's body still isn't quite used to having a quirk? He did go through several years without one, after all. It could also be because he's simply going further than beyond his normal limits.

Quirks and personality are innately linked.

To clarify, neither one completely controls the other; characters like Shinsou with his mind control or Midoriya with a quirk that has been likened by Bakugo to All For One who are fully determined to be heroes 'in spite' of their quirks seeming ill-suited for it seem to completely cast aside the idea that there's any such thing as an intrinsically evil quirk. But with the coming of the Meta Liberation Army arc, there seems to be mounting evidence that quirk and personality can at least have a very strong influence on each other. The evidence is as follows: Throughout the story (at least as early as the School Trip arc) it's been mentioned that even non-mutant quirks are still very much a part of their weilder on a biological level. But a person's body and brain and personality are all linked in various ways, even to the point that doctors in the real world are begining to lern more and more about how mental and physical health can both affect each other. Now, from a quirk -> personality angle, Toga's obsession with blood and thinking of bloodlust and love as the same thing all seem to stem from instincts that come from her quirk. Now, as mentioned, that single factor probably isn't enough to make her a villain. If she'd recieved guidance on how to manage her impulses beyond "bottle it up so you can look normal," then she likely would have turned out a much healthier and well-adjusted person. Likewise, while Shigaraki was certainly shaped by his trauma, his obsession with destroying everything seems too closely tied to his quirk for coincidence, especially if AFO's words to Shigaraki about his itch being his body wanting to use his quirk had any grain of truth in them. And on the other hand, we have the idea of Quirk Awakening. So far all we know is that it's possible for quirks to evolve under pressure, but so far every awakening we've seen has been a combination of pressure and rapid character development brought on by that pressure. This was true for Shigaraki, Twice, and supposedly Geten offscreen (especially tre for getten, since his awakening sounds like it was caused more by the stress of Re-Destro having been burned than any immediate threat to himself). Possibly for Toga as well, but it's yet unclear if her love for Uraraka caused an awakening or if she just began using her existing potential to its fullest. That's the information we have so far, so this next bit is speculation based on the theory. AFO takes so many quirks not just because of how powerful it makes him, but because he compulsively steals and hoards quirks as a side effect of his own quirk. This is also part of how he raised Shigaraki; he abandoned himself to his quirk ad let it shape him into a villain, and he led Shigaraki down the same path.

Re-Destro seemingly confirms this.

Quirks have existed since the dawn of humanity

They were just incredibly rare. Their explosion only some generations prior may have been due to the traits that caused their manifestation firsthand, residing into the DNA of most people at that point. Before then, their manifestations were so few and far between they could be easily dismissed, or intentionally covered (for example, the Minotaur was a man with a mutant-type quirk who was segregated), as fiction. They still left their mark on humanity though: gods, legendary heroes, monsters, mythical beasts, psychics, mystics, the concept of supernatural powers itself... all originated from sightings of quirked people through the ages.

The potential for Charles Atlas Superpower is an inherent aspect of the Quirk factor, regardless of the Quirk.

There are several feats of strength, speed, and durability way beyond what a normal human can survive. Gran Torino and Bakugo’s Quirks have enough force backlash to explain why they can take blows from All Might’s without turning into Ludicrous Gibs. But, without Quirks of this type, injuries like what Aizawa receives facing Nomu 1, Endeavor from Hood, or Best Jeanist from the All for One should have ended in body bags: even Uraraka tanked multiple blows from Bakugo that shattered concrete. The same goes for strength when there’s instances of Nighteye flinging around 5 kg seals like darts, Stain slicing through giant ice pillars in a sword swing, or Endeavor sending a Nomu flying with a punch. And that’s before getting to the near-Flash Step abilities that people like Shigaraki and Toga possess.
- The societal treatment of Quirkless is pretty inconsistent with the number of background characters whose Quirks are totally useless. Plus, there are multiple combat-capable heroes, villains, and students whose Quirks offer a slight or easily replicable effect (at best) in direct fights: Mandalay, Spinner, Bubble Girl, Hatsume. The commonly held belief that there was no way someone Quirkless could become a hero implies that people with Quirks have an intrinsic quality that makes hero status out of reach for those without. The simple nature of most of the earlier Quirks might mean the abilities themselves can’t be enough of a boost.
  - Hatsume isn't trying to become a hero. She's trying to become an engineer, which her Quirk would be somewhat useful for. Mandalay's Quirk may not be useful in a dirct fight, but the Pussycats' specialty is search and rescue, where it would be useful.
- One explanation is, so long as a person continues to use their Quirk while training, convincing their body to associate Quirk use with heavy physical activity, the strain may boost the body’s natural boundaries without facing things like muscle restrictions. For someone like Toga or Stain, who have to subdue their victims by direct violence (while also using their Quirk very shortly before or after each of their kills) there would probably be an automatic association between Quirk and physical ability. This implies that someone who uses their Quirk on and off while going through Training from Hell might be able to replicate the influence of backlash-heavy powers, even if they had the power to do something like change colors.
- This might also explain why Midoriya came in last in the Quirk Apprehension Test. Even considering that several of his classmates had Quirks that boosted their physical abilities, there were still people like Kirishima (shown to have started strength training around the same time as Midoriya), Kaminari, and Jiro, all of which would almost definitely have to rely purely on physical ability as well. Midoriya having only used OFA a single time at that point, compared to the hundreds of times of his classmates, may be the reason why he did so much worse despite his year-and-a-half of training and his high ball-throw score.

Sir Nighteye's quirk is like Garnet's future vision from Steven Universe.

Just like in Steven Universe the future is influenced on what actions are taken and just like Garnet he is able to see the future based on the actions that are going to be taken. His vision about the team being killed by Overhaul was the posibility that would have happened if they didn't fight back, but Overhaul did not know that.

Izuku already tapped into Float without knowing it.

During the fight with Overhaul, he was pretty much flying around in the sky. That could just be an application of One For All 100%, but it makes more sense if he was unknowingly tapping into the seventh holder's Quirk.

The reason why weaker or useless quirks exist at all is because when quirks first appeared people with strong or destructive quirks died off very quickly.

All for One and One for All are both quirks that appeared right at the beginning, with All for One being pheonomonally strong. But what about other quirks? Well in the beginning quirk users were a minority, a major minority, so the reaction to them appearing would to the public at large cause a couple of different reactions to people with quirks.

One: They'd be hunted down and killed for being monsters.
Two: They'd kill themselves for being monsters or being different, thinking something along the lines that they were cursed.
Three: They'd get absolutely positively DRUNK on power, doing risky things, gaining the attention of authorities and through concentrated effort be killed. Which would loop back to one because people with quirks would be demonized by the appearance of those who used thier powers poorly.
Four: They'd self destruct because they wouldn't know to expect biological limitations of their quirks. We know that every quirk has a biological limitation like Tremors causing concusions, fire quirks causing someone to overheat, or sight based quirks causing dry eye, but would first generation quirk users know that? Most likely not, they'd likely experiment or exhaust themselves or accidentally kill themselves using their powers.
Five: People with subtle or non offensive quirks, hiding their status as quirk users completely to ignore blowback. This means that these people with the lesser quirks are the basis of modern quirks which is why so many of them seem random, silly, or off the wall, they're mutations of very subtle things coming together.

Ship Theories

Uraraka will eventually return Midoriya's crush, and being as obvious, resulting in a Everyone Can See It situation

Except Iida, despite hanging out with them both the most. Meanwhile, Bakugo will be extremely butthurt that Midoriya managed to make a girl fall in love before him.

Ochaco's Hero mentor at least notices it. So, does Aoyama.
Uraraka has acknowledged that she has a huge crush on Midoriya, but is trying to ignore because she's focusing 100% of her attention on becoming a hero rather than letting herself be distracted by her personal life. Of course, she has no idea that he's also got a crush on her, so who knows how she'd handle it if that came out.

Midoriya will gain a harem.

Midoriya is a Determinator and a Nice Guy, yet Adorkable, some quality that usually help harem MC get the attention of the girls. This romantic subplot will provide Comic Relief from the Dark and Edgy main plot and to remind us that they still High School Student after all. Or Played for Drama as they realize their sexuality and remind us that they still High School Student after all. The most likely candidate for his courting:

Ochaco has Midoriya attention since as early as UA entrance examination, and stay close to him even now. She also has Clingy Jealous Girl quality on her, when Midoriya praised Mei.
Tied to WMG about the hero-gear above, the Gadgeteer Genius Mei. Hero-gear is custom made to conform with the user, so they will inevitably get close for "measurement and adjustment", then one thing led to another...
- Mei actually does begin taking Midoriya's measurements in the story, in front of Ochaco, leading her to snap in jealousy.
Tied with WMG about Tsuyu being an outcast, they will get close mostly on term that they can sympathize with one another, both friendliness to each other, and that both are Adorkable. Fans have noticed, and Rule 34 ensued...
Bakugo would get really angry at Deku that he not only got a girl to like him, but a whole bunch of girls so he would try to ruin the harem by proclaiming that he likes Uraraka and that Deku is a jerk for stealing her from him. Even if he doesn't actually like Ochaco.
Deku and Melissa's interactions in the movie have a certain air of Ship Tease. Born quirkless, admiring All-Might, comparable heroic spirits, they have a lot in common. Her father even says he can "the future is in front of him" when while she is standing with Midoriya. Sure, he meant in the Passing the Torch sense, but he might be considering something else as well. Ochaco even thought they were on a date. And by all indications, the movie is canon.

Himiko Toga has developed a Villainous Crush on Deku

After she was pinned by Ochaco, Toga starts ranting that she and Ochaco are the same; that they both love someone and want to be like someone (Cue Ochaco's recalling how she wanted to be Deku and win during the school tournament arc). Toga goes onto say that she loves people who are beat up and smell like blood. Once Deku, Shoji, Shoto, and Tokoyami arrive, she escapes - but not after she is taken back after looking back at the newly arrived heroes. Then there's a panel of Deku looking beat up after his encounter with a supervillain, which is then followed by a panel of Toga blushing heavily. Deku does seem to have a penchant for sparking interest in villains, after all (Stain, maybe Shigaraki). Perhaps Toga can be interpreted as an Evil Counterpart for both Deku (he adores All Might, she worships Stain) and Ochaco (both like Deku).

Izuku and Ochaco will become an Official Couple by the end of the current arc

Rather than drag the Will They or Won't They? subplot throughout the series, Kohei will avert expectations by having them get together long before the series ends.

The beta couple of this series is going to be Jiro x Kaminari

Since romance is definitely a part of the story, and Midoriya x Uraraka will be the main couple, this troper thinks there will be at least one beta couple to parallel and/or contrast Midoriya and Uraraka's relationship.My guess is that it may be Kaminari x Jiro. Both can be foils of the main pairing in a way:

Ochaco is the cute, easy to talk to, happy-go-lucky, girly girl that may seem fragile but is much stronger, tougher and smarter that you would think at first glance. Whereas Jiro is the cold and sharp at first glance but she appears to be much nicer when you manage to get close to her and is hinted to hide a lot of insecurities and may be much more emotional than she lets show. Both come from a middle-class loving family who is encouraging them as much as they can on the hero business. And both seems to have a really close and strong bond with their fathers. Their physical appearances are opposites with Uraraka having nice curves and fair hair and Jiro being less endowed with dark hair.
Both Midoriya and Kaminari are friendly guys with an important influence on the class. Midoriya is a deconstruction of the chronic hero syndrome. He is kind, shy, all-loving. Many stated that he looks rather plain, and wouldn't expect much from him. Then comes danger and he will show you just how much of a hero he already is. He is also one of the smartest students and will (refreshingly) think things through and come up with a plan more often than not. On the contrary, Kaminari looks confident on the outside with his flirty, cheerful and enthusiastic personality. But on the inside, he not may be not so confident in himself as he almost always starts to freak out whenever danger (or difficulty) shows up. He is not that bright but has better physical aptitudes that Midoriya. Moreover, Midoriya quirk puts his own body in danger while Kaminari's put others (and his mental faculties too). Again, their appearances contrast.

And even the pairings current interactions are very different as Midoriya and Ochaco get along swimmingly while Kaminari and Jiro are often bickering (cue Jiro's rude comments to Kaminari).

The Beta Couple will be Momo and Todoroki

As of the Midterm Exam arc, we know that Todoroki was the only person who voted for Momo, thus making her the class vice president. As she had two votes and voted for herself, it was only Todoroki. This event serves as the catalyst for Todoroki's arc dealing with becoming a better team player and being less of a loner, and also begins to close out Momo's arc dealing with her insecurity about her intelligence. In the Hideout Raid arc, when the others rescue Bakugo, the two of them can be seen running away from the scene holding hands. Momo also apologizes when he fails the Hero License exam. Putting the two of them together would be objectively beneficial to both of their character arcs.

They also have a bit of Ship Tease in one of the drama CDs, where they attend a festival together.

Alternatively, the Beta Couple will be Momo and Jiro.

Primarily because of their Les Yay. Not by accident. Additionally, the two of them seem to be growing closer and closer, and were the first friend each other made at U.A. The fact that Kyouka is enamored by Momo just sort of makes it better, and all of Kyouka's moments feel like she might be into girls. Admittedly still not as strong a case as any of the other guesses, but hey, anything can happen, and given that Tiger exists in that universe, there's a shot of more LGBT characters.

Kirishima and Ashido will become an Official Couple by the end of the series

But there won't be any real focus put on them since they're not major characters. It will just end up being one of those things that kind of happens, with a healthy dose of Ship Tease every once in awhile to build up to it.

Well it's already been established that they've known each other since at least middle school, and they both get along with each other (then again, they get along with pretty much everybody, even Bakugo), so...maybe?

Uraraka will get with Todoroki instead of Midoriya

For no reason other than the fact that Midoriya's parents have the powers of being able to levitate small objects, a weaker version of Uraraka’s Quirk, and breathing fire, a weaker version of part of Todoroki's Quirk.

Uraraka will get over Midoriya

Most of the reasons she gives for liking Midoriya border really close to idealizing him instead of loving him for who he really is, warts and all. Since the qualities she likes about Midoriya are those she herself wants to have as a hero, it’s possible her crush could vanish once she actually achieves that goal. Not to mention, Midoriya’s crush on Uraraka seems to have mysteriously disappeared; the last time he blushed over her was way back at the end of the Stain arc, which—as of this entry—happened about 150 chapters ago. So, it’s entirely likely that Midoriya/Uraraka might be sunk by the end of the series.

Unlikely. She's not necessarily loving a shadow nor does she ignore his flaws like his constant muttering, but she's still shown to harbor a massive crush on him despite getting closer to her ideal version of herself. Plus, with this being a shonen series and Uraraka being the main female lead, typical writing for the demographic dictates either the Main Leads remain single, or they get together. Just ask Naruto and Hinata, Ichigo and Orihime, and Ed and Winry.
- Counterpoint: Hinata wasn't the main heroine of Naruto. Sakura was.
  - Counter Counterpoint: Sakura wasn't the main heroine. Kishimoto has gone on record as saying that while he had called her the main heroine, he later came to regret saying that since she never truly acted like she was, and that he had intended for Naruto and Hinata to always be the Official Couple. It's also worth noting that "heroine" has different connotations in Japanese media than in Western media, since it usually boils to "Main Love Interest", and that Horikoshi has officially stated Uraraka isn't a "heroine", but one of the main "protagonists". Plus, the blushing comment is outdated since he ''has'' blushed around her in the more recent arcs.

Toga has a Villainous Crush on Midoriya but is legitimately in love with Uraraka

In the beginning of this arc, Toga says that she loves both Midoriya and Uraraka. But when she fights Curious, her inner monologue reveals her real thoughts about Uraraka. While Toga developed a crush on Midoriya because she saw him covered in blood (just like her first “crush”), she likes Uraraka because she flat-out thinks Uraraka is amazing, even before she took Uraraka’s blood in the Forest Training Camp arc. She likes how Uraraka is trusted by the people she loves and wants to emulate that, the same way Uraraka wants to emulate Midoriya. So, this is why I think while Toga’s crush on Midoriya is a typical Yandere crush, her crush on Uraraka might actually be something more “genuine.”

