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    Fridge Brilliance 
  • When Izuku was little he thought of choosing a hero name similar to All Might's, who he always idolized, but when he grew older and had to choose a hero name he thought he is not worthy of it yet so he chose Deku with the meaning "Give it all." Basically, in order to achieve all the might he can have he has to give it all.
  • There may be a more pragmatic reason behind Hawks' decision of giving Twice a chance to surrender, Hawks wants nothing more than to live in a society where heroes have more time than they know what to do with and he saw Twice as a perfect tool to achieve that dream. If Twice had chosen to surrender and allied himself with the heroes, he could lower the crime rate by creating clones of top-ranking heroes and thus give Hawks the freedom he always yearned for while in his perspective redeeming a man's broken life. No wonder he tried so hard to convince Twice to change sides!
  • A rather inspiring example: Keigo Takami's parents were desperate and cowardly people who spent their lives blaming others for their problems and using their quirks to dodge the law. When he becomes Hawks, he registers his Quirk as "Fierce Wings", signifying his resolve to take life head-on.
  • Of all of Bakugo's peers, despite being the weakest in terms of power Sero is the one least afraid to mock him and take advantage of his character flaws rather than Childhood Friend Deku, Class Clown Kaminari or Rated Mfor Manly Kirishima. This might seem weird but it fits his role as a Spider-Man expy.
  • Now that Monoma knows One for All is a power stockpiling Quirk rather than a power generating Quirk, Izuku has the perfect excuse as for why it didn't "develop" until so late in his life. After all, how much power could he have reasonably stockpiled at age 4? It makes sense that a Quirk wouldn't express itself until it became viable as an actual ability, and would lie dormant until that point.
    • This also puts into view the possibility of Quirks that manifest much later compared to the majority of the population. All Quirks work differently and operate on their own mechanics. As such, there may be several individuals whose abilities didn't become apparent until much later in life.
  • Meta-wise, it makes sense that Horikoshi decided against making Izuku a straight out Quirkless hero and chose to make him the successor of All Might. Often, the powerset of the hero influences the style of stories one tells about him or her and the environment in which the story is set, two notable examples of this are Superman with Metropolis and Batman with Gotham. Had Horikoshi made Izuku a Quirkless hero, he would have been forced to compensate both in equipment and attitude to keep up with the other heroes, impacting the tone of the story and making it more cynical and less hopeful, which was not what Horikoshi wanted. This can be noticed in the prototype sketch of Izuku back when he was going to be a Badass Normal hero.
  • For much of the early part of the series; Midoriya struggles with using One For All, injures himself in spite of having All Might's guidance, but then rectifies these issues once he trains with Gran Torino. All Might calls his instructing inadequate, but it's likely more complicated than that. Gran Torino states that Midoriya and All Might have contrasting personalities, but he also acknowledges that All Might figured out the Quirk much quicker than Midoriya did. It wasn't that All Might was bad at instructing Midoriya, he simply didn't understand the hurdles that his pupil was going through.
  • The first person to pass on One For All had a latent Quirk that allowed him to pass it onto others. At first glance, it might seem like an incredibly convenient plot device, considering how weak and unnoticeable it is. However, it's not that far-fetched at all, and in fact, makes perfect sense. As shown in-story, Quirks are hereditary, meaning that parents can pass on their Quirks to their children. His brother has the power to steal Quirks, in addition to the power to grant them. Him getting the latter Quirk, but not the former, thus makes complete sense.
    • You could also say that this is why the later users of One For All can use their predecessors Quirks - One For All is essentially stealing them for its own use. In truth, both All For One and his brother actually had a very similar quirk its just that one had a crippling flaw that was only remedied by the unnamed power-stockpiling quirk that he was given.
    • The difference between the two 'twin' quirks is best illustrated in the terminology used when they're adapting new quirks into themselves— AFO Absorbs quirks, thus non-consensually stealing what others own and demonstrating total control over whom the targeted quirk is granted to, OFA Assimilates itself into other quirks, passively submitting itself to the will of the quirk holder it transfers to, and bringing along the Quirk factor with it when it's voluntarily transferred to another, thus leaving control in the hands of the target the entire time. In truth, the power-stockpiling quirk wasn't strictly necessary for Yoichi to create OFA with—it merely allowed him to realise he did possess a quirk of his own, once he assimilated a quirk with a visible effect into his own existing quirk, but he could have passed on OFA without it, though it wouldn't have had an effect until the Second Holder passed it on.