Mineta and Tsuyu will become a couple

Bear with me here. Mineta's a despicable Dirty Kid now, but he appears to zig-zag between playing Can't Act Perverted Toward a Love Interest straight, averting it, and inverting it when it comes to Tsuyu—when it comes to playing it straight, when he fantasizes about all the girls in swimsuits he visualizes Tsuyu in an Old-Timey Bathing Suit, when it comes to averting it he's intrigued by the Power Perversion Potential of some of her powers, and when it comes to inverting it she's the only one he's ever actually groped, although both times he did might have been accidents. On Tsuyu's end, she repeatedly bitch-slaps Mineta with her tongue any time he says or does something perverted, which may or may not be her way of kissing him in an effort to put a lid on his lewd comments about other girls, she's his only female friend, and though she retaliated for the two times he groped her she hasn't held any ill will for it long-term. Plus the two hid together in Shoji's spread arms during the cavalry battle, which must have been cramped, but was fine for them because they're the smallest two Class 1-A students. That's the only reason Mineta invited Tsuyu in on his "tank" strategy and Tsuyu agreed to it.

Tamaki and Nejire will become a couple or have stronger Ship Tease

I mean, Nejire is clearly closer to Tamaki than Mirio as the two of them are seen around each other lot. The Ultra Analysis databook says Nejire likes to tease Tamaki, which could be her way of showing affection. In Mirio's flashback when he and Tamki meet Nejire, she's more interested in getting to know Tamaki. During the festival, Tamki looks at her in awe and calls her an innocent fairy. His favorite things are butterflies, which can sometimes be associated with fairies. The anime even has his reaction be the center focus when she wins the pageant. Other media may lean into it as during the Hero Fes 2020 event when Nejire wants to be cuter for a pose, Tamaki says he's already cute enough.

A same-gender couple will be established.

Horikoshi has, by the low standards of typical manga, been rather respectful in his three depictions of transgender/non-binary individuals. Thirteen doesn't seem to fall into the gender binary, and no attempt to sort them into it is made; Tiger is treated as a man by everyone; and Magne, while she does - like many other trans female characters - get the short end of the stick, by being murdered gruesomely and being misgendered, her family in the League of Villains always respects her gender, and she's clearly shown to be important to them all. It wouldn't be surprising if, in addition to this, and Toga Himiko's crushes on both Midoriya and Uraraka, a canonical same-gender relationship.

Traitor theories

Aoyama is the traitor for the League of Villains

During both Villain invasions, he is noticeably absent. After the first Villain Invasion, he badgered Tsuyu to ask him where he was during it, only to say it's a secret. Just a funny moment or Foreshadowing? You be the judge. Another hint was that during the Mid Term Exam Arc, he is shown to be more perceptive than he lets on, pointing out Ochaco's crush on Izuku to help them win their battle against No. 13. This could be a hint he is Obfuscating Stupidity. Third, his Quirk can be really deadly in the wrong hands. Fourth, most of the villains have been an Evil Counterpart to Midoriya in some form (Shigaraki being the successor to All for One to counteract Midoriya being All-Might's, Endeavor's Awesome by Analysis abilities, Stain being a fan of All-Might, and Dabi and Toga's hero worship of Stain mirroring Midoriya's for All-Might). Aoyama's name means "Blue Mountain," and Midoriya was presumably named after Mount Midoriyama. In contrast to Izuku being a Nice Guy and a Shrinking Violet with a sense of humility, Aoyama is a narcissistic Jerkass and an Attention Whore.

Probably Jossed. He was shown to be hiding for most of the training camp invasion, only to (partially) save the day by firing his beam at the villain who had Bakugo and Tokoyami captured. This freed the two, allowing Tokoyami to escape although Bakugo wasn't so lucky.
- While his freeing Tokoyami was of no consequence to Shigaraki's plans (Mr. Compress abducted him along with Bakugo on a whim because he thought Tokoyami also had villain potential), there's literally no way it could've been part of the plan because it pure luck that Dabi caught the marble with Bakugo in it rather than the one with Tokoyami. And if Deku's arms weren't both out of commission (something Aoyama didn't even know about when he fired his laser), his Super Speed would've allowed him to easily take both marbles.
Possibly confirmed? The end of Chapter 167 seems to be going with the direction that Aoyama is the traitor. What with the catch line that Aoyama's true nature will be revealed and him staring with dull eyes at Midoriya at the end of the chapter. Further hint is that among the other students in 1-A, Aoyama is the only one that is rarely seen with anyone else of the class. Even this chapter has Midoriya note that he can't completely understand Aoyama.
This could tie in to the "quirkless Aoyama" theory; that his being a mole is tied to the package his belt came in.
Seemingly jossed as of chapter 168. Aoyama is stalking Midoriya because he has No Social Skills, and he isn't quirkless- he wears his belt at all times to prevent Power Incontinence. He's sympathetic to Midoriya because both have quirks that hurt them when used.

Other candidates for the Traitor

Tsukauchi: It's a popular theory that he's a Villain. For starters, his Mind Reading Quirk would have allowed him to find out the location of the Training Ground. Another connection is that he and Kurogiri are seen wearing the same tie. Either he has a secondary Quirk from either of his parents, or All For One gave him a second Quirk that allows him to cast shadows.
- Was it ever mentioned that Tsukauchi has a mind reading quirk?
  - His Quirk is said to be Human Lie Detector, not mind-reading.
- The theory of him being Kurogiri is Jossed as of Chapter 87.
- And if he were the traitor, you'd think All for One would know for sure that All Might had passed on One for All, instead of having to guess.
Ochaco: It would be completely unexpected. It's seems odd that despite being one of the main characters, she's not taking part in the Bakugo Rescue Operation. She also gave a rather flimsy warning about the rescue affecting Bakugo's pride. Either that, or a really bad case of Skewed Priorities. Maybe her family's finances take a turn for the worst, so in an act of desperation, she accepts a bribe from the League of Villains. During the invasion, she was unfortunate enough to encounter the mentally unstable Toga, but that could have been part of the plan to maintain the illusion that she's on their side.
- Unexpected? Yes. Also unlikely as noted below under the WMG section for her.
Kaminari: Surprisingly the he has a whole lot of evidence for him being the mole. So much that it gets its own WMG section.

One of 1-A is the mole/Spot open for Shinsou

By consequence of leaving a spot open in 1-A when the mole is found out, Shinsou will be transferred to 1-A, since Aizawa taken an interest on him.
- Maybe he'll get moved into class 1-A through circumstances related to the mole's reveal - perhaps he'll use his powers to restrain the mole.

The traitor is Denki Kaminari

This theory has been gaining traction in various places. Among the students, it's really only him and Hagakure who have anything to even suggest that they are the ones who keep giving away information about the class's activities, and the evidence is very much stacked more on his end than hers.
Firstly, in regards to his quirk. He is one of the most powerful members of class 1-A, comparable even to Todoroki, except for his quirk's drawback, which turns him into an idiot. Except, that kind of drawback is pretty easy to fake in a way that can't be detected. It's also a good way to take oneself out of a fight quickly when needed.
Furthermore, it is stated in his character description that he is like the glue that binds the class together. Everyone seems to like him, but despite this and his considerable power he isn't very prominent in the plot. He's often there, but rarely does anything truly meaningful to affect the outcome of whatever's going on.
His quirk also allows him to communicate over radio, but the first time this would have come in handy at USJ he can't, because of jamming. It is presumed that the electric villain present during those events was responsible, however it could just as easily have been Kaminari himself. This would eliminate any chance of the jamming effect being erased by Aizawa. What's more, that electric villain happens to take Kaminari hostage after he appears to overuse his quirk taking out a large number of villains, and yet doesn't kill him despite that impressive display of power, using the dubious excuse of not wanting to kill someone with a similar quirk. However, doing so locked down the other two students in the area from acting and perhaps defeating the villain, which might have revealed the ruse. And, of course, someone whose quirk allows them to communicate over long distances would make an excellent spy.
Then there's the incident at the forest lodge. There are a few panels depicting the students' shared bedrooms the night before the attack. All the girls are accounted for (Hagakure is clearly making a depression on her futon) but one of the boys' beds is conspicuously empty. Several of the boys are not seen in that panel, and Kaminari is one of them. This would be an opening for him to contact the League of Villains with their location. During the attack itself, he just happened to be safely squared away at the lodge, and thus was able to avoid having to do anything.
- This one is probably because of No Export for You, but a Light Novel was released detailing various events involving the characters, one of which focuses on Iida during the night of the attack. Said story has him trying to fix everyone's positions due to them being sprawled across the room, one of whom is Kaminari, also revealing he is shown in the panel, he is just the student with his head buried in pillows and his ass sticking up. For placement between characters, he's between Shoji and Mineta, and below Bakugo. Iida's story says he was asleep, so unless he did it earlier, he didn't contact the VA.
He also has a number of odd out-of-character moments. As noted on the character page, he once used Sesquipedalian Loquaciousness to tease Bakugo, even though he's supposed to be one of the least intelligent characters even under normal circumstances. He is also the only student to express admiration towards Stain.
- Then there is his strange behavior on two separate occasions in battle. At both USJ and in the first provisional license exam, he initially seems to be frightened of the challenges ahead. However, when Yaoyorozu and Jiro hide under an insulating sheet in the former case, and Bakugo and Kirishima are turned into meat potatoes in the latter, Kaminari suddenly changes his attitude. He becomes confident, and seems to relish using his power. It is especially notable in the license exam, since he undergoes this change when his situation is at its worst, and as soon as Bakugo and Kirishima are restored he reverts to his previous cowardly behavior. It is all too odd.
One aspect that may have just been oversight, but during the Human Calvary event at the Sports Festival, we clearly see Kaminari use his super discharge move. Yet for the rest of the event, he appears to be fully lucid, and we even get a close up on his face when one of the characters is talking about him, and he looks fine. However, as soon as the event ends, he suddenly goes into the "moron state" that he goes into whenever he does the discharge.
- It should be noted that he only enters his "moron state" whenever he reaches the limit of his quirk. We're never actually given an idea what Kaminari's limit is, but it's clear he can still use his quirk (even his super discharge moves) multiple times until he hits it.
Some further minor points: His room is noted as being curiously random, unlike the others which generally give strong impressions, as if thrown together by someone who wasn't quite sure what his room ought to look like, perhaps because he was playing a character. Kaminari is noted as being one of the first characters to be designed, but his original design was radically different from the final one because it was "too villainous-looking." There is also an odd official art sketch released on twitter where' Kaminari's face almost looked like two different faces put together because of how different the two sides were. When someone mirrored that face to make both sides the same, the resulting appearance was clearly villainous.
- If Denki is the Traitor and he was just faking his stupefaction, he'll reveal that he can manipulate thunderstorms in a Battle in the Rain and give himself lightning fast speed.
- Counterpoint: His generic room as evidence is weird; several other classmates also have "boring" rooms and most dorm rooms look like stuff you'd just throw together rather than an interior designer's heaven.
Counterpoint: Denki's present when the class resolves to rescue Bakugo and is privy to the fact that they have a tracker, and yet when Deku et al. arrive at the Nomu facility there's not even a single guard that catches them sneaking around. Why not make the call immediately to his villainous employers so they could strengthen security around the area, at least?
Counterpoint: During the Two Heroes movie, when Denki overloads his Quirk and goes into stupid mode, he shows zero ability to protect himself or avoid danger, requiring his teammates to protect him. Faking a weakness would be one thing, but would he actually endanger himself to perpetuate a ruse?

The traitor is someone from Class 1-B

Think about it. When the Villain Alliance invaded the USJ, they knew what was inside but not the Quirks of Class 1-A. Unless they got the intel about the USJ when they retrieved the schedule, the only other people at that time who would've seen the inside of the USJ would've been Class 1-B. Some of the students of 1-B expressed jealousy of 1-A's popularity, so one of them could be the mole. We weren't introduced to Class 1-B until the Sports Festival Arc, so we have no idea when they did their rescue training. They likely did so before Class 1-A. Supporting this is that All Might was supposed to be at the USJ when the Villain Alliance attacked, when Izuku's class was being taught. All Might also taught during 1-A's combat training. But what about 1-B? Who taught them? All Might barely had enough time to just teach 1-A, so he likely didn't teach 1-B. Also, during the School Trip Arc, the Villain Alliance arrived at the camp after Class 1-B did.

The traitor is not a student but a teacher

Remember that the Villain Alliance wants to put an end to the society as it is now in the story. Their plans are all in order to shatter and destroy the public trust in heroes and feeling of security.While from the viewer perspective it would be more impactful if the traitor was one of the 1-A class students, from a more in-universe point of view it would be much more shocking if he/she were to be a teacher.Think about it, how would you feel if a renowned hero who has saved many lives and is so well known and respected that he/she was offered a place on the most prestigious heroes school? How would you feel learning that for years young aspiring heroes, your children, brothers and sisters, were in the hands of a villain and no one ever suspected it ...?There are also hints that point to it:

It is not the first time that the school has been invaded. Three years prior to the story UA was attacked. And that was before any of the current students entered the school. This proves that the school had been targeted before so it is possible that the traitor was already in place back then.
During the USJ Arc, the villains didn't know anything about the students' quirks. If one of the students had gone far enough to provoke the journalist's invasion in order to steel information about All Might schedule AND about the USJ as a whole, then why not bother also give the villains data on the students? They all knew each other's quirk well enough at that time so it would have been a piece of cake, and the villains could have think countermeasures against people who could possibly escape and warn the rest of Yuuei, like Iida.
So far, the Alliance of Villains had access to information that the students hadn't access too. Or at last, moment giving too little time to the villains to come up with a very elaborated and effective plan.

But it is also true that the mole being one of the characters we learned to care for or even love would also give rooms to a lot of interesting character development for the others depending on who is the actual traitor. So, another possibility would be that there are two moles: one teacher, and one of the students.And they may or may not do it willingly ...

It's more likely a teacher however given the evidence that it'd have to be a professor that could be jealous of All-Might like Endeavor was and wanted to take him out. Also, to anyone who thinks it's Himiko? She was only there after Stain was defeated, so it's likely the L.O.V. had someone in the group well before then if that is the case.

The traitor is Thirteen

Thirteen's body is never seen and s/he was the only other hero present when the villains first planned to kill All Might. S/he also avoids fighting and only used the Black Hole for suction, there could be other uses s/he used to support the vimlains.

Except their main goal during the USJ was to kill All Might. Thirteen was made aware of this fact before Aizawa and the others showed up, so why wouldn't they call Tomura or Kurogiri and call the plan off if they knew All Might wouldn't be there?

The Traitor is Mirio.

Simply put, his ability to phase through walls/floors would allow him to spy on anyone and everyone at any given time.There is also the fact he may have been someone they wanted to take All Might's place. He may be somewhat aware of that and feel spurned, or perhaps he'll be revealed to be such for the sake of showing Deku being the correct choice all along.