  • While Bakugo's horrified reaction to Todoroki's reason for existing is justified by how disturbing it is — another part of it could easily come from him seeing the kind of person he could turn into over his obsession with becoming Number 1.
    • Also, his own Quirk is the merging of his two parents' Quirk into one that is much more powerful and 'heroic'. It was probably unsettling to him on a 'that guy's me but played for sinister' way.
  • The name "One for All". At first, it might seem weird since it's actually a sum of many people's powers held by one person, suggesting that "All for One" might be a more appropriate name. However, taking into account All Might and Midoriya's personalities, it can be interpreted as "One person's power for the sake of All others". Also, it's a power that has been held by several people (with Midoriya being the ninth user).
    • It ends up making perfect sense, when following The Reveal of "All for One" as the name of another Quirk — one which enabled a powerful villain to selfishly hoard many other Quirks for himself.
    • Also, it fits in that it's "One power for All people", in that it's a Quirk which can be freely passed on to anyone, from a Quirkless kid (Deku), to a person who has proven themselves worthy with their own Quirk (Mirio)
  • Todoroki's costume completely covered his fireside with what looked like ice. Considering how he hates his father's fire powers, and vowed to never use that side of his in battle, this makes perfect sense; especially considering how he later gets another costume change, one more suitable, after having accepting his flame powers.
  • So far in the series, we have plenty of confirmation of Midoriya being worthy of One For All as All Might's successor, especially based on how he rushes into danger if it means helping people. But there's also the fact that several of his classmates are starting to be inspired by him as well. Todoroki is motivated to get over his anger toward his father to better himself as a hero, Bakugo is encouraged to start working with others if it means winning, and even Mineta is able to get over his perversion and cowardice in order to win against a much stronger opponent on his own. Just like All Might was an inspiration and a symbol of peace to others — Midoriya is starting to change a lot of people around him for the better.
    • This ability to inspire people to do better was even seen at the very beginning of the series; when his reckless attempt to rescue Bakugo convinced All Might to defy his time limit, despite the risk to himself, and save the day.
  • Aside from Super Speed and Super Strength, One For All also apparently grants the user Enhanced Durability. How does this happen? Simple. One For All's massive backlash punishes the user with extreme pain (broken bones being very common), but over time, this helps the user build resistance to massive amounts of pain. So, All Might being able to tank just about anything isn't inherently granted by the Quirk. In fact, it's a long-term by-product of his Quirk after years of wielding One For All.
  • Uraraka's weakness; namely that overusing her gravity-cancelling powers, or applying said powers to herself (which ends up causing her extreme nausea), actually makes a great deal of sense. Nausea is a common symptom if in zero-gravity conditions. There's a reason why the aircraft used to train astronauts for zero-gravity conditions, are collectively called the Vomit Comet, after all. When using this power of such a Quirk on herself, Uraraka is consequently then exposing her body to a zero-gravity environment.
  • Bakugo telling Todoroki before their match at the Sports Festival that he'll "hold down his flames from above", since Todoroki had just started using them at that point. It's sounds slightly out of place, because he could have just said "I'll hold you back even if you use your flames". Why "from above"? Until we get to the last few seconds of their fight, and Bakugo pulls out Howitzer Impact, where he comes at Todoroki from above. Not only that, but the vacuum he made from using the move would have put out Todoroki's flames, so Todoroki putting them out himself from a traumatic memory took away a chance for Bakugo to prove himself to everyone that he's as good as, or better than Deku.
  • Uraraka learning how to fight hand-to-hand seems like a suitable skill for her to learn to enhance her offensive capabilities. In what we've seen so far, though, this mostly seems to be limited to grappling and submissions. However, considering that Uraraka's Quirk allows her to reduce an enemy's weight to nothing, it's no wonder that grappling would be a fantastic fighting style for her.
  • Tsuyu's unusual face, namely her big wide eyes, solid oval pupils, and a V-shaped smile, is yet another frog reference: She resembles the Sanrio mascot Keroppi. This also ties in to her chosen hero name of "Froppy".
  • Shinso has Mind Control as a Quirk. On the surface, it certainly seems like a power only villains should have, but he'd be really good at beating whole hideouts full of villains by just kicking in the door and shouting pretty much any phrase that comes to mind. Whether he says "Your criminal days are over!" or "Did anyone order pizza?" doesn't matter; the instant everyone in the hideout yells, "Get 'im!" Shinso wins.