This theory makes a lot of sense the more one thinks about it. When the League of Villains first ambushed Class 1-A at the USJ, several things stick out: 1. They knew All-Might was SUPPOSED to be there, but his own actions forced him to take a break. 2. They did not know any of Class 1-A's quirks, something any teacher or 1-A classmate would have easily known. 3. Shigaraki Tomura (Mr. Handsy) had "heard rumors" that All Might's One for All was weakening, though he didn't seem to know of All Might's time limit. It seems like their intel has some strange gaps until you realize that the traitor must be someone outside enough to not know much about Class 1-A naturally, but still be close enough to the staff to pick up on good tidbits (like sudden boot camp location changes) and know exactly where to look. Mirio fits this almost perfectly.
Also note, though the manga does subvert many typical Shonen Jump tropes, it does still keep well to typical Shonen jump storytelling style. One recurring trope in Shonen jump manga is that a respected character shown to be able to demonstrate advanced techniques and beat (or at least provide a real challenge for) the main character turns renegade (Vegeta, Sasuke, Usopp). Mirio's already shown his metal.
Counterpoints: Mirio's internal monologues have also depicted him in a heroic light, so unless it's through brainwashing or blackmail, it doesn't seem like he'd aid a group comprised of Villains. Then there is the matter of his confrontation with Chisaki, where he makes it abundantly clear that he won't tolerate injustice, both in internal and external monologue.

There is no traitor.

Despite the League of Villain's ability to seem to know exactly where Class 1-A is at any given time, if one looks close enough at it, they'll realize that none of the info gathered couldn't simply be gained from someone following Class 1-A, and their notable gaps in knowledge (not knowing Class 1-A's quirks or that All Might wasn't at USJ) that should not have been hard for any traitor to find and relay quickly speak against them having an inside agent. Spreading terror seems to be Tomura's modus operandi, and making U.A. believe there's a traitor in their ranks would certainly cause a major drop in morale and a major rise in paranoia. It also makes his supposedly high-cost precision strikes make tactical sense, as their real objective would be to spread fear; no matter how the actual missions turned out, the message would be "We know.".
- Tomura claims to have only "heard rumors" that All-Might was fading, and didn't seem to know about All-Might's time limit (he could have guessed that it was up just from reading the news that day). He also seemed to have no idea that Eraser head and Thirteen were with the USJ class in his stead; that right there virtually eliminates all Class 1-A teachers and students from suspicion, as they would know and would have had ample time to communicate that with Tomura.

The traitor is the principal Nezu

Mostly guessing, but the reason behind this is that one of the members of Chisaki's gang looks remarkably like Nedzu. His motivation would be misanthropy due to being a test subject for what were probably horrific and unsafe experiments. Furthermore, his own quirk is ridiculously easy to imitate, and could be a smokescreen for the real quirk that is "Shapeshifter".
- Super-intelligence is not "ridiculously easy to imitate". While the manga doesn't go into a lot of depth, the anime clearly shows him using his intelligence to calculate the angles at which to hit objects to set off a long string of chain reactions that end up trapping Ashido and Kaminari. While yes, it could be possible for him to naturally be a genius with a shapeshifting quirk, it seems unlikely that genius of that level is natural. And if he was the traitor, it's unlikely that he would have attempted to delay All Might as he did during the USJ arc, as the villains wanted him there and were planning to leave until he showed up alone, ahead of the backup.
- Nezu is also aware of One for All, but Shigaraki isn't, and All for One states that he was not sure that All Might had passed One for All on until their fight. It would be kind of stupid of him to not give All for One such pertinent information about his arch-nemesis.

The mole is All Might.

Unintentionally, that is, one of All For One's many Quirks would be a blood-based Quirk that allowed him to see through the eyes of anyone he ingested the blood of before, and he could have gained All Might's blood when they fought five years prior the start of the series, following the second fight with All Might, the damage that All For One took was enough to disable the Quirk, and he was incarcerated anyway, right now the search for the mole is a wild goose chase, and will only cause unease and mistrust among the U.A. staff.

There is a similar ability in BIONICLE. However, having used it on only All Might wouldn't explain them finding the Pussycats training area, since it was kept secret to everybody who wasn't going, with decoys added in, so there can't just be All Might alone.
This wouldn't work because All Might was never told where the field training was going to take place.
Also, you'd think that if this was the case, All for One would have told Shigaraki that All Might wasn't going to be at USJ.

Deku is the mole.

An unknowing one. All for One is aware of his younger brother's presence through One for All (he co-created the Quirk after all), and thus is always aware of Deku's present location.

This would explain why the mole hasn't given any information (so far as we know) after the training camp- All for One hasn't been able to give the League any messages, and this link only allows location-based information to be gained. It also explains why they thought All Might would be at the USJ, as presumably All for One hadn't yet figured out that All Might had passed on One for All's power and thought he was tracking All Might to the USJ. After that incident he knew a student from class 1-A had to be the ninth torchbearer, and he probably figured out it was Deku after seeing him perform at the Sports Festival. The only other known leak, the training camp location, can be explained by All for One knowingly tracking Izuku to find his class.

Toga is the mole, having taken the place of someone on the UA staff using her "Transform" Quirk.

She might even be shuffle-picking staff to imitate and is obviously taking advantage of situations where blood can be shed.

Problem is, one of the first incidents believed to have been caused by the Mole, the USJ Attack, couldn't have been done by Toga. She hadn't joined the VA at that point, nor even heard of them until Stain and the Nomu's attacked Hosu. She'd have no reason to help them.
- All indications are that the League of Villains don't actually know anything about a traitor. Shigaraki and Kurogiri never hint at such knowledge, even in their private conversations. As such, whoever got the inside info they use reports directly to All For One, who passed it along to Shigaraki. It's entirely possible that Toga was already doing spy work for All For One (willingly or otherwise) before joining the League.

The mole is Blood King.

As 1-B's homeroom adviser, he has access to much of what Aizawa has access to — teaching schedules and possibly the knowledge that All Might isn't long for this world, but might not adequately remember students' quirks (especially since they weren't his students) enough to efficiently relay it to the villains. When the villains attack USJ, Blood King does show up at the end, but only because it's "expected" of him as a UA teacher. Notably, the location of the training camp was changed last minute on a need-to-know basis, which means plenty of faculty didn't know where it was going to be...but as 1-B's teacher, he would. During the camp itself, Blood King stays at the facility despite it only ever being attacked by Twice's Dabi clones, when his skills as a pro hero would arguably be more useful on the field. Also, his quirk is blood manipulation, which ties him thematically to fellow blood-themed villains Stain and Toga.

On the positive side, his being the traitor would explain why the League of Villains' ambush was so well planned, as he presumably knew about the Test of Courage and that at that point the students would be scattered through the woods and unable to fight back effectively.
On the negative side, he most likely was aware of the Hideout Raid (both the Nomu Factory and Villain Bar parts), since he was a pro hero and part of the whole debacle. It's also unlikely that Shigaraki would need to let reporters in to create a distraction if a teacher like Vlad King was the traitor, since he could just grab a copy and hand it off to Kurogiri without any fuss.

The mole is Uraraka.

For someone billed as the series heroine, Uraraka does not get a lot of focus, and has just about as much page time as ostensibly-supporting characters Kirishima and Tsuyu. Of course, the fact that Horikoshi is waiting so long to get into her head and find out her thoughts could be a set-up for a big reveal down the line.
She already has a motive that the villains can take advantage of (financial support for her family.)
Uraraka, notably, does not go on the mission to rescue Bakugo and even tries to dissuade them from going, even as Midoriya pushes for it. (Contrast with Iida, who goes on the mission to look out for Midoriya.)
This line of dialogue may just be Toga being creepy, or...
"You are very well-trusted..."
Her deciding to put her feelings for Midoriya aside could be a "focus on the mission" attitude, especially given that the narrative contrasts her repeatedly with Toga, who is more upfront about her Villainous Crush.
It's subtle, but Uraraka is contrasted in many ways to Bakugo through their relationships with Midoriya. And now that the manga has already proven beyond the shadow of a doubt that Bakugo, despite seeming extremely villainous, has heroic goals, what does that make the seemingly heroic Uraraka?
I think that while a lot of other traitor theories raise good points, what they're really missing is how The Reveal will emotionally affect the main character, Midoriya. Uraraka is his first real friend and a constant source of moral support, imagine how it'll go over if she's revealed to be the traitor. How's that for subverting Shonen expectations?
- Except it doesn't subvert expectations as there has been precedents of a friend being a traitor before. Kaede Kayano of Assassination Classroom has the most similarities to Ochaco in this scenario in that both are Kind Girls that befriend the main protagonist, only to reveal a much darker side behind their kind exterior due to personal reasons. Uryu Ishida underwent similar treatment in the final arc of his series, and Dennis Macfield was revealed as a form of Dramatic Irony long before the main cast learned. So, it wouldn't really subvert anything. On the emotional front, Midoriya has shown to be friends with all of 1-A, the only possible exception being Bakugo, but they're getting closer, so any of them being the traitor would emotionally wound him, not just Ochaco.
  - The point wasn't that it has never happened before, the point is that you're still predisposed to trust the heroine in a Shonen, which is why cases like Kayano's are effective.
Pretty much an Epileptic Tree of weapons-grade tinfoil hattery, but the character profile for Uraraka in the collected volume says "She's unexpectedly brazen and frank. Proof that there's no hidden side to her, if you catch my drift." I don't know if translation factors in or how much of a Trolling Creator Horikoshi is, but that sounds an awful lot like a Suspiciously Specific Denial, doesn't it?
Counterpoints: Much like the counterpoint for Kaminari, Ochaco was aware of the rescue mission for Bakugo, and it would be foolish of her to not report it in. Her primary motivation is financial security for her family, but the Villain Association doesn't have a stable method of income. Toga stole her blood in order to change into her during the License Exam Arc, but she wouldn't need to if Ochaco was indeed the mole. If Toga didn't know she was the mole though, then the trusted comment makes no sense. As for her being the traitor, none of the incidents that the traitor is accused of being responsible for could apply to her. She had no knowledge of the USJ being the location for training, had no access to the school schedule, had no way of knowing All Might was weakening, was asleep when the VA showed up, and knew of the Bakugo Rescue Mission. The numbers don't add up.
- Counter counterpoints: Toga's comment was not because she knew, but it was the author using her character to tell to throw the readers a hint. Also, Toga was very good at reading people and recognized somebody wearing a "mask", something she did during her middle-school and arguably still do. As for her knowledge? All that could be solved with her carrying a tracker on her person. Also, take note that Shigaraki did his first attack in order to kill All Might, but his target was not there... showing us that whatever information the villain got did not actually tell him who was there. Her being asleep when the VA showed up during the training arc proves nothing and her knowing about the Bakugo rescue mission actually proves the point. She was conflicted and during her time at the academy she actually befriended people so she didn't want them to get hurt. This was why she tried to talk them out of rescuing Bakugo.
- Plus, at the beginning of the episodes in Season 2, She's shown with the people who 'supported' Midoriya in the past during his narration about how he became the greatest hero. Basically, My Hero Academia is Deku's history on how he became a hero, and Uraraka was there throughout it all.
  - Counter counterpoints: I would call that red herring. She could perfectly support him even if she was the traitor. Like she could have regrets and help him later on, or perhaps even her betrayal helps him becoming the greatest hero since he is forced to understand why people become villains. Also, don't forget that the author had originally planned to have the final battle in the manga play out like the one against the villain "Nine" in the movie did. That was scrapped, which tells us that even if he had something planned at the beginning, he could change it later as long as he hasn't written himself into a corner.
- Uraraka also has an inner monologue during the Joint Training arc about how she looks up to heroes and enjoys helping people, which definitely doesn't gel with her being the traitor.
  - Counter counterpoints: Yes and? She looks up to heroes because she wants to be her parents heroes. She revealed that she wanted to become a hero so that she could make money and support her parents. Deciding to help her parents and become a villain does not mean that she can't admire people she is betraying you know? In fact this goes well in hand with her thoughts later where she decides to steel herself against her feelings and only focus on her future.
  - ...That makes no sense. Seriously, the LOV has no substantial means of income, which was her initial motivation, and the monologue about her admiring heroes and wanting to save people came while she was saving Midoriya from Black Whip, and reminiscing about how she feels she failed to save Nighteye. Add on her being steadfastly determined to finally stop Toga when they fight again during Gigantomachia's rampage and refusal to entertain her questions, it should be pretty obvious the "Uraraka is the traitor" theory is firmly in the garbage and all but entirely jossed.

Hagakure is the traitor

I'd like to first say that this theory is not mine, rather one I came across from the Youtuber Joy_Boy Theories, which he expanded on from a reddit post he found. Here is his initial video if my rambling doesn't make sense. https://www.youtube.com/watch?v=Opp8AoDsPWA&list=PLcHATnT6pFJc-Bl4CVQkpP_9BlAZbrYsh&index=1

Now, Tooru Hagakure/Invisible Girl may seem an odd choice for the traitor due to how often in the background she is. But that is the point. It's awfully conspicuous that the Invisible Woman is rarely touched on. Yes, it could just be a "Invisible Girl you forget is here" joke, but it does have some merit when you notice some awfully suspicious behavior from Hagakure.