  • One thing that's pretty interesting about My Hero Academia compared to other Shōnen series is that the arcs are very fast-paced: as of this writing, eight volumes have been published with a ninth coming soon, and each one roughly covering one whole arc (cliffhangers notwithstanding). This isn't just Horikoshi being good at pacing arcs, it's a reference to Superhero comics usually being collected in trade paperbacks, with one roughly complete arc collected into a roughly standalone volume!
  • Todoroki is more like Endeavor than he realizes, in that in most of the competitions and exams he's ranked second. Second in Aizawa's Quirk evaluation exam, second in the sports festival, and second in his first term final exam. And with the introduction of Inasa, he's most likely ranked second among those who took the recommended student exam. He's even ranked second in the popularity poll!
  • When Kaminari describes Bakugo's personality as being like "crap steeped in sewage" it's not just a colorful simile. Soaking feces in urine is an old method to produce saltpeter, an ingredient in gunpowder.
    • Bakugo is also very likely to have intermittent explosive disorder, a behavioral disorder characterized by explosive outbursts of anger and violence, often to the point of rage, that are disproportionate to the situation at hand (e.g., impulsive screaming triggered by relatively inconsequential events).
  • Camie didn't get the usual square with her name and Quirk during the first License Exam Arc because we didn't meet Camie.
  • Overhaul keeps talking about illnesses and cures in his first appearance. It's quiet befitting of his theme.
    • Almost a Genius Bonus: They are first shown burning the car of those they consider ill; it was common for the doctors to burn the bodies of bubonic plague victims.
  • In a flashback we see Mirio with a ponytail while in the present he has short hair, His suit is made with his hair woven in, It probably just hasn't grown back fully yet.
    • Alternatively, the ponytail was specifically BECAUSE he was growing his hair out for his suit, and needed a way to keep it from getting in the way.
  • In the first page of Chapter 117, as Midoriya and Bakugo leave the dorms at night, we see four students asleep in their rooms, Iida, Todoroki, Yaoyorozu, and Kirishima. Though it may appear to be simply a random group of students sleeping to demonstrate how late it is, they are also the group of students that went to save Bakugo during his kidnapping. Given the content of the chapter, it could serve to highlight Bakugo's character development throughout the series so far.
  • They say you subconsciously find romantic partners with similar traits to your mother. In Izuku's case, his mother happens to have gravity-related powers. Guess who the primary love interest's powers involve?
    • Adding to it is that Ochaco looks a little bit like Inko when she was young and thin, mostly with her haircut.
      • Adding to that, Ochaco is somewhat chubby as well. Not saying Midoriya is a Chubby Chaser, but...
    • Same goes for the opposite with similar traits to the father. Izuku's father's related to fire, as is his rival.
  • Why doesn't All For One steal every single Quirk he can get his hands on? Because doing so would actually be detrimental to him. Quirks like Best Jeanist, Edge Shot, or Mirio's require intensive training to use at their full potential. Taking Quirks like theirs would just be a waste of time, seeing how long it would take to use the Quirk at its best. And then there's Quirks that either permanently mutate the user's body, like most animal-related Quirks, or are too dangerous to have, like Overhaul's Quirk. The best Quirks to steal, therefore, are simple yet incredibly useful Quirks like Ragdoll's or Quirks to later give to a Nomu.
  • Some of the teachers like Aizawa and Midnight seem somewhat out of place in a class setting teaching kids, but something to consider is that a lot of heroes are fairly active during the day. Aizawa is stated to do a lot of his hero work at night, and it's likely a similar story with Midnight. Thirteen is a rescue worker, who would mainly be active during disasters, so it's possible a lot of the teaching staff was hired from a pool of heroes who aren't active during school hours.
    • It also explains why Aizawa is perpetually exhausted looking and sleeps in his classes a lot. The guy probably doesn't get much rest considering how much of his fighting style emphasizes heavy martial arts mixed with his eye straining Quirk. Conversely, Midnight being generally better off can be easily explained by her Quirk enabling her to subdue criminals more easily without needing to resort to extreme movement and combat, and her preference for non-fatal/physical methods and friendlier disposition (as is shown in both the series and Illegals) likely means she tends to finish things pretty quickly and with the villains probably either surrendering non-violently, thus giving her more time for rest.
    • It's also likely to ensure that heroes in training get exposed to a lot more types of heroes than the flashiest on the street. Why have a kid who has the potential to operate at night or as a rescue hero get exposed to only street heroes after all.
    • Given that they are teachers at a school filled with super-powered teenagers, one of the most important considerations is the ability to control the students. Both Midnight and Eraser Head have powers that can immediately end potential conflicts between students or any other incidents painlessly. These two in particular are also skilled in restraining opponents also without direct harm (well, non-consensual harm in Midnight's case). Combined, their powers and talents make the two ideal for teaching classes and instilling discipline on young, sometimes-defiant, heroes-in-training even with their personalities.
    • Notably on the idea of controlling the students it is the teacher who can deactivate Quirks on sight who is put in charge of not only the most aggressive student (Bakugo), but also arguably the most powerful student when it comes to raw Quirk power (Todoroki). It's fairly likely that choice was deliberate. Most of the students with self-destructive Quirks, like Kaminari, Aoyama, Tokoyami, and Midoriya, are also in his class, which would make sense -– if they get out of control, like Midoriya with his early Quirk and Tokoyami in the Training Camp arc, he can manually shut them down.
    • Also note the other teachers: Present Mic can get everyone's attention in a hurry, Ectoplasm can have a clone instruct a student one-on-one, Cementoss can separate students quickly, All Might can physically stop someone fairly easily regardless of their Quirk, and Vlad King can hold back students with his blood. EVERY teacher we've seen directly teach the first year classes in the hero course has something their skillsets and Quirks can do to handle 20+ superpowered students at once without hurting them; other teachers, like Snipe and Thirteen, haven't been shown doing more than helping with specialty classes with another teacher present, and likely teach the higher classes who have already been trained to handle their Quirks and tempers a little better than the first years.
  • Tiger stands out quite a bit from the other Wild Wild Pussycats, who are quite girly. He's revealed to be transgender, implying he joined/founded the team before transitioning.
  • The second anime opening shows Todoroki stretching alone in a dark place, soon after, however, the clouds above the sun move and the place where he is becomes bright, this foreshadows the fact that the Sports Festival Arc is a turning point to a brighter time of his life, he manages to reconnect with his mother, start dealing with his trauma over his father and even befriends Midoriya.
  • Stain reducing Todoroki's ice to chunks with a battered katana and his ability to shake off a 5% Smash from Izuku's Full Cowl despite his Quirk having no apparent strength-enhancement might seem like a case of Charles Atlas Superpower, but given the nature of Quirks and how they can combine as they're passed down from parents to children, it's entirely possible that his Quirk could be a hybrid with some sort of physical enhancement from somewhere in his ancestry. This might also explain why some characters have odd appearances that seem unrelated to their Quirks — for example, Koda of Class 1-A looks like a rock monster but his Quirk is talking to animals, and Tokoyami's bird head seems to have no connection to Dark Shadow other than the aesthetic. This could mean that their Quirks are technically hybrid Quirks that present secondary/vestigial characteristics from their ancestry.
    • This could be the same reason Aizawa seems to have a minor antigravity Quirk that makes his hair levitate when he's using his Quirk. It only works when he's activated it, and since his actual Quirk is centered on his eyes, so is this one.
  • Several of the locations in MHA have their names derived from planets in Star Wars. A lot of them have meaning when you look at the events that occur there:
    • Tatooin/Tatooine Station: A train station Midoriya and Bakugo's hometown, and one of the first named locations seen in the series. Tatooine was where Luke Skywalker's Hero's Journey began.
    • Orudera Junior High School: Named for Alderaan, Princess Leia's home world. Midoriya and Bakugo go to school here before being admitted into UA High. Destruction of something precious (Midoriya's Notebook) leads to a great change in the narrative.
    • Dagobah Municipal Beach Park: Named For Dagobah, where Luke Skywalker's Training from Hell with Yoda takes place. Midoriya undergoes similar training so he can inherit One For All.
    • Nabu Junior High: Named for Naboo. Hitoshi Shinso went to this school before attending UA. In Episode I, Naboo is blockaded by the Trade Federation, referencing the obstacles Shinso was unable to overcome, not being admitted to the Hero course due to his Quirk not being suited for direct combat.