To start off we have the USJ. Now, the traitor is assumed to have gotten the VA a copy of the Teacher's Schedule, which allowed them to invade the USJ. Hagakure herself shouldn't have access to a Faculty Item like that, but it is worth noting that she doesn't need the access to get it. By removing all her clothing, she is completely invisible, meaning she could easily slip in when a teacher was leaving the room, grab a copy, and hide it outside the room to pick up later (After all, the paper would still be visible). And there is a situation in which she could have done this. During the voting for Class Representative, a list was shown depicting all students and the number of votes they received. When counting up the number of votes however, there are only 19 votes total, yet the class has 20 students. Every student appears to have voted for themselves with 3 exceptions, Todoroki who voted Yaoyorozu, and Iida and Ochaco, who voted for Midoriya. With this in line, there should be only three students with 0 votes, those 3, but Hagakure also has 0 votes. And on voting day, one student was conspicuously missing: Hagakure. Not even her clothes were there, so she was either absent or naked. Since it's unlikely she'd be walking around class naked, she was probably absent, leaving a window for her to get the list.
But the real issue with the USJ is her location during the attack.
- In the Manga, after Kurogiri warped most of 1-A around the building, the following chapter had a map page detailing the locations of each student, with two exceptions. The first was Aoyama, which went in line with a slight gag later on where he tried to find someone to ask where he was and say it was a secret. The other however was Hagakure.
  - Hagakure claims she was sent to the Landslide Zone alongside Todoroki, but as Todoroki notes, he could have frozen her. The students warped were all shown to land in close proximity to one another (Midoriya, Tsu, and Mineta landing in the water, Kaminari, Kyouka, and Yaoyorozu surrounded by villains), so Hagakure should have landed near Todoroki. Her uniform, a pair of gloves and shoes, should have made it easy to see her, but they weren't there. While it is true she may have discarded them to be completely invisible, Todoroki froze the entire area around him immediately after landing, giving her no time to do so. Even if she had the time, the Heroes vs. Villain's exercise showed she would be shivering from the ice and leave imprints in the ground, while also being incapable of moving without hurting the skin of her feet. None of the evidence suggests she could have been there.
  - Just Prior, Hagakure approaches Ojiro and comments of his work in the Conflagration Zone. Ojiro mentions he was constantly running around and thought he was alone. This is important because Hagakure's claim she was in the Landslide Zone would make this impossible, as the map detailing the student's locations showed the two zones were on opposite sides of the USJ. Hagakure's statement implies she saw him during this, meaning she would have to be in or near the Conflagration Zone, and since the Conflagration Zone is not near the Landslide Zone, and the evidence suggests she wasn't in the Landslide Zone, that would mean she was actually in the Conflagration Zone. But why would she lie about her location to Ojiro? There are two possibilities.
  - Like Aoyama in the Training Camp Arc, she was too frightened to help and lied to cover her cowardice.
  - She was watching Ojiro from the sidelines so as to not be caught in the crossfire of the villains and Ojiro, and lied after she let slip she was watching him.
Next, we have the trip to the shopping mall where Midoriya met Shigaraki. Now, Shigaraki is shown to not really go out in public much as he can't have his dad's hand on his face in public without being recognized as a villain, and he uses said hand as a security blanket like item, but when he goes to the shopping mall, he picks Midoriya out of a crowd and holds him hostage in order to get his insight on the difference between himself and Stain. Would seem like too much of a coincidence that one of the few times he goes out in public, he runs into Midoriya. Unless you come to the conclusion that he knew Midoriya would be there. How does this relate to Hagakure? Well, guess who suggested the shopping trip. Yep, Hagakure did.
Next, we have the events of the Training Camp Arc. During the initial invasion, the temporary VA member Mustard uses his quirk in an attempt to knock the students out, but fails due to Yaoyorozu making gas masks, however two students still succumb to the gas and are left comatose during the Bakugo Rescue Arc. One major counterpoint against most of the Traitor Theories is that all of the conscious Class 1-A knew about the Rescue Attempt, and that because the VA was unaware of the Attempt, the Traitor couldn't be among the Class 1-A students that knew, as the Traitor would have alerted the VA. But remember, two students weren't aware of the attempt due to being comatose, Tooru Hagakure and Kyouka Jiro. Because she was unaware of the mission, she wouldn't be able to warn them. Before you ask though "Why did Mustard knock her out then?" You need to remember two things.
- Mustard's Quirk works indiscriminately, hence why he has to wear a mask too.
- The Villains present at the Invasion were all new recruits, and were likely to not know all about the VA's asset's in the event they got captured. Since 3 VA Recruits were apprehended but the traitor is still unknown, this seems to be the case.
The problem with all of this is honestly the numbers as mentioned before with Kaminari and Uraraka. With all of it said and done; it's harder for ANYONE in Class 1-A to be a traitor as there is little evidence aside from small guesses and things that have been countered left and right. And yes, she is invisible...but that doesn't automatically mean 'I'm the mole' as that would be too obvious.
- Except the numbers do add up in her case, as all the stated evidence has no counter for them. How did she know what Ojiro was doing if she was on the other side of the USJ? How did Shigaraki know exactly where to find Deku in the mall, a trip she suggested? How did the Villain Alliance not know about the Rescue Attempt when all of the students aside from Hagakure, Jiro, and Bakugo knew about it? There are so many points about her that don't make sense unless she is the traitor. Her knowing about Ojiro is because she lied about her location and was watching him. She set up Shigaraki's meeting with Deku. She was one of the students that didn't know about the rescue attempt, so the Alliance couldn't know. And the Invisible Girl being the mole is not actually too obvious, the point was that her being the Invisible Girl would make her lack of focus come off as more a joke on the fact she is invisible when it's really a planned ruse. Her characterization makes her being the traitor work. Hagakure is the energetic girly girl often hanging out with Ojiro, always happy and kind. The fact she is invisible though means we have no idea if this is genuine. She could be easily putting on a front, whether as a way to mask insecurities like Kirishima, or for a villainous goal. We can always be guessing, so she could be the traitor, or she could be a Red Herring. It keeps you guessing, which is what the identity of the traitor has been doing to the fans.
I didn't want to play this card, but there is one other thing that makes her suspect: the lack of knowledge on her Quirk. https://www.youtube.com/watch?v=U_j2DZBm3BU&index=3&list=PLcHATnT6pFJc-Bl4CVQkpP_9BlAZbrYsh Of all of Class 1-A, she is the only one who's quirk has yet to be fully explained or even demonstrated.
- All the classmates have had their quirks explained in full, even if they weren't the focus of the appearance, like Sato's was when facing Cementoss, or have demonstrated enough to have a general understanding, like Koda's when facing against Present Mic. Hagakure's quirk however is never really explained, and wasn't even named in series, it was named in a data book. Then consider the fact her quirk hasn't been fully explained makes sense, because it is a plot point. There have been opportunities to put a text box there explaining it, like during the Hero License Exam Arc, yet there isn't one.
- Her quirk is said to be Transparency, allowing her body to remain invisible. For a while, it just seemed to be that, but during the Hero License Exam, she used an attack called Light Refraction. Refraction can be achieved through Transparency, but not Invisibility. Invisibility is the lack of physical appearance, you cannot see it but it is still there. Transparency is something that can be seen, but is clear. Imagine a light shined at Hagakure's body. If she was invisible, the light would shine around her, casting a human shaped shadow behind her. If she was transparent however, the light would shine through her and distort via refraction. Here in lies the issue. Her quirk is called Transparency, yet she clearly seems to be invisible, so she shouldn't be able to refract, unless she wasn't actually invisible. An argument can be made that Horikoshi messed up the science on her quirk, but with the detail put into Mirio's Permeability, alongside the realistic effects like inability to breath or falling when used, it doesn't seem like he would do that. The reason there is a discrepancy between her quirks name and her physical appearance is because she isn't actually invisible. She is bending light around her body ala refraction to give the appearance of invisibility, when she is actually merely see through. Real life scientists have tried using refraction tech in making actual invisibility cloaks, so it has science to back it up.
- Why would Hagakure lie about her quirk though? Simple really. Even if she is translucent, she would have enough of an outline to be recognizable, so in public she remains invisible to be Tooru Hagakure. When not actively making herself invisible however, she is her translucent real self, with no one able to tie her back to her cover identity. Though one may argue, why can't Aizawa erase her quirk then and show the real her? Well for one thing it has been numerously stated that Aizawa's quirk works differently on Mutant Class Quirks, it only shuts down the ability to use the mutation, but doesn't shut the mutation off. They used Ojiro as an example, in that if he was to be "erased", his tail would go limp, but still be there. Because "Tooru Hagakure"'s quirk is having a permanently invisible body, Aizawa would be under the impression that erasing her quirk would still leave her invisible. In addition, Aizawa only uses his quirk on his students as a threat to get them to calm down or behave, the exceptions being his using it on Deku during the Quirk Assessment Test, and Todoroki and Yao-Momo during the End of Term exam. He never actually used it on Hagakure, and never needed too. If he did though, something interesting could happen....
- Adding on to this is something said by Horikoshi at the 2018 San Diego Comic Con. According to Horikoshi, were Toga to ingest Hagakure's blood and use her quirk to transform into Hagakure, she would not turn invisible. This is important as the implication behind Hagakure's quirk is that it's a Mutation Class Quirk.^note If that were indeed the case, then Toga's body should indeed turn invisible were she to transform into Hagakure. With Horikoshi saying this isn't the case, Hagakure's Qurik isn't really a Mutant Class, implying her "natural" appearance is her actively making herself invisible. Why would she do this though? To disguise herself. So long as she looks invisible on a regular basis, when she actually stops doing such, no one would be able to connect her real appearance to her public appearance.
Worth noting also that in the character notes that cap off manga chapters sometimes, Hagakure was featured at the end of Chapter 10. Horikoshi tends to highlight characters who've had significant presence in the story of the chapter/general plot to that point in the notes, but Hagakure hadn't said or done much of anything to that point (or even to date). This might indicate Horikoshi planned for her to have a more crucial role early on and wanted readers to be familiar with her. Connecting to the above points about her quirk's lack of explanation, in the notes he also said there that he wanted to introduce her quirk properly, but the right time hadn't come yet. Perhaps the right time would've been the traitor reveal.

The mole could be unaware they are a Mole

It's very likely that, if either teacher or student (more likely teacher) that the LOV had someone be attacked unbeknownst to others and had them be put into a sleeper agent state. They could be totally unaware of what they are doing during that time and be susceptible to All For One's powers. It's also shown that he has many quirks, including ones that have affected the mind so it can be possible that this is the case.

Counterpoint to all theories involving Class 1-A and the UA teachers

Back during the USJ Arc, Kurogiri warped most of the students to different areas of the USJ. But it was mentioned that, while the League of Villains knew what was in the USJ, they had no idea what the Quirks of Class 1-A are. If the mole was someone in Class 1-A or a teacher, then they would have at least had some idea what their Quirks are. If the mole was a student then they would've found out either from Aizawa's Quirk Apprehension Test and/or All Might's Combat Training. And if the mole was a teacher, then they could've just pulled up the files about each student to learn about their Quirks. The fact is that if the mole was either a teacher or a 1-A student, then they would've had at least had a basic idea of 1-A's Quirks. Then Kurogiri would've warped each student to areas where they would be at a disadvantage. For example, Tsu, due to being a frog-girl, should've been sent to the Conflagration Zone, since there is literally fire everywhere. Instead she was sent to the Flood Zone, which is practically an indoor lake. If it wasn't for her, then Izuku would've been eaten by that shark villain.
- Counter Counterpoint: The USJ arc happened fairly early into the School Year, about only the second week, and it was made clear the students didn't have good grasps on each other's Quirks. For example, Kyouka Jiro wanted Denki Kaminari to start zapping villains left and right, but Denki had to tell Jiro his Quirk is an Area of Effectiveness like Quirk, in that it just zaps everything around his area indiscriminately. And as the student files would more likely only have a generalization their quirk, the Mole wouldn't be able to get an accurate idea about their classmate's quirks, due to lack of information.
- Another Counter Counterpoint: it's possible that the mole knew what Quirks 1-A had but didn't give it away on purpose. Maybe the mole was trying to secure their own position, because letting VA know what Quirks students have would narrow list of suspects down to 1-A students and teachers. Another possibility is that not letting VA know student's Quirks would provide some challenge to them. Because hey, if your villainous group can't handle a bunch of untrained high schoolers without knowing their abilities, how you suppose to fight actual trained heroes?

The mole is Endeavour.

Similar to the WMG that the mole is unaware they are a Mole, it could be Endeavour is simply getting his info from Todoroki, who is unaware of his own father be the leaker. It makes sense for Endeavour and the Villains to cooperate as they share the goal of overtaking All Might.
- In the Hero Killer Arc, Endeavor shows up quite conveniently to take out the Nomus, which were also conveniently limited to 3 (from 6) by AFO; likely as a compromised publicity stunt to make Endeavour look good.
Counterpoint: Endeavor and Todoroki are hardly on speaking terms, particularly not to the extent of Todoroki sharing information with him (willingly, that is...) Their relationship has only gotten closer recently (as in "Todoroki not being openly antagonistic and hating his father" closer) and certainly would not have been at that point in the USJ arc, where the first hints of a traitor were seen. Furthermore, it isn't that Endeavor wants to Klingon Promotion All Might, he wants to defeat All Might himself (or by proxy with Todoroki) to prove he's the better hero. Teaming up with a bunch of villains to wipe out All Might seems quite antithetical towards his desire, as he wants to prove that he's better than All Might, not just get All Might out of the way so he can come the strongest by default, as shown by his disdain at achieving the title of "strongest hero" after All Might's retirement.

If the Traitor is a student, then they will be an Evil Counterpart to Izuku.

The traitor was born quirkless and was constantly bullied for it like Izuku, but they met All for One instead of All Might. All For One gave them a quirk and groomed them to be a hero hating spy for the League of Villains.

The Traitor is Mei

Her frequent appearances in the School Festival Arc brought this to mind.

Her Quirk allows her to zoom her vision, so imagine how far she could see with her goggles. She could theoretically use them to follow the bus going to USJ or the camping grounds.
The reason she teamed up with Izuku during the Human Cavalry Battle in the Sports Festival was because she wanted to get close enough to him to place a small recording device on him, presumably in the crevices of the soles of his shoes.
Her "Little Babies" that she has been making for Izuku are programmed to malfunction at the right time. The only reason they didn't during the Internship Arc was because Izuku and Shigaraki had a common enemy with Chisaki.
The reason she's trying to get the attention of investors is because she's trying to help fund the League of Villains.
- If she is trying to invoke Cut Lex Luthor a Check, she'd better be revealed to be the traitor when attempting to steal 40 cakes. Because that's as many as 4 10s. And That's Terrible.

The Traitor is Mineta

It feels awfully suspicious that for most of the manga that Mineta has continued to be a nigh-unlikable perv while a lot of others develop as characters. But what if that's all just an act? By acting that way, he could make others see him as too much of a girl-obsessed weirdo to see him seriously be plotting against them. There's also his high intelligence stat, which we never see him use. But thinking about it, while we've seen his interactions with others we've rarely seen him alone (And most of those times were small gags). Maybe when we don't see him he's helping out with the League.

Most people dismiss him as a suspect because 'he's the worst', though it would create a new context. There is, however, the argument about a traitor sticking out that much.
It puts a new light on his talk of putting cameras in the girls' bedrooms, and the fact that he somehow has high grades despite being apparently unable to understand the meaning of the word "stop."

The traitor can't be from Class 1A

The only reason UA has had so much trouble recently is because word got out that All Might is teaching there. However, the public didn't know that until just before the USJ incident, so there's no reason to send a mole to UA when it hasn't done anything to attract attention yet. Considering we've seen all of Class A-1 before All Might being a teacher was known to the public, it stands to reason that they're all in the clear.

Except All Might taught their class himself before then, during the Heroes vs. Villains exercise. Even then, there was rumor of him teaching there, so the VA could have sent a scout in order to confirm it, who was then upgraded into the mole.
Even if this theory would be true, that would disqualify not just 1-A, but any student period, leaving only the teachers. And considering the Traitor has to be a character relatively well known to have any sort of impact, that would leave very little options. Nezu himself doesn't believe it to be Mic, Midnight, Snipe, or All Might, and he himself internally monologues about it so he's out. Aizawa and 13 were victims during the USJ, so they're out, so that would only leave Vlad King, Cementoss, Ectoplasm, Hound Dog, and Power Loader, none of whom receive any real focus amidst the teachers. Unless they made it one of the teachers Nezu says he trusts, the teachers seem unlikely, so the traitor would have to be a student. Snipe himself is often Out of Focus, and it obviously isn't All Might himself, so that would only leave Present Mic, who brought forth the idea so it would seem less likely to raise the idea when it would cast suspicion on himself, and Midnight, and she too doesn't get much focus. The only idea that has any impact to the narrative and to the readers would be if it was a student.
- While the theory does exempt all of A-1, it doesn't necessarily apply for the other classes. Just before the USJ arc takes place, someone destroys the front gate and allows the media to swarm in, which would have been the perfect opportunity for the mole to sneak in and preform a Capture and Replicate on a student. And all the first years, A-1 included, would be out of the question as we saw that they were all in the lunch room at the time (assuming all students in the same grade have lunch together), meaning that one of the older students could have been the target.
  - The cafeteria was shown to have upperclassmen too, since there was one who informed the characters what the alarm meant. And Capture and Replicate isn't an option since the only one shown there was Shigaraki, and even then, none of his group members at the time displayed any such capability. The only way they could have done that would be through Twice and Toga, who weren't members of the group at the time. The newsmedia getting in was meant to be a distraction so the mole could get the list, as the staff would be more focused on the news media to be in their faculty rooms, and the students would be too busy panicking to notice one of their own missing. So the Capture and Replicate option is out. And considering both 1-A and 1-B are shown to have the same lunch time, if 1-B isn't excluded, then neither is 1-A. None of the classes can be excluded, only certain students in the classes.

The Traitor is not...

So far, everyone is scrounging to get information on just who the traitor is, but why not work backwards? Why not first eliminate all the students who it can't be? Its fairly easy to determine who isn't the traitor, as the traitor has to meet certain criteria.

1.) They are relevant to the story. It obviously won't be someone minor to the story like, say, Lunch Rush, since they're so small in the grand scheme of things it would lose its impact.

2.) Their reasoning/motivation is unknown. Internal monologues and flashbacks are most likely honest, so if a character internally monologues in a way that would contradict being the traitor or has a flashback detailing their backstory and motivation, they're out.

3.) They are reasonably capable of performing the acts the traitor is accused of. The traitor is accused of getting a school schedule for the League leading to the attack on the USJ, and also informing the Vanguard Action Squad of the Training Camp's location. If the character reasonably couldn't do it, they are less likely the Traitor.