    • Hosu, Tokyo: Named for Hoth. In Star Wars, the Battle of Hoth was the result of an ambush by the Imperial army, after discovering the Rebel Alliance base there, and the Rebels lost badly. In much the same way, Stain loses due to an ambush by Iida, Midoriya, and Todoroki, and the city is almost overrun by an attack from three Nomu.
    • Kamino Ward, Yokohama: Named for Kamino, where the Clone Troops were grown. Similarly, Kamino is where All For One was growing Nomu to use in attacks carried out by the League of Villains/Villain Alliance.
    • Musutafu: Named for Mustafar, the site of Anakin Skywalker and Obi-Wan Kenobi's last battle. Bakugo and Midoriya's hometown, as well as where UA is located; possibly a reference to the bitter rivalry between Bakugo and Midoriya.
  • Todoroki and Yaoyorozu were admitted by recommendation, meaning they didn't have to take the entrance exam. Both of them have Quirks that would make it difficult for the tests to function properly if they were participating. Yaoyorozu's cannons would be potentially lethal if another student got in her way, and Todoroki would makes whole streets inaccessible with sheets of ice. Had they been present, they would have been bigger hazards to other test-takers than the robots, so they were allowed to skip the exam.
    • This is also true of at least one of those from Class B who were admitted the same way. Honenuki's softening ability could render the entire battlefield, or at least parts of it, very hard to maneuver, and could lead to drowning or suffocation if anyone was caught under any wreckage and he didn't notice.
    • Tokage, the fourth recommended student, would have been very at risk through splitting up if other students didn't notice her scales and attacked indiscriminately.
    • Yaoyorozu must have had a different exam pattern though, considering she doesn't have any kind of "high speed movement object" which could have helped her in the race.
  • During the cavalry battle, Hatsume is eager to team up with Midoriya, who's huge point value scared everyone else away. We learn later in her fight with Iida that Hatsume isn't trying to win, and only cares about drawing attention to her inventions. No wonder she jumped at the opportunity to be on his team.
  • Iida in fact was the one to defeat Stain; Stain was knocked unconscious due to a broken rib puncturing his lung. This injury could only have been dealt by Iida's kick to the chest. So even though it seemed Stain was knocked out by a Combination Attack leaving him open to a finisher from Todoroki, Iida was the one that actually brought him down. Fitting since he has the most personal tie to Stain.
  • Mineta's attempt to spy on the girls in their locker room actually kind of worked. Jiro's earphones are shown to be extremely sensitive, and she plays with them constantly. Her stabbing Mineta in the eye was actually a moment of extremely intimate contact, just not in the way he was hoping for.
  • Although the story provides a reason for why some were paired, the final exam matchups have more than just simple attempts to fix the weakness' of the students Quirks, but also help them improve in other ways.
    • Kaminari and Mina are put together at the End Of Term against Nezu. The reason why they failed was simple: The two Book Dumb characters of Class 1-A were put together to fight against a character with an Intelligence Enhancing Quirk and from the looks of the battle, it's clear they weren't even able to understand that the point of the test was outsmarting Nezu, rather than fighting him. It was obvious they wouldn't pass, because they didn't even get the assignment.
    • Kirishima and Satou both have Quirks that increase their physical strength and body but run on a timer of sorts, with Kirishima being more of a Stone Wall fighter, and Satou being a Lightning Bruiser who loses his intelligence due to the sugar he eats. Their opponent was Cementoss, whose Quirk allows him to manipulate concrete and cement. Cementoss used his power to create barriers that were easily replaceable, forcing Kirishima and Satou's frontal assault into a battle of attrition that neither could win due to their time limits. The idea behind their fight was to prod them into fighting tactically rather than going When All You Have Is a Hammer... and having Cementoss hard counter them. And while Satou has an excuse in that his power makes him think less clearly, Kirishima does not and could have at least tried to create a strategy for himself and his partner to follow.
    • Tsuyu has a Weak, but Skilled Quirk that gives her all the powers of a regular frog, just for a human to use. Tokoyami has a Unskilled, but Strong Quirk that has a lot of raw power to it, but very little control over. The entire point was to show Tokoyami that Quirk's are not always needed to fight and can be supportive, while Tsuyu is pushed to play the support role to someone whose Quirk doesn't have good synergy with her. Naturally their opponent is Ectoplasm, whose Quirk can create copies of himself that, while weak, can still close the gap and get into close combat with the Fragile Speedster and the Squishy Wizard, plus he can make larger copies that are more powerful than the others. His Quirk allows him to be both Weak, but Skilled, and Unskilled, but Strong at the same time, forcing both students to learn when offensive power is important, and also show when supportive power is needed.
    • Toru and Shoji both possess utility Quirks that are a great help with intelligence gathering and stealth, but don't give them much direct combat strength. Naturally they fight Snipe, a hero whose Quirk is the ability to manipulate the trajectory of his bullets, allowing him to both be strategic, and offensive at the same time. Since neither Toru or Shoji can hope to win in a fight against him, they both have to use their Quirk's ability to be strategic to outsmart Snipe. Notable their plan works because early on, Toru stayed close to Shoji, allowing Snipe to keep track of the two because Toru couldn't really well separated from Shoji, but because Shoji created a distraction, Toru was able to sneak around and nab him.
    • Iida and Ojiro both have Quirks that increase their physical mobility and strength, so naturally they fight Power Loader, whose tunneling Quirk negates the biggest strength both of them have. Iida is faster than Ojiro but his movement is more rigid and mostly in a straight line, which means he cannot run across the battlefield because he'd fall into a pit. Meanwhile, Ojiro isn't as fast as Iida, but he has better mobility when it comes to dodging and isn't limited by one direction. At the same time, he can't move fast enough to the exit since Power Loader is tunneling too fast for him. Naturally the strategy they use to win is to use Iida's speed advantage to move Ojiro in such a way where he gets enough of an advantage to move quicker to the exit, which works out in the end.
    • Koda and Jiro is a bit more straightforward, as both are sound based Quirk users, so they fight Present Mic. Koda's Quirk allows him to speak to animals while Jiro can use her headphone earlobes and heartbeat to create blasts of sound that are very powerful. The entire point of the test was not to see if Jiro was strong or weak, but more to see if Jiro could get Koda to break out of his shell and use his Quirk without his shyness getting in the way of the situation. Present Mic could easily negate Jiro's Quirk and any of Koda's weaker attempts at using his Quirk, so pushing him to be loud was the only way to win, and Jiro managing to do so is how they succeeded.
      • Adding onto this, Present Mic spends most of the match screaming incredibly loudly. And since most animals are afraid of loud noises, the first time he did this would have likely scared away most of the naturally diurnal animals in the forest. Forcing Koda to really step up his game and use his communication with living things outside his normal purview.
    • Uraraka and Aoyama are put against Thirteen, which seems weird at first, but their Quirks are easy for Thirteen to counter. Aoyama needs to stand still for a moment to fire his navel laser while Uraraka needs to physically touch something to manipulate its gravity. By trying to suck them up, Thirteen makes it too difficult for them to do either and pushes them to try and find ways to get around it. It's worth noting that Aizawa says in the next arc they barely passed, which makes sense as the only reason they passed was Aoyama bringing up Uraraka potentially crushing on Midoriya, causing her to let go in surprise and Thirteen to cut off her Quirk of fear for the students' safety, allowing Uraraka a completely accidental opening to get the cuffs on her. Another aspect that is not used in the story was that both have Quirks that cause them illness, so it's possible the goal was to have them somehow beat Thirteen before they overtaxed themselves.
    • Sero's Quirk allows him to make tape, while Mineta can make sticky balls. Since neither of them have Quirks outright designed for actual combat, Midnight, whose Quirk isn't suited for combat, makes logical sense. Furthermore, personality wise, Mineta is a pervert who gets Distracted by the Sexy, while Sero is the Generic Guy who has on multiple occasions called out Mineta on his perverted behavior. Naturally, Ms. Fanservice Midnight is the best opponent for the two since if the two can pass, it proves they have matured. Sero and Mineta also fight mostly by immobilizing their opponent, which won't mean much to Midnight because she doesn't have to move to activate her Quirk, and can just stay by the entrance and use her Knockout Gas against anyone who comes too close.
    • Todoroki and Yaoyorozu are matched against Aizawa because both of them have Quirks that are so powerful and versatile that both tend to depend on them above direct combat. Aizawa presents an opponent who can rob them of their greatest strengths and easily overcome them both in physical combat and mobility. To defeat or escape him, the two would have to use their Quirks in more creative manners and use each other's abilities to their fullest. In addition, because of the nature Yaoyorozu's Quirk, they just needed a moment to devise a counter to Aizawa and they would be able to win before the battle even began, as even if their Quirks were erased, Yaoyorozu's items would still be there for her to use.