3.5) As a corollary, they are incapable of performing the acts that would have benefitted the League, but that the traitor didn't do. For example, the League of Villains was unaware of All Might not being at USJ that day (which was a last-minute change because he used up his heroic form earlier), class 1A's Quirks, Izuku having One for All, and the Hideout Raid. The Traitor is therefore likely to be someone who couldn't reasonably access this information.

4.) There are no contradictory elements. If the character has an element that contradicts the idea of them working with the League of Villains, such as being the League's target for whatever reason or directly undermining the efforts of the League without prompt, they are less likely to be the Traitor. The exception to this being the actions of the Vanguard Action Squad, as they could plausibly have not known the traitor's identity, and Mustard's quirk worked indiscriminately and could have easily hit the traitor by mistake.

Very few non- Class 1A and 1B students are relevant to the story, but for the ones who are:
- Shinso's Quirk would be great for being the mole, but it would be absolutely contradictory to his character and motivations. He wants to be a case of Bad Powers, Good People, and being The Mole would render that null and void.
- Mei Hatsume shows very little interest in anything that isn't her inventions, although this doesn't entirely rule her out from being the mole. For more information, see her WMG section above.
- Mirio Togata has internal monologue and flashbacks depicting his drive to be a hero as genuine.
- Tamaki Amajiki shares several flashbacks with Mirio, and his internal monologue supports him being a hero.
- Nejire Hado's quirk doesn't seem like it would be very useful for being the traitor, and she draws too much attention to herself.
- In addition to the prior notes, none of them could have known where the Training Camp was anyway.
Class B is mostly out due to being Out of Focus. While they've achieved some relevancy in the Joint Training arc, it remains to be seen how long it will last. For arguments against specific students:
- Monoma's internal monologue indicates that he sees himself as a side character who aspires to be an Ensemble Dark Horse, not The Mole.
- Kendo and Tetsutetsu work together to defeat Mustard.
- Awase is the one who welded Yaoyorozu's tracker to the Nomu.
Among the Teachers:
- Most of them are Out of Focus, lessening the probability of them being the traitor, and most of the staff are stated to not know about the training camp's location (the presumed exceptions being Aizawa, Nezu, and Vlad King). For individual teachers:
- Aizawa has directly opposed the League even when he could have plausible deniability for not doing so (saving Tsuyu at USJ), and would have known the quirks of his students and that All Might wouldn't be at USJ. He's out.
- Present Mic is the first person to bring up that there could be a traitor at school. If he really was the traitor, he'd be unlikely to bring attention to himself in such a way.
  - As a counterpoint to that, what better way to divert suspicion then by being the one to suggest it? That way, everyone else is busy looking at each other, and, since you're the one suggesting it, they'll assume you're innocent.
  - (half) Counter-counterpoint: Present Mic is the first we hear in-story of a traitor. If he was the traitor, why would he want people looking for evidence that might lead to him? Nezu is also super intelligent, so he'd definitely suspect that this tactic was being used, and Present Mic is probably smart enough to realize this.
- 13 gets badly injured defending students at USJ, and would have known that All Might wouldn't be there. They're out.
- Snipe shoots Shigaraki at USJ and nearly cripples him, putting him out of the action for a while. Had he been the traitor, it would have been easy for him to miss on purpose or stay behind at UA proper.
- In Illegals, Midnight states that she wants to become a teacher in order to help give troubled teens an opportunity to deal with their issues.
- Nezu and Recovery Girl both know the secret of One for All, and that Izuku is the current wielder. Nezu also has an internal monologue worrying about the traitor.
- With All Might, we have internal monologue, backstory flashbacks, contradictory behavior, and he's the league's arch-nemesis. No way no how is he the traitor.
- Vlad King is a possibility. A point in his favor is that he would have known the specifics of the Test of Courage long before the students were, and could have helped the League of Villains set up their ambush, because it was way too well planned out to have been off-the-cuff. A point against him is that there would be no need to have Shigaraki create a distraction if he was the traitor, because as a teacher he would have easy access to class schedules.
Therefore, the only real teacher traitor candidate is Vlad King (Present Mic is sort of half-in consideration). Vlad King would have been able to get all the information the League of Villains had, while it's reasonable that he wouldn't know Class 1A's Quirks in time for the USJ arc. However, he is Out of Focus along with his class, which would lessen the impact of a Vlad King traitor reveal.
Among Class 1A, obviously we can eliminate all of the main characters, as their reasoning and flashbacks are well known.
- Deku is The Protagonist, and we've seen his motivations thoroughly.
- Bakugo we've seen the motivations of, flashbacks of, and as he was the target of the League during the Camp Raid, he's out.
- Todoroki we've seen in depth thanks to his origins arc.
- Iida we know wants to live up to the prestige of his family and follow the footsteps of his brother Tensei.
- Uraraka wants to support her family and we've seen flashbacks depicting this to be true while also seeing her frustration at not doing well in the Sports Festival since that could have gotten her spotted. Plus, considering her motivation is primarily monetary, and the League has no stable income, it would seem unlikely she was working for them for the money.
- Kirishima had an entire mini-arc within the Hassakai arc depicting his backstory and motivations.
While we haven't seen any flashbacks for Yaoyorozu, we are well aware of her desire to be a hero, and she did willingly help out in the rescue attempt for Bakugo, and before that both made a tracker and alerted the heroes to its existence, despite having a head injury for plausible deniability.
Jiro, Mineta, Tsuyu and Koda have all shown flashbacks depicting their drive to be heroes.
- Jiro's showing her admitting to her parents she wants to be a hero rather than musicians like them.
- Mineta desiring to be a hero so he can be cool and pick up chicks.
  - Is wanting to pick up chicks really enough to remove the possibility of being a villain? The tropes Evil Is Sexy and Evil Is Cool exist for a reason. More generally it's worth pointing out that a character's motivations can change over time. One flashback doesn't mean they are necessarily the same person they were in that flashback. Mineta could be a traitor and still be following that goal in a different way. We know in universe that people can see a villain as cool a la Stain.
  - It matters because the traitor is suspected of having been the traitor since the very beginning, considering their first alleged crime was during the USJ, which took place in the beginning of the school year. Mineta's flashback took place during the final exams, and reinforced why he wanted to be a hero, long after the first alleged traitor incident. If the flashback/motivation introspect takes place after the event the traitor is suspected of doing occurs, then they are less likely the Traitor. Meta-Wise it makes little sense for Mineta to be the traitor because he's comic relief, so making him be the traitor would be the equivalent of the Star Wars prequels having Darth Sidious be Jar Jar Binks instead of Palpatine.
- Tsuyu's special chapter where Habuko debuted showed she'd been serious about being a hero since Middle School, implying her drive is genuine. Combine that with her breakdown after the Camp Raid arc and her being targeted by Shigaraki at USJ, she's less likely the traitor.
- Koda's showing his mom congratulating him on getting into U.A. and leading to him resolving to help Jiro during the Final Exams.
Now while Aoyama and Ashido have both been seen in flashbacks, they aren't cleared of being the traitor by that alone.
- Aoyama's flashback only demonstrated the issues he had with his quirk. His actions during the Camp Raid arc however support the idea of him not being the traitor, as it was pure luck that Dabi managed to grab the ball containing Bakugo, which was the villains' entire goal. In addition, his quirk wouldn't be able to aid him in getting the information the Traitor is accused of leaking, and is too flashy to go unnoticed as a signal.
- Ashido's appearance in a flashback wasn't in her own, it was in Kirishima's. While her concern for him after the Hassakai arc supports how he remembered her, it doesn't clear her of being the traitor as we don't know if her behavior was genuine. If it is genuine like the flashback suggests however, shes cleared. In addition, her acid quirk doesn't allow her to achieve what the Traitor is accused of, so she seems less likely.
The traitor is likely not Ojiro, Sato, or Sero, as the three are relatively Out of Focus amidst their class (so one of them being the traitor would be the equivalent of having Darth Sidious be Kit Fisto). None of their quirks allow them to accomplish what the traitor is accused of as well, and they were aware of the mission to rescue Bakugo.
Tokoyami and Shoji are harder to pin.
- While Tokoyami was a kidnap target thanks to Compress and nearly killed by Moonfish, its unknown if Compress knew the identity of the Traitor, so he could have been grabbed by mistake. However his quirk, Dark Shadow, doesn't really give him a means to accomplish what the Traitor is accused of.
- Shoji however was also attacked by Moonfish and lost a Dupliarm in the process, but it's doubtful Moonfish knew about the traitor's identity. While his quirk may have allowed him to eavesdrop on the necessary information, his attempt to rescue Bakugo and Tokoyami, as well as saving Midoriya who Shigaraki wanted dead, contradicts the idea of him being the traitor.

So who does that leave amidst the 1-A students? Only two: Denki Kaminari and Toru Hagakure.

Kaminari has no flashback, his motivations are relatively unknown, and as much of the fan-base likes to point out in his section of the folder, his quirk could accomplish what the traitor is accused of and his behavior leaves him suspicious, as he demonstrates moments of clarity that don't jive with his rather ditzy normal personality. His quirk's drawback also allows him to easily take himself out of any fight with the League of Villains without appearing too suspicious.
- The only issue with him is that he was aware of the Bakugo rescue attempt and Yaoyorozu's tracker, while the League was unaware of both.
Hagakure also has no flashback, unknown motivation, and unlike Kaminari, her quirk is relatively unknown, only having a general idea thanks to visual observations rather than narration. This combined with the evidence listed in her own section of the Traitor Folder, leaves it possible for her to have accomplished what the Traitor was accused of. And unlike Kamanari, she was unconscious while the plans to rescue Bakugo were made, explaining the League not knowing about the attempt.
- The big issue with Hagakure is that like Sero, Ojiro, and Sato, she's largely Out of Focus lest she be needed for a gag. The only reason she isn't amidst those three is by Horikoshi's Word of God that he wants to do an arc for her, and the rather curious statement he made regarding what would happen if Toga Himiko ingested her blood, implying it has some relevance.

So of any Traitor theories, the only ones that should hold any water amidst Class 1-A are Kaminari and Hagakure. Amongst the teachers, the best option is Vlad King. Of the others, Mei Hatsume is the only somewhat understandable option.

There is more than one traitor

I'm suprised that no one has brought this theory up yet, as the existence of two or more traitors would allow for the perfect means of misdirecting both the characters and the audience.

The League of Villains are not acting on all of the information that they get.

This is an actual consideration when it comes to espionage. If information is known by too few people, showing that you know it can give away who your spy is. Information from the traitor was reported directly to All For One, who made the call as to whether they should act on it or whether he should keep it to himself. Shigaraki may take a different approach as to how he uses it.

The traitor is not actually loyal to the League of Villains.

There are ways to get people to help you even if they don't actually want to. Consequently, they're trying to do as bad of a job as they think they can get away with without pissing off the villains; omitting some information from their reports, or being slow to report something as long as they can give a plausible excuse to do so. It would also completely change the dramatic implications of the reveal, since it would mean that the traitor could remain sympathetic.

It would also widen the suspect pool considerably if the traitor really did have heroic leanings (and thus could have heroic internal monologues or act as a hero when alone), and/or was purposefully dragging their feet (and thus wouldn't tell the League all they knew if they could get away with it).

Whoever the traitor is, the identity is not known even by the villains.

As per All For One's dispositions (even if he's currently in custody, we know he's left behind quite a few backup plans), information leaked from U.A. is relayed to a third party who then transmits it to villains, with no direct contacts between them and the informer. Another arrangement is that the traitor won't help the villains in case of attack, neither directly nor indirectly, and will rather participate in the fighting against them to maintain the cover. With such a setup, finding the traitor is hard because even in case a villain was captured and information extracted from him/her forcibly through mind reading or brainwashing, the most he/she could say is that there is a mole among the heroes, which some may even interpret as just a generic statement to instill paranoia among them.

The traitor is someone we've all already dismissed as a suspect.

A lot of theories roll out people based on their internal monologues or flashbacks showing their resolve to be a hero. However, what if the traitor is, say, a Well-Intentioned Extremist that doesn't consider Hero Society to be "real heroes" (ala Stain, only less "back alley serial killer" and more "attack the problem (UA) at the root") or suffered some Cynicism Catalyst that makes whatever they receive in recompense (doesn't necessarily need to be money, after all) more appealing than being a hero.

Potential scene motifs for various traitors

Scenes that would occur in the advent of each type of traitor.

Kaminari the traitor would unleash his super attacks, to which it would seem like he is about to fry his brain and become an idiot. He'd then reveal that he was always playing that weakness, catching an opponent off guard.
Toru would use her non-invisible form, and it would take some time for people to realize who she is.

The traitor is Present Mic and Aizawa's old acquaintance Shirakumo

Or is at least connected to the traitor and the League in some way. Why? Well, when Present Mic first mention him, Aizawa was quick to change the subject. Based on the conversation, Shirakumo might have been like Aizawa and Shinso, a student whose Quirk wouldn't be useful against robots. Then something bad happened that made him unable to become a hero. All For One then offered him a way to get back at the school that ruined his dreams.

Maybe not incidentally, a few months after Shirakumo's name and a glimpse of him were dropped in the main series, Vigilante has started a flashback on Aizawa and Mic back when they were students at UA, showing how they were both close to him. Whatever happened to Shirakumo in the past may shed some light on the present.
Seemingly Jossed; if he's still alive, he's probably Kurogiri.

The traitor is not with the League of Villains but with the Special Abilities Liberation Army

The ideology of the Army is the "liberation" of quirks, the removal of all the regulations so that anyone may use them freely. In this light hero schools, places where only a limited number of people can enter and gain a license to use their quirks (and still only in specific situations), are a symbol of the perceived oppression and a prime target, with U.A. on top of the list. Given how knowledegeable of the League of Villains he appears to be, Re-Destro may have been aware of Shigaraki's hate towards All Might, and discreetly fed the League info relayed from a mole inside the school, leading to the villain attacks, all in the hope of discrediting U.A. in the eyes of the public while also weakening the League. Was this the situation, the mole may also be a misguided Well-Intentioned Extremist and come off as sympathetic and redeemable.

The traitor is Kaminari, and he will give Jirou brain damage to the point of causing Amusia

Kaminari, outed as the traitor, will show more control of his own stored electricity than it seemed, dropping any idiot ruse, and will strike Jirou leaving her comatose. She will recover, only to discover she's been left with Amusia: a musical disorder that appears mainly as a defect in processing pitch but also encompasses musical memory and recognition, and can occur as a consequence to brain damage. Jiro's passion being music, being left unable to enjoy and produce it would break her; Kaminari being the one to cause that would be even more devastating. It'd be pretty bad for the fans as well, as the two characters are frequently shipped.

The traitor may still be one of 1-A students

As of Chapter 242, following the conversation between All Might, Tsukauchi and Nezu, several readers believe it has been confirmed that the culprit is not within 1-A. In truth, the inquiry has been inconclusive: Nezu says they'll know when the League of Villains will make their move. Ever since the Summer Training Camp, Shigaraki and his band haven't taken any action specifically directed against UA, so the mole may be "dormant" and awaiting for new orders, or simply have stopped because of the tighter monitoring. On top of that, his/her identity may be known only to All For One and the Doctor, with no way for Shigaraki to give orders, although the Doctor may now give him access to a direct contact with the mole.

The latter seems the most likely; Shigaraki's never given any indication that he's even aware there is a mole, much less who they are, and in the Training Camp Arc seemingly got his information on where they were going directly from All For One, presumably doing the same when they attacked the USJ. It's possible (though unlikely) that Kurogiri knew, but he was captured shortly after All For One's defeat, leaving him unable to share any information he might have had. If anyone knows, it's most likely the Doctor, since All For One seemingly left him in charge of whatever resources he left behind.

The traitor is a specifically made high end or even a ‘perfect’ noumu that’s not even aware they’re one, that person being Toru Hagakure.