    • Midoriya and Bakugo were paired against All Might to help fix their personal issues. Bakugo is Strong and Skilled with his only real flaws being his Pride uncontrollable temper. Midoriya's strong, but he also has a tendency to avoid direct confrontation and is a bit of an Extreme Doormat to Bakugo. All Might is strong enough that neither can defeat him on their own, and (as Bakugo points out) fast enough that they can't just escape without fighting him. If Bakugo continued to abuse Midoriya and refuse to work with him, and if Midoriya kept retreating and refused to stand up to Bakugo, then they would be easy prey for All Might. Their powers (which are actually fairly good all-around) were a bit of an afterthought, but considering that they're the two most well-rounded and powerful students in the class, it made sense to pair them with a very well-rounded and powerful hero, especially considering that All Might is likely the only teacher who could have stood up to a full-force attack from the two of them anyway (barring Aizawa erasing one of their Quirks, which would leave him open to the other).
  • At the end of Jiro and Koda's exam after defeating Present Mic, Koda is shown carrying Jiro through a gate. Why? Mic's screaming ruptured Jiro's eardrums, which would make her dizzy and affect her balance, so Koda carried her so they could make it through the gate before the timer sounded.
  • The perfected Quirk-destroying bullets rewind peoples' bodies to a state from before humanity ever developed Quirks, removing their Quirks permanently. This probably means that the prototype bullets rewind peoples' bodies to a state from before they, personally, developed their Quirks, so it always comes back after a while.
  • A potential reason Izuku was born Quirkless: as a recessive trait it is likely it a trait carried on chromosomes. Many traits in real life life like that are present in non-affected people, but those who are carriers. They'd be noted as Qq, with the Q being the dominant trait and q the recessive. Izuku's mom and dad likely were both carriers, and as a result Qq crossed with Qq. Thus 25% Quirk with non-carrier for Quirkless, 50% Quirk with carrier for Quirkless, and 25% Quirkless.
    • Quirklessness being so rare is also explained by this. While Quirks were originally shunned, nowadays a flashy Quirk can be attractive, so it chokes out the recessive q gene. Let's use Todoroki as an example (Bakugo would also work, as he has combination of his parents' Quirks): he's obviously a QQ carrier, carrying both of his parents' dual-dominant Quirks. If either Endeavor or Rei were Qq, either Fuyumi, Natsuo, or Toya likely also ended up Qq, but Todoroki's parents kept pushing until they had a QQ child. Now, any child Todoroki has can't have the recessive qq, since Todoroki himself doesn't carry it. Now consider how common Quirk marriages used to be, and you realize that there's been an intentional flooding of QQ people into the world, which overpowers the odds against both qq and Qq people. Quirklessness may never be eradicated, but there's certainly been a concentrated effort at reducing it.
  • A minor one, but at the start of the Final Exams arc, we see Mina and Kaminari complain about Mineta being ranked 9th in the classes' grades since they thought he was "one of them" (a.k.a. they thought he was a slacker like them as well). That being said, he is actually a bit of a slacker; despite the fact that he has the highest intelligence stat in 1-A (tied with Yaoyorozu and ahead of Midoriya, Iida, and Bakugo), Mineta's grades are lower than those of Ojiro (Ranked 8th), Jiro (7th), and Tsuyu (6th)!
  • During Midoriya's battle with Chisaki, Nighteye's Quirk predicted that Izuku was going to die by the end of it, but that didn't happen. At first this seems to be a typical Shōnen cliche about how The Hero is in charge of their destiny or some crap like that, but there's a perfectly rational explanation (as rational as the world of MHA will let it be): Eri. Her Quirk allows her to "rewind" people to a certain point, even erasing them from existence entirely! And Izuku was carrying her during the end of the fight. He likely knew that Eri's Quirk would prevent the future of him dying in that battle. It also helps that Eraser Head showed up when Eri's power was starting to overwhelm her.
    • Actually Nighteye's Quirk seems to have a pretty big blindspot, it predicts the future of its "target" but it doesn't take into account the actions of other people; for example he says "Chisaki will kill Midoriya and flee with Eri" but this is just relative to Deku and doesn't assume any action on Eri's part. It seems he "loads" the odds of his visions with his biases (subconscious or otherwise) because he just sees Eri as a victim to be rescued and not a catalyst for victory.