Think about the evidence against Toru for her traitor theory, it explains how she could be incredibly competent and skilled apparently but make a obvious bad lie when talking to Ojiro when he was fighting alone at the USJ, that’s because it’s not a lie. Basically Toru was put on standby mode or something similar when the villain attack occurred and was somewhere else and what she said was the result of her mind being simulated to see what occurred mixed with what she actually saw while when put on “stand by” or “Sleep”. Another thing to note is her rather generic girly girl personality that could of been conjured up by the doctor to make things simple or even more horrifying the doctor kidnapped a young defenseless to be experimented on which explain her intelligence level to other high-end noumu. The biggest clue is that we have already have seen a situation like this already with kurogiri, who didn’t appear to be entirely aware himself. So what’s to stop the doctor from doing something like that again but with a different role, perhaps a observation quirk that what ever a person sees is transmitted to a computer. And the reason Toru is made to always be invisible is to hide her obvious ‘Noumu’ features like kurogiri’s mist. On a meta sense for the audience this traitor reveal would be just tragic for the horror of her life essentially being fake this whole time, instead of a background character being just a villain this whole time, this would have a bigger impact on the audience.Can be made even worse if she is ever switched into attack mode when ever the situation is called for and she is fully aware but is forced to watch herself hurt and murder her classmates with her own hands.

The traitor will be revealed during the arc following the 'Paranormal Liberation War Arc' - and it's going to hurt

So far a patterns seems to be emerging is that the whatever happens in the climax of one saga will provide the groundwork for what Midoriya, Shigaraki and their respective cohorts will learn over the course of the following saga (I.e. Foresight and strategy playing a major part in both the School trip arc and the first half of the 'Rise of the Villains' Arc).

In addition, following the pattern established so far, the climax will comprise of two major LoV-based arcs, both of which will each introduce a Knight of Cerebus to act as the main antagonist(s) - I.e. The Vanguard Action Squad and All For One in the 'School Trip' and 'Hideout Raid Arcs' respectively.

In light of the role that espionage and intelligence gathering has played in the Paranormal Liberation War Arc thus far, it would make sense for the following saga to focus on the subject.

Extrapolating from that, it would make sense for a traitor reveal to take place during the climax of the Rise of the Villains Saga as it would give U.A. a reason to double down on teaching its students how to deal with espionage.

Furthermore, given how much of a game-changer that All For One's appearance was in the 'U.A. Beginnings Saga', it would make sense for the final antagonist of 'Rise of the Villains' would make a similar impact and what better way to upset the status quo than for the traitor to reveal themselves at the worst possible moment for the heroes?

If all of the above is correct, then if the traitor will be the climatic antagonist of the 'Rise of the Villains Saga' and Knight of Cerebus, the reveal of who they are will hit hard. While it is likely that the amount of damage they'll cause to the Heroes will play a major part in it, chances are that the identity of the traitor will be an even bigger gut-punch - probably because it will be a character whom we have gotten to know very well, have come to care for and most likely didn't suspect.

Mezo Shoji is the traitor

Admittedly, I'm basing this entirely off of Shoji being possibly the Class 1-A student we know the least about. He wears a mask, but the reason why is unclear. He has a creepy Parasyte quirk that makes him hideously deformed, but that's a background element at most. It's almost as if Horikoshi has been purposefully avoiding this character for whatever reason, and that reason could be that Shoji has been hiding something from his classmates.

The traitor will be one of Midoriya's classmates who got his letter.

Assuming the traitor's in Class 1-A, then they'll learn about Midoriya having inherited One For All from the letter, and pass that information along to Shigaraki. It's unclear how many people got the letter, but since the group- Mineta, Kaminari, Kirishima, Shoji, Tsuyu and Uraraka- includes people Midoriya doesn't know all that well, it's safe to say that he sent it to the entire class. After this point, it'll likely be a matter of catching the traitor in the act of sending information to the villains.

X is related to Y theories

Izuku And Todoroki are brothers

Think about it, his dad has fire powers and Endeavor has fire powers. It wouldn't be a stretch to think he wouldn't try and sow his oats to make an heir before finding Todoroki's raw talent.
Alternatively, depending on how old Endeavor is, it's possible that Izuku's father is one of Todoroki's older brothers whom Endeavor dismissed as a failure. Making Endeavor Izuku's grandfather and Todoroki Izuku's uncle.
Why would Endeavour want to create a child with a woman who possesses telekinesis? Well if his son can hold people down, then his flame powers cannot be dodged. Which means that short of being immune to fire or just plain super durable, he can one-shot just about anyone.
Jossed, Izuku's father is a man named Hisashi Midoriya.
Maybe not, Hisashi Midoriya may be just his legal name. He could've changed his name for a yet to be revealed reason.

Momo, Ibara, and Mineta are distant relatives

Momo and Ibara have a similar eye shape and eye color. They also have quirks that could possibly be traced back to a similar ancestor. Momo's creation quirk can create inorganic matter from her lipid cells, which is organic matter. Ibara can technically can create organic matter, that matter being the vines on her head. The vines seem to be able to grow quickly, as seen with Ibara's fight with Kaminari in the sports festival. Of course, using this logic could mean a number of characters could be related to Yaomomo, but one person in particular could easily be related to Ibara as well. That person is Mineta. My reasoning? Mineta also has black eyes, and his sticky balls, things that seem to be inorganic, come from a human body, organic matter. Considering that he and Yaomomo bothhave 6/5 intelligence, maybe a high intellect runs in the family. The fact no one addresses a possible relation is because no one knows. They're all,like,fourth cousins, twice removed. It's so distant, you wouldn't figure it out unless you looked at their family trees and specifically looked for a connection.

Izuku is Endeavor's nephew

Given we never see what Izuku's father looks like, he may very well resemble Endeavor. Izuku's father changed his last name to Midoryia because he absolutely despised his brother and wanted nothing to do with him. Izuku clearly got his hair color from his mom, thus why he doesn't have his uncle's red hair (it's possible that Izuku's dad doesn't have red hair, either.) Endeavor doesn't realize he's related to him, and like his son thinks Izuku is the result of an affair All-Might had. Izuku will eventually realize that Tododoki might actually be his cousin (they kinda look similar but it's probably just me .-.) All-Might will probably tell Izuku about it (Endeavor wouldn't care) We never see Izuku's dad, and there's probably a reason for it (besides that he works overseas, won't they like, have a video chat once in a while?) Them both having fire powers doesn't seem like a coincidence, either.

The resemblance between Izuku and Todoroki can probably be chalked up to Generic Cuteness, but this theory is sound given that Hisashi's power is fire breathing, he's never seen, and Inko encouraging Izuku's fanboyism of All Might and desire to be a hero (of course Hisashi Midoriya would want his son idolizing a hero that's the ideological opposite of a brother he hates or fears). Hisashi may well have taken Inko's surname to separate himself from the Todoroki family.

Monoma is All For One's son or descendant

It would explain his Quirk and his arrogant attitude. His power copying is considerably weaker than All For One's if he's his descendant.

His Copy power is somewhat similar to All for One (the power); it relies on other people's Quirks and isn't that powerful on its own. Neito was told multiple times growing up that he could never be a Hero, which is definitely something AfO would espouse. Neito could be at UA to try to escape his father, or as a plant.
Monoma's uniform is a tux. AfO favors nice suits, even in battle.

Kirishima and Tetsutetsu are Fraternal Twins that were Separated at Birth

It's not just their powers that are similar. They also have sharp teeth and share the same birthday. Their parents married so that they could Quirk Breed, much like Shoto, but ended up with twins. When they were young, their parents were killed by a villain, so they were put up for adoption.

Midnight and Yaoyorozu are related

Midnight could be Yaoyorozu's aunt, since she's too young to be her mother, unless she got pregnant at 16 which is unlikely. They look similar enough to be related as they have similar eyes, spiky black hair as well as, body shapes. In addition, their quirks work in a similar way as well, producing matter from their skin, though Midnight is restricted to sleeping gas while Yaoyorozu can produce any non-living matter.

Anima's dad is the Scary Looking Monster with all the other Villains

At some point after All Might and Gran Torino discuss about the possible return of All For One, we see four villains, and one of them is a pretty hulking individual in the middle of a forest. His features are similar to that of Anima, the student he can use his ability to talk to animals. Maybe there's a link between these two?

The hulking individual is probably Gigantomachia, but any link between him and anyone other than All for One is unconfirmed.

The Two Random Citizens in Chapters 91-93

The manga is giving panels to two citizens, a male and a female, and their reactions to the ongoing fight between AfO and OfA. It's possible that they're related to All Might. This is based on a hunch, since there's nothing really hinting about that link. But we are getting scenes of flashbacks from Toshinori, and it does seem like they're invested to a high degree in the fight (then again, everyone is).

The Lightning Villain from the USJ Arc is related to Kaminari

If the theory of Kaminari being the traitor is true, then maybe the skull-masked lightning villain from USJ is related to him. Maybe he's his half-brother that his father sired from a previous relationship (or even while he and Kaminari's mother were married). This could also lead to a reveal that Kaminari's father is a high-ranked hero that he once looked up to, but lost respect for him when he found out he cheated on his mother, leading to him becoming a villain. Heck, maybe Stain killed (or tried to kill) his father, and that's why he said Stain was so cool.

Inasa's father is Endeavor

Somewhere along the line, Endeavor had an extramarital affair, and Inasa was the result of said affair. However, either because Inasa didn't live up to Endeavor's standards of being a proper prodigy, or other possible reasons (including him maybe not even being AWARE that he sired an illegitimate child), Inasa was never recognized as Endeavor's son, and he may hold some resentment towards Todoroki, Endeavor's 'true heir'. The possible evidence for this being his seeming to resemble Endeavor facially, his meaningful glares at Todoroki and his obsession with 'hotness' (I admit though that that last one is a stretch).

Inasa's resentment towards Todoroki is because he remembers the pre-Character Development Todoroki as being cold and revenge-obsessed, basically the opposite of Inasa's ideals of Hot Bloodedness.

Dabi is actually Hisashi Midoriya and it will have a devastating impact on Izuku and Inko when they find out the truth.

Izuku's father was said to "breathe fire". Maybe that's not the half of it. He's instead a user of a Quirk called "Cremation" (let's hope that's not his job). Dabi is severely burnt and disfigured. Perhaps Mr. Midoriya suffered a terrible accident caused by his own Quirk and then left the family, ashamed to show his wife what he looks like now. Said accident also caused problems that prevented Izuku from inheriting his Quirk- or perhaps the accident was caused by said Quirk and Hisashi quietly did something like took a pill or maybe gave a pill to Inko similar to birth control that prevents Quirk inheritance out of fear Izuku might suffer the same mishap one day. As Dabi, he is still sending information and money to his family under the notion that he's abroad, but the money is coming from dirty work as a criminal. The reveal of his true name will serve as a Wham Line and Izuku will be forced to confront the idea of his own father becoming a villain. It will be a very compelling moment in the story to see Izuku confront his own father in the same manner Todoroki deals with Endeavor and a huge blow to him knowing that his own dad has gone down the one path he avoided.

Dabi seems too young to have a high-school aged kid.
Jossed.

All For One is Izuku's father, Hisashi Midoriya

Hisashi is one of if not the most mysterious character. We only know his name, Quirk and that he "works overseas". What does he look like? Why do neither Inko nor Izuku ever talk about him? Is he even alive? Divorced? Honestly, we know more about random background extras than we do about our main character's father! There has to be a reason for such secrecy. And considering that All For One is a Darth Vader Clone and Horikoshi loves Star Wars, this seems like a perfect setup for a Luke, I Am Your Father situation. But lets tally the points!

We never see clearly what All For One looked like before his injuries, but he seems suspiciously similar to Izuku, especially in the anime. Considering that MHA has a Cast of Snowflakes, this can't be just a coincidence.
Many characters have meaningful names. "Hisashi" means "a long time ago". All For One is two centuries old (and we still don't know his real name).
All For One's doctor seems to be the same one who diagnosed Izuku as Quirkless.
According to the Word of God, the winged boy who bullied Izuku was turned into a Nomu.
All For One was able to use Transmission on Bakugo, even though it's only supposed to work on the people well-known to the user.
All For One might be blind, but his senses are good enough to allow him to go toe-to-toe with All Might, yet somehow he didn't notice a bunch of kids hiding behind a flimsy wall ten feet away from him? (Probably didn't want to accidentally kill his son).
It actually explains why Izuku was thought to be Quirkless. It is just that he did not know how to activate All For One, which he might have inherited.
Given Izuku's extensive knowledge of Quirk applications, if he actually inherited All For One quirk, then he would be the most dangerous opponent Shigaraki will ever face.
....You've been reading Conversations with a Cryptid haven't you? I'll admit, it does have some plausibility, but there are several issues with the idea:
- The first of course being Hisashi's established Quirk: Fire Breath. Now, it's entirely possible All For One has Fire Breath among his many Quirks, it raises the question as to why he would limit himself to that one Quirk, and why something as generic as Fire Breath. Yes, it could be to live in incognito from the likes of All Might, but if it was just to be with Inko, he wouldn't need to do that if he just took Inko with him.
- The second is the time from when Hisashi was in the Midoriya's lives and when All Might "killed" All For One. All Might is said to have "killed" All For One roughly 5 to 6 years ago, so when Izuku was 9 or 10. Hisashi's whereabouts are never noted, but the flashbacks to when Deku was first found to be Quirkless, Age 6, indicate that Hisashi was not around in their lives. Whenever Deku is shown as a little kid, he and Inko are always by themselves. So unless Hisashi walked out on their lives long before All Might "killed" All For One, it raises the question as to why he was gone, or gives the implication they are separate people.
- Then there is the nature of the Quirk "All For One". All For One has demonstrated the ability to give others Quirks, yet Hisashi's son, Izuku, remains Quirkless. This coincides to Hisashi's absence even during Deku's childhood upon discovering he was Quirkless. All For One gave his younger brother a Quirk when he was under the impression he was Quirkless, so why wouldn't he give his own son one? It would not be hard to do so, especially with the stigma Quirkless kids have in school, so why wouldn't he?
  - All For One couldn't steal One For All by himself so he must have manipulated events so that Izuku could meet All Might and acquire One For All.
  - Not possible. The events that led Izuku to gaining One for All were all out of pure circumstance. Izuku only got it because he saved Bakugo from the Slime Villain and demonstrated his Heroic Spirit. That only happened because the Slime Villain was in a bottle that fell out of All Mights pants after Izuku grabbed onto him. That only happened after he ran into All Might after being attacked by the Slime Villain. The Slime Villain had been chased by All Might the entire morning, roughly 3 hours at most due to All Mights time limit. So for All for One to have orchestrated any of that, he would have to been responsible for the Slime Villains rampage, known that All Might would be in that specific convenience store close to its rampage, known Izuku would take a path he normally doesn't take home, known Bakugo would have been attacked by the Slime Villain at some point, and known Izuku would just happen to be nearby during the blaze while knowing All Might would just happen to be watching so he could demonstrate his heroic spirit. The only way he would be able to that, without an omnipresent quirk as he hadn't stolen Search from Ragdoll yet, would be if it was an Ass Pull of the highest caliber. No, worse. It would be Aizen level planning.
This troper, firmly believes that this theory may have been true at one point but has been since abandoned by the mangaka potentially because it was too cliche or predictable - or even maybe because of copyright.
- Manga like any long work often read like onions, or tree rings, there is signature, a mark of changes, shifts and abandoned ideas throughout the story. As the plot changes and new ideas are inserted and old ones removed it leaves evidence behind that suggest when ideas or plot points are changed or abandoned. As an example in Fairy Tail The author freely admitted that he planned Mavis Vermilion to be male, likely an old man, before he was apparently told that Mavis is a feminine name, this meant that before that point the whole Zeref/Mavis romantic plot point - and quite possible the reveal that Zeref - the big bad - was the older brother of protagonist Natsu didn't yet exist or other unrelated plot existed in place of it.
- Given all the hinting, little clues, and the author's love of Star Wars; the Luke/Darth Vader parallels between Izuku and All for One are too strong for the idea to not have been considered at some point. That being the case I believe it is an abandoned plot point at this juncture, something left over from an earlier design phase or the first handful of chapters that no longer holds true in series at present. It may simply be that Horikoshi didn't want to go to the trouble of redesigning All For One and removing various old hints and references or perhaps he just liked the character as is and didn't want to change him.
Or we could be pulling a 'Rose Quartz is Pink Diamond' and noticing foreshadowing deliberately put there. Plus, there's the Dramatic Irony of All for One going out of his way to have Revenge Through Corruption on Nana Shimura by raising her grandson to be a villain, only for All Might to pull the same thing on him by complete accident.
- … And yeah, we've been reading too much Conversations with a Cryptid.
If All For One was Izuku's father, the latter should have recognised him when the first user was showing Izuku flashbacks of One For All's creation. That didn't happen, confirming that All For One and Izuku are not related.
- Or that Izuku doesn't remember what his father (Mr. Never There) looks like off the top of his head. He was in a freaky situation and All for One was shrouded in black fog, so he may not have connected the dots.
- Well, All For One has been active for over a century. Perhaps, he went through facial surgery to not be recognized as the same man.
- Or maybe Izuku actually connected the dots and he is in denial, because he can't accept his father being All For One.
- Or maybe he isn't in denial. The story is told by Deku after all, maybe Deku is planning something.
So as the series has gone on more and more evidence of this theory has been piling up.
- For instance, All for One had the perfect opportunity to off Deku and many of the top students of UA's class 1-A during the Kamino Ward Incident but he chose not to. There's no way he didn't sense them behind the wall, he'd just stolen a Quirk that lets him track the positions of people around him.
- Deku's One for All sparks, which are unique to him and haven't been seen in that color on All Might, are a direct inverse of All for One's color scheme.◊ If they were setting him up as his rival's opposite, wouldn't it make more sense to do that with Shigaraki?
- While this isn't evidence specific to All for One and Deku being related, we've never seen All for One's face unobscured, meaning his appearance will be some sort of twist.
- Deku is the first One for All user to directly access previous users' Quirks. This is not because he's Quirkless, because so was All Might. There are only two other characters whom we've seen use multiple Quirks at once: Technically Todoroki, and All for One.
  - That's stated to be a result of One For All itself changing. Besides, how would being All For One's son let him do that? "Deku's Quirkless but he has part of his dad's Quirk" makes no sense.
- Deku being the child of a first generation Quirk user drastically increases the odds of him not having a Quirk.
  - That's not how genetics work. The number of people with Quirks has grown over generations bcause it started off small and it takes generations for a trait to become widespread, not because Quirks were somehow harder to pass along for earlier generations.
- Apparently they reuse All for One's theme when Deku's beating Chisaki senseless?
Again, it appears almost to certainly be a relic from an earlier version of the Story. Beyond the first few prototypes and into the near final draft of the story, there was a central plot point stuck with with every version story: Izuku/Deku was to remain quirkless and the story was of him training to become the first quirkless hero, and that was something that didn't change until the very final draft. In these versions All-Might was just a powerful and famous hero who was to ocasionally pop in and offer Izuku encouragement and on some cases advice or mentorship. According to words from the author, it was only right at the last minute, supposedly only a handful of months before the publication of the first chapter that Kohei Horikoshi's editor made a fateful series of suggestions that would see Midoryia ending up with a quirk and All-Might's no less. This certainly shook up the entire story. But let's look at the Dad for One theory in the light of the "second to last draft". It would make so much more symbolic, dramatic and overall literary sense for the Archenemy of the first ever hero with no quirk and no hope of ever having one, to be his father a man with multiple quirks who can obtain any quirk he desires. I think that all we're seeing is the remains of a plot line like this, the dead end hints and story devices from a previously integral premise that was abandonded far too late to remove all of the foreshadowing and other details pointing to it. We're looking at a ghost, the echoes of what could have or would have been. Indeed the very nature of All For One as a quirk would be an utter anathma to a quirkless hero, a perversion of the entire world order which was already terribly unfair to them. If anything One For All and it's connection to All For One were probably developed later after the decision to give Izuku a quirk was made. Either way, I think after the manga is finished a history of how various plot points were created and how the story grew would be very interesting.
- He has shaggy, wavy hair that's very similar to Deku's hair texture.◊

All-Might is All For One's son

Given we don't know what All For One's name is, he could have the last name Yagi. All For One wanted to kill his son because he saw him as being a failure and a total disgrace for wanting to be a hero, as he was meant to be a minion, and later, successor. (Thus leaving his son to be Quirkless, or maybe he straight up took his Quirk away when he was young, it wasn't as uncommon to be Quirkless in All Mights's generation, thus he would blend in better) All-Might hated his father because he was super evil and abusive. So, he swore that he would kill him. All-Might's mentor, Nana Shimura, passed the Quirk on to All-Might knowing very well they were related so All-Might could finally defeat his father and save the world from his tyranny. As for why All For One's brother didn't pass the quirk on to All-Might, he wasn't even born yet at the time (All For One MUST be pretty old if he lived to see 8 generations of One For All users.) All For One freaked out that Shimura was allied with his son, killing Shimura to prevent it from being passed on, when it already WAS passed on. But he of course found out All Might had it then tried to murder him. All For One swore to never have kids again after what happened with All Might. Instead, he chose a boy that showed potential i.e. Tomura Shigarki.

The last names wouldn't necessarily need to match. If All Might is dedicating his life to fighting his father, he might opt to drop his name. What if "Yagi" was his mother's name?

Kirishima was a failed attempt from Endeavor to create a heir

It isn't unreasonable for Endeavor to have slept around in order to create a heir for himself. Endeavor was already married at the point when he met Kirishima's mom, but none of his current children had shown potential. He slept with her, as Hardening clearly has offensive abilities in addition to defensive ones and combined with fire, would make a force to be reckoned with. Kirishima took his mother's last name, as Endeavor had already moved on to trying for more children with his wife and didn't even bother with his son. Kirishima has his mom's hair color, instead of Endeavor's.

Bakugo and Mina are (distant) cousins

While Mina and Bakugo's Quirks don't seem all that alike, that's because Bakugo's Quirk is effectively a fusion of his parents Quirks. His mother essentially sweats a type of glycerin and his father sweats nitric acid from his hands and in Bakugo they combine to form an explosive, nitroglycerin like substance. Taken on their own either (or both) could be variations on Mina's acid excreting Quirk.

Gran Torino is related to Shigaraki

Think about it. We see Shigaraki move to grab Tsu's face in a puff of smoke. It's possible that Shigaraki's original quirk wasn't Decay at all. Instead, it was Jet. AFO gave Shigaraki Decay, as he found Jet to be insufficient.

Itsuka Kendo and Kendo Rappa are related

Not only do they have arm-related Quirks and matching names, but they have strikingly negative views about bringing a weapon like a gun to a fight.

'Daruma Ujiko' is actually Dr. Tsubasa

I'm not the first one to notice that they look completely identical, it's even on their character sheets. They're both bald, have the same head shape, same mustache, same glasses, same voice actor, and same profession. The Doctor even admits that 'Daruma Ujiko' isn't actually his name. Dr. Tsubasa is also the grandfather of the Tsubasa who is implied to be the Flying Nomu. It would also tie the Doctor in to Izuku's story, as it turns out he was the one who diagnosed Izuku as Quirkless, and open up a lot of story possibilities (was the Doctor lying about Izuku being quirkless, for whatever reason? Was he a family practitioner first, or was it a cover for his illegal activities? Was All for One interested in Dr. Tsubasa's patients for some reason? Why would he consider nomuizing his own grandson?). I'd honestly be more surprised if the Doctor wasn't Dr. Tsubasa.

Pony Tsunotori and Cow Lady (from the Two Heroes movie) are related

Two blonde Americans with horns and cowgirl aesthetics? It's harder to believe they're not. The timeline probably doesn't support the latter being the former's mother, but there's definitely got to be some relation.

My best guess? Cool Aunt.

Momo is Shigaraki's younger sister

As shown in this post

, there seem to be striking similarities between Momo as a kid and Hana, the sister from Tenko Shimura (aka Tomura Shigaraki)'s flashbacks, and between Momo in the present and Nana Shimura, Shigaraki's grandmother. She may have survived the event that killed the rest of her and Tomura's family, and was adopted by a wealthy family also due to her versatile quirk, which is ironically a polar opposite of Shigaraki's (she creates, he destroys).

What makes the theory dubious are the ages. Hana was older than Tomura/Tenko and he was younger than 10 when the tragedy happened, while Momo is at least 4 years younger than him. Unless other factors - beside her having suffered complete amnesia and being practically another person today - are involved, like Momo being in truth older than she looks, or some convenient quirk used to halt her physical growth for some years, it feels unlikely and it may be just due to coincidental similarities in some of the traits used by Horikoshi to design certain characters. As much as he's capable of avoding the Only Six Faces trope more than other mangakas, with so many characters it can happen sooner or later. For the same reason, there are also theories about Momo being related to Overhaul.
- OP didn't say Momo was Hana, she could have been recently born into the family so Shigaraki didn't really have any lingering memories of her especially since as a baby, she didn't contribute to his suffering.
After chapter 236 this theory can be put to rest, unless one wants to theorize memory alteration, so not everything we see in Shigaraki's flashback really happened.
- There is a way the theory could still work. Kotaro may have had a brief affair with Momo's mother a few years after Shigaraki's birth. This led to Momo's conception, which he never knew about. Mrs. Yaoyorozu went on to give birth to Momo, whom she raised under the belief that her father is a different man because she was too ashamed to admit her daughter is the product of an affair (she is married or marrying into a wealthy family at the time, after all). Either way, this would make Momo the half-sister of Shigaraki, rather than his full-sister.

Momo and Shigaraki are related, but more distantly

Nana Shimura was the sister of one of Momo's grandparents. She may have been estranged from her family, either because they didn't approve of the man she had decided to marry, or because of Nana's own choice as wielder of One For All, to protect them. The same reason likely prompted her to not reveal the true reason of her husband's murder, leading the relatives to suspect it was because of involvement with organized crime and causing further estrangement.

Momo may have never heard of this great-aunt who, from her relatives' point of view, had ended up tangled in something suspicious and ultimately disappeared mysteriously. And if she did, she wouldn't have enough elements to deduce any connection with Shigaraki anyway.

Inko is related to Nana

She's probably Nana's daughter, making Izuku her grandson and Shigaraki's cousin. All Might notes Inko looks like Nana, as does Midoriya when he meets her. In Tenko's flashback, his father appears to use his Quirk to draw a garden tool to his hand. Inko's Quirk also lets her draw small objects to her.

Inko could also be a cousin of Kotaro, seeing as no mention of a daughter exists.
- Alternatively Nana made sure no one knew of her daughter so AFO couldn't track her.

Kirishima is related to Gigantomachia

My personal bet is on Gigantomachia being Kirishima's estranged father, but I'm willing to go with uncle, cousin, or even grandfather (since we don't know Gigantomachia's age). Gigantomachia's silhouette looks very similar to Kirishima's Unbreakable state, his hair is styled rather similarly, and they have pretty much the same teeth. We don't know the details of Gigantomachia's quirk, but we do know it makes him incredibly durable and strong, similar to Kirishima's. In addition, the run-in with Ashido and Kirishima in middle school seems like the two are fated to meet again, this time with Kirishima confronting his fear. Perhaps similar to the "Kirishima is a failed Endeavour child" theory above, Kirishima was an atttempt by All For One to create a second Gigantomachia, but the child only showed a fraction of what Gigantomachia could manage, so All For One had Gigantomachia abandon the child and his mother. While Kirishima may mention having more than one parent at some point, the only one he has specifically talked about is his mother (who he says told him about how he got his eye scar), so that leaves open the possibility that his mother may have found a new partner/spouse after Gigantomachia left.

Geten is related to the Todoroki family

Namely from the family of Rei. Knowledge of how Endeavor treated Rei (or even before that, the simple fact Rei was forced into a Quirk Marriage) led Geten to hate the hero system, thus falling into the propaganda of the MLA to the point of meeting Re-Destro and becoming a personal favorite of him. With the extremely popular theory that Dabi is Rei and Endeavor's oldest son, it'd made the Todorokis even more of a Big, Screwed-Up Family.

Dabi is related to Endeavor... but not as his son

Dabi is actually Endeavor's nephew. We do not know much on Endeavor's past or his family despite the Todorokis being a large glimpse into it. It's possible that he may have a sibling or siblings that could bare someone like Dabi. Maybe Endeavor's sibling was actually a criminal and he had to put them down as a hero, thus causing Dabi to resent him and the family.

Jossed, he is Endeavor's son.

The Todorokis are descendants of Zuko

Is this because of Todoroki Shoto's scar, fire abilites and both daddy and mommy issues? Yes. However, considering how rare elemental quirks are, it's likely Endeavor comes from a long line of powerful firebenders. Also if the Dabi is Todoroki Touya theory is true, his blue flames may be an inherited trait from his greatx-aunt Azula. Rei herself probably comes from a strong family line of waterbenders (maybe even Katara's descendants, if any of her airbender grandchildren or their descendants married back into the water tribe), perhaps even Rei's ancestors were waterbenders that grew to specialize in ice. It's probably this knowledge of powerful lineage that lead to Endeavor and Rei's quirk marriage.

Todoroki and Bakugo's drama CD assailants are Mineta's relatives

In one of the drama CDs, Todoroki and Bakugo are harassed by a villain who uses his Quirk to stick them together, forcing them into various positions of close-contact while taking pictures of them. His brother winds up doing the same thing to them by repeatedly freezing them in place; he even starts to cut their clothes off. It probably doesn't help that the two men are implied to have a sister. Given how the brothers behave, and how the first one specifically has a Quirk that sticks people together, it's possible that they could be related to Mineta. Either one of the brothers is his dad or their sister is his mom, they behave in ways very reminiscent of Mineta. We aren't given a proper designation to their appearances or names, let alone their entire family, which is arguably the worst part. If Mineta turns out to come from a whole family of sexual predators, it would both explain his behavior and — considering they were sent by the League of Villains — offer grounds that Mineta could in fact be the traitor of U.A. High.

Momo is related to Overhaul

Vigilante

Toxic Chainsaw will be either an Arc Villain or even the Big Bad of the spin-off, a la Kihara Gensei from A Certain Scientific Railgun

The main conflict seems to be revolved around the drugs that enhance Quirks. As such, Toxic Chainsaw might be able to use his Quirk for producing them, depending on how his Quirk works (and possibly turning him into an Evil Counterpart of a sort to Mina Ashido).

Overhaul and his crew will make an appearance

Or simply be a Greater-Scope Villain given the recent information about the Quirk-enhancing drugs. Maybe he will be The Man Behind the Man for the Arc Villain.

Kendo Rappa appears in Chapter 86 but it's set several years prior, when he fought in an underground ring and he hadn't been defeated and recruited by Overhaul yet.

The Big Three will make an appearance

Cue to Hilarity Ensues when Knuckle Duster mistakes Tamaki for a villain.

The Vigilantes will eventually show up in the main series

With the Quirk Enhancing Drug making an appearance, it's possible to see Izuku and Knuckle Duster have a conflict of ideals.

Kuin Hachisuka was the Number Nine of the organization that spreads the Trigger drug

Though not stated outright, after the reveal of Number Six it's easy to go back and notice her name contains the kanji for the number 9. It also explains easily why her peculiar aspect, since she apparently was just a big parasitic wasp - she was never human to begin with, and like Six she was the fruit of lab experiments.

by the end of Vigilante the research that created Kuin and Six will be discontinued

The laboratory that produced them will be seized or destroyed, or All For One and the maker of those creatures (possibly the same doctor we know from the main series) will not deem them good to produce anymore, due to both a long time to grow them and their higher intelligence and autonomy, which is a double-edged sword. They will consequently concentrate on the stronger and easier to control Nomu, leading to the main series.

The underground fighter Drunken Lee is Hisashi Midoriya

In Chapter 86, a flashback introduces us to the underground fighting ring where Kendo Rappa used to fight. Before his appearance, however, we are shown a fight between a wolf-man mutant and a guy in a chinese attire called Drunken Lee; the latter wins thanks to his fire breath - a quirk that is known to belong to Hisashi Midoriya.

If Izuku's father was a deep cover agent whose job doesn't allow him to communicate easily due to the risk of blowing his covers, it would explain why he's been such a ghost in Izuku's life, and him working abroad would be just a cover story. Inko may not know the truth either, or know and been asked by Hisashi to keep it secret, or know and have decided on her own to hide the truth from Izuku, whom she felt was already quite affected by his being quirkless to know about his father. Hisashi having sacrificed staying on the side of his son while he was growing up in exchange for such a dangerous job, may also prompt Izuku to better understand Shigaraki's resentment towards heroes.

Finally, there's a precedent in Vigilante itself. The flashback arc about Aizawa presented us Oboro Shirakumo and his death, and just one month later the main series had the shocking reveal of him being Kurogiri. Likewise, this other flashabck may introduce some character that the main series will eventually explore further.

Just for fun

Endeavor will have an Oh, Crap! moment

And in that moment, his flaming beard will burn out. Why does that sound familiar?

Tiger & Bunny is a Prequel

Tiger& Bunny happens in the shows past and is about the 2nd/3rd generation of heroes. As superpowers became common, "NEXT" devolved into a derogatory term and the term Quirk was used to replace it. Outright corporate sponsorship was outlawed, but hero agencies still draw in lots of advertising dollars from TV and print appearances. As the number of people born with quirks rapidly increased, the older generation of heroes founded schools like UA.

Something will disable Hagakure's invisibility and render her visible

Not only will we see what she really looks like for the first time... it will overlap with Please Put Some Clothes On.

Toru will be rendered visible....but we still won't get to see what she looks like.

We'll either only see her classmates' reaction to her or with her body and face obscured, and by the time she reappears back on-panel, she'll be invisible again.

MHA takes place in the Worm-verse

Pretty much Exactly What It Says on the Tin

Endeavor is actually Bono

Who else would get so upset about being number two?

Toru Hagakure actually does wear a costume

Going along with the above theory that she will be rendered visible, it will also come with the discovery that Hagakure does have a costume she wears, it's simply as invisible as she is. We know that there are laws in place to prevent costumes showing too much skin, with heroes like Midnight and Yaoyorozu being close to that limit due to the nature of their quirks. Because of this, it should be unthinkable that Hagakure goes around naked, invisibility or not.

At the same time, we have Mirio Togata, who runs into similar issues since his clothes don't phase with him. His Lemillion costume is made with fibers that have his hair woven into them so they can go with him when he phases through objects.

Hagakure does indeed have a proper hero costume; one woven with her hair in its fibers like Togata, so she can be both clothed and invisible. The visible boots and gloves she wears aren't the only things she wears. They're a deliberate design choice so she can be located out of combat.

Kirishima is a fan of JoJo's Bizarre Adventure.

He has a strong admiration for manly resolve, and admits that his idol, Crimson Riot, embodies "old school" values of masculinity, which sounds like the earlier parts of Hirohiko Araki's iconic series. Plus, the anime had this

happen during his fight with Cementoss.

Tokoyami is related to Zato-1.

Look at Dark Shadow tell me that's not similar to Eddie.

Favorite ice cream flavors of the main characters

Deku: Mint

Bakugo: Cinnamon

Uraraka: Bubblegum

Iida: Vanilla

Todoroki: Blueberry

Hangry Bakugo is hard to tell apart from regular Bakugo

One key difference is that he'll try to end the confrontation quickly then if it was Bakugo's simple trademark anger. Another key difference is that he'll insult other people's food preferences.

Let's rename the heros so they make sense in english

Aoyama - Bright Knight
- It's just too obvious. Besides it sound infinity cooler than I can't stop twinkling.
  - He changed it to "Can't Stop Twinkling" already.
Midoriya is still Deku
Ochaco will keep Uravity
Ingenium/Ida - Make it Engenium. That way it's a pun.
- 'Ingenium' is already a reference to the Ingenium engine family. The Iidas are an engine-quirk hero family, it fits perfectly without being too on the nose.
Red Riot still sounds OK in english so we'll keep Kirashima
Invisible Girl might be copyrighted so let's make Hagakure Unseeable (Her Hero name)
- Considering they kept it in the English Dub, Copyright isn't an issue.
Shoji - Armee
Most of these don't need to be changed for several reasons.
- 1. They are all Japanese In-Universe, so changing them to English words would make no sense.
- 2. The Dub already aired the episode they named themselves in so any names they had were still maintained even if they only truly make sense in their native tongue.

Aizawa is a Crazy Cat Lady

Exactly What It Says on the Tin

Deku is allergic to cats.

Exactly What It Says on the Tin

Aizawa is surprisingly lenient about bathroom breaks

Unless he catches you loitering, in which case he'll not allow you to have any for the rest of the month.

My Hero Academia is the future of the X-Men's world.

Quirks are obviously the same thing as mutations in the Marvel Universe. So many of the official possible futures we've seen of the X-men's world are horrible and dystopian. My Hero Academia is one future for them that isn't awful. As predicted, mutants really were the next step in human evolution and mutations have become more and more common... and society has adapted and things are mostly okay.

Everyone actually looks like anime characters, in universe.

It's an almost universally inherited mutation quirk (so common, in fact, that anyone who has only it is considered quirkless), and most people who don't have it have a different appearance-altering quirk. Normal (to the real world) looking people are a rare and weird exception.

This may strangely be canon, funnily enough. In-universe, the characters had the same Uncanny Valley reactions towards the creepier side of Mutations as we, do viewers had. So it's extremely likely that all that Medium Blending truly is what they look like in-universe.

Midoriya and Bakugo will have their bodies fused somehow, and this way become the Number One hero together.

Their hero name will be Bakudeku or Dekubaku, for added measure.

"Dekugo" might flow a bit better as a fusion name.

Mei Hatsume is a Genius

A Staunen Artificer, to be specific, with dots in Prostasia and perhaps Skafoi. Her inventions go haywire because of Havoc; the reason they don't regularly do this is because the world of Quirks is strange anyway, which gives Inspired creations a good measure of protection, and the tamer ones can be reliably used as support equipment.

Mount Lady will encounter another female hero with a similar quirk.

But it will turn out that the other heroine's gigantification quirk is superior to Lady's in every way: she can adjust how much she grows, it grants her a level of invulnerability, and her maximum height is greater than Lady's. In a bit of karma, the new hero will end up upstaging Yu in some way and leave the latter jealously sulking.

My Hero Academia is the future of the Overwatch world.

The reinstated Overwatch took down Talon, however the world was never rid of villains. The members at the time, both old and new, recognized their time as heroes was coming to an end, so they eventually set up hero schools all over the world to teach young heroes with big dreams to follow in their footsteps and make the world a better place. (Hanzo and Genji Shimada founded UA) Thanks to technology, DNA altering and other things, some kids ended up mutating and developing quirks. Overwatch's name faded as time went on, but the schools remained and developed more and more to help kids with quirks.The robots test to get into UA? A nod to the Omnic crisis struggles in the past.

My Hero Academia is the future of Avatar: The Last Airbender.

The arts of bending was sadly lost after many centuries and eventually the world may have reached a point when the Avatar was no longer needed or worse, the Avatar cycle ended. However, as time went on, bending abilities remained dormant, but they also started to evolve. Some other elemental abilities emerged, while others may have been watered down. Kirishima and Tetsutetsu's quirk is a legacy of earthbending. Todoroki's ice quirk from his mother is the result of some waterbenders that became ice specialists while his father's quirk may have been something that somehow managed to stay. Bakugo's explosion quirk is likely a firebending legacy as well.

Somewhere in far off, distant, small islands unknown to most of the general populous, animals with quirks have been discovered

Many seem to have received a quirk tied to a certain element. Even more so, some plants and manmade objects have achieved sentience and quirk abilities. Little do most of the people know, these animals with quirks would evolve. They'd learn more abilities and powers, and expand beyond their quirks in the beginning. Professors grew very invested in researching them, and some quirkless people considered, what about capturing and training them? This, was the beginning of Pokémon.

There is a green plant that looks like Deku's hair

And somebody will mistake that plant for Deku before seeing the pot. Also, Izuku's hair might be mistaken for said plant and somebody might water his hair.

Deku is Gaster

Others

The intro (in the anime) for the my Villian Academia (Meta Libaration War arc) will be a Dark Reprise of season 1's intro

Exactly What It Says on the Tin

Shigaraki (and to a lesser extent an Expy of Marshal Law

Also Stain is The Boys

The final volume will have a green cover

The First volume had a yellow colour for All-Might, Midoriya's Colour Motif is Green, this will show the torch has been passed and Midoriya has achieved his goal of number one hero.

Bakugo's hero name will be "Kacchan"

When his character development has gone full-circle, he will accept "Kacchan" as his hero name the same way Izuku accepted "Deku" as his.
- Unlikely, Kacchan sounds too cute for Bakugo to accept it as a hero name (although he doesn't mind being called Kacchan, he has been shown to prefer more violent names, which unless he starts liking cute stuff more, won't really change.) Deku actually has meaning to it that would apply to heroism (never giving up) while Kacchan is just a nickname.
Alternately, his official hero name will be Ground Zero, but Deku calls him "Kacchan" in an interview or something, and it will catch on so badly nobody actually calls him Ground Zero.
This comes from a post I read on Tumblr actually. And it does make sense, Izuku is a Magnetic Hero that his classmates change and found a new peace and hope for the future and the points the post make actually brought some light to what if no one acted right then in several turning points of Izuku's life. And with some fridge brilliance in mind, it goes a long way. Green, Izuku's color, is often associated to traffic lights that gives you a sign that you can now move forward and, in several RPG'fs, healing effects are cast as green, and gives some chance that you can survive more hits to go on with the game. And to go further, in heraldry, green can mean hope and growth.

Deku, Symbol of Hope

Deku will become a symbol for a bright new age of heroes in the series current Darkest Hour after All-Might's retirement.

A second part to the above entry: Bakugo, Symbol of Courage

A follow-up similarity that will be towards the above case, is Bakugo. It's noted by Aizawa that along with Midoriya, Bakugo is also a driving force to the class. And, where Midoriya brings hope and encourages others to hope as well, Bakugo similarly pushes others in a different way, that of Courage. As brash and rude as he may be, he pushes the marker as a shining example of unrelenting courage and, knowingly or not, inspires others to push it as well. From Midoriya saying how he looked up to Bakugo whilst following and growing up together, to Uraraka willing to go all out on him, Kirishima pushing to go rescue him despite the rules and Kaminari's attitude during the provisional license exam, many of his class similarly are stepping up in the face of danger or challenges with him being the reason why they strive to step up.
To add to this a little further, there are two other major incidents that showed more hints about this: The exam against All Might with Midoriya, and being captured by the League of Villains. For the first, Deku, who both worships and is completely certain upon their inability to win head on, in the end doesn't just flee for it as All Might notes he can, but turns around and makes an attack. Because Deku convinced Bakugo to keep the idea of them having a shot at winning in mind, compared to his initial claim that he'd rather lose. The second, surrounded and in the League of Villain's very base, he calls them out on it on his own, showing that even in the face of almost certain defeat, one he knows he can't win against by how he reacted when they tried to re-capture him, he still holds no hesitation to his courage to stand against the odds. Where Izuku is the one who will keep people hoping and working for the best, Bakugo is/will be the force to push them to continue striving for what they aim for despite the slimmest of chances.

The source of Dabi's burns

If the above mentioned theory that Dabi is indeed Touya Todoroki true, then what could have caused his burns exactly. If Endeavor's comment on him inheriting his mother's "weak constitution", is anything to go by, the most logical take on it is that as powerful as his flames are, Dabi/Touya is not resistant to them. This could be expanded on as well, as Natsuo Todoroki comments that he feels rather sensitive towards warm weather; which hints at his own Quirk.It also counts into Endeavor's reason for having married Rei in the first place. As he wanted/needed a child to have the perfect balance of a fire Quirk and an Ice Quirk. it has been explained that if Shoto uses his ice too much, then he will suffer from frostbite, and there are implications for something similar to happen if he uses his flames too much. Endeavor's Quirk, Hellflame will rise Enji's body temperature to dangerous levels if overused due to successive powerful attacks or drawn out battles, impairing his physical abilities. So, it's quite likely that Touya/Dabi's burns might have been a result of his dangerous Quirk.
Or he could have burned himself deliberately in an effort to hide his identity. All of his burns are completely symmetrical. Burns are not so exact in nature. Along with dying his hair jet black, he may have done it to further distance himself from Endeavor and his family.
- Another theory is that his burns are a direct result of trying to copy Endeavour's iconic fire mask. The burns appear to be concentrated in similar locations to where Endeavour's mask covers...

The anime will eventually have a version of You Say Run called Run For All

Considering You Say Run got an updated version for the second season called Jet Set Run, it'd only be appropriate if future seasons also got remixes of the song. This may possibly even show up as early as Season 3, and play when All-Might takes on All For One. Also, Just for Pun.

It might even be saved for the Final Battle between Midoriya and Shigaraki, :with all the Vestiges of the former One For All users somehow either manifesting in the real world, or fusing with Midoriya to empower him, or something equally symbolic of 'One for all and all for one'.

David and Melissa will appear at Nighteye's funeral in the anime

Since the former was once All-Might's sidekick, it wouldn't be too far off if he and Nighteye knew each other.

After the events of My Hero Academia: Two Heroes, Melissa's work was confiscated

It's the reason her special gauntlet, which would have been incredibly useful to Deku, cannot be made anymore; while created for him and with all the best intentions, the government is afraid that its technology may fall in wrong hands and be reverse-engineered to provide villains with an instrument to overcome the limitations of certain types of offensive quirks. You cannot even blame the governments because of what just happened with a tech her father David had conceived to help All Might. The flipside is that, once investigations verify that she had no knowledge of David's actions, much less complicity in them, most of Melissa's inventions will be given back to her, and she may be even offered a position by the government.

The Pretty Yure Magical Girls are real

In Chapter 137, one of Overhaul's henchmen is buying toys for Eri, and they are based on a Magical Girl team called Pretty Yure 10, a reference to the Pretty Cure franchise. The scene heavily hints that the team is fictional because it's based on a long-running series, but don't get surprised if later, we find out the Pretty Yure team exists as superheroines with quirks, with the explanation that there's an anime series based on them.

Melissa will become Midoriya's tech support when they are adults

She's shown to have an excellent grasp of how Midoriya's quirk functions and so could make him excellent gear suited for him and his style of fighting. They worked well together during My Hero Academia: Two Heroes, and given their predecessors' partnership, they might continue this in the same Passing the Torch sense as their careers as a hero and scientist, respectively. Furthermore, it's implied that she suspects a deeper connection between "Uncle Might" and Midoriya then teacher-student so she could be a Secret Keeper.

The Meta Liberation Army arc will fully embrace its other name in the anime

That name being "My Villian Academia" and we can expect things like

Shigiraki and All for One replacing Deku and All Might in the intro
The intro being a Dark Reprise of a past intro
Most of Class 1A being excluded, with those present in cameos

There will be a Villain Song

Or something close to it, like a hero or a more neutral character, that doesn't have ill intent, but will have a musical number similar to how many villains in media do. It could also come from a character that is only Ambiguously Evil.

WMG / My Hero Academia

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