  • It makes sense that Nighteye was going to die. Since all his visions happen 100%, and only he saw the vision of him and Deku dying, while everyone else fought to save Eri he gave up and stuck to the future he saw.
  • A possible reason why Mic and Aizawa are shown to be friends despite their conflicting personalities: both of them are shown to be very intelligent. It's possible they were able to appreciate each other simply for being people they do not have to talk down to.
  • Why is Recovery Girl one of the people who knows All Might's secret? Well, who else could he go to for all those surgeries?
  • The reveal that Camie's Quirk makes her a Master of Illusion further serves to make her a perfect fit to be replaced by Toga, as she could have passed her shapeshifting off as illusion to Camie's classmates.
  • Why did Nomu block Izuku's smash against Tomura without being prompted, when every time prior he had to be ordered to do something? Because he was ordered by All for One before the villains came to protect Tomura from any attack made using One for All.
    • In addition to this, when All Might and Izuku talk before the Sports Festival, Izuku comes to the conclusion that the reason he didn't break his arm attacking Nomu was that it was his first time using One for All on a person, and he subconsciously put the brakes on. His original target for the punch being the much more frail looking Tomura gives another reason why the brakes were put on.
      • Also fridge brilliance in that Izuku notes that the reason his bones shatter from using One For All usually isn't the blast itself, but the shockwave that radiates through his body afterwards. That's why he can charge up OfA with no problem before releasing it, and it's why his braces and his iron soles are so useful — they also blast the kick back out for two separate attacks. If the Nomu absorbed the shockwave from OfA the way it did All Might's punches, there wouldn't have been anything left to radiate through his arm and destroy it.
      • Going further with that point, each time Deku is using Full Cowl is basically "sending the shockwave through his own body to power up". Which is actually why he feels pain when using higher percentages even while he is just standing in a place. The "focusing the power in one point" technique doesn't cause that unless you release the power upon impact since he is just reuniting energy. Using Full Cowl, however, can be harmful, since he is not only channeling power but also releasing it at the same time.
    • Tomura does order the Nomu to block it, at least in the manga. In the anime we're focused on Midoriya too much during that moment to hear what Tomura may or may not have been saying at the time.
  • With the unsettling reveal that Aoyama is stalking Deku, we know something unpleasant is in the air. It means that a character obsessed with bright and shiny things... has a hidden dark side. Sneaky Horikoshi!
  • Aoyama struggled to place 42nd in the first event of the Sports Festival and we saw him in a lot of pain after the race, coming in last among the cutoff point. In Chapter 168, he explains ever since he was little his Navel Laser has been painful to use without a support belt because he suffers power leakage problems while using his Quirk. He really was at a disadvantage.
  • Izuku fighting against Gentle with the reveal of Gentle's Quirk is actually a very worthwhile test for Izuku. Gentle's Quirk allows him to make anything elastic and bouncy... including the ground below them and even the air in front of him. This means most brute force or offensive tactics will not work on him and push Izuku to do better, especially now that with the focus on long-range combat.
  • The collaboration between My Hero Academia and the Marvel Cinematic Universe to promote Avengers: Infinity War focuses on trailers which show that All Might and Class 1-A idolize (or in Bakugo's case, begrudgingly respect) the Marvel heroes, especially given certain parallels between some of the comparisons (Deku notes that Captain America was once powerless like him, but never gave up to fight for his heroic ideals, for example). This works on multiple levels:
    • The United States is credited in-universe as the birthplace of superheroes — obviously a Shout-Out to said country being the homes of Marvel and DC, the two companies which formed the foundation of superhero fiction, which My Hero Academia takes heavy inspiration from. Not to mention, many of their heroes obviously being American as well, barring exceptions like Black Panther, Thor, and Star-Lord's alien teammates from the Guardians of the Galaxy. All Might in particular is a very "golden age"-esque classic style American superhero: a blonde haired, blue eyed, musclebound stud with a chiseled smile blowing away every enemy in his path.
    • The Class 1-A students are teenagers who grew up in a universe which reveres the hero profession, and are heroes in-training themselves who look to older pros for inspiration. Many of the Marvel heroes are adults or at the very least, in the case of heroes their age like Spider-Man, experienced crime-fighters themselves and have gone through a lot more than their U.A. counterpartsnote . There's also the massive difference in how long both franchises have been around: My Hero Academia began publishing in 2014, nearly 6 years after the MCU began with Iron Man and more than several decades after many of their heroes made their debuts in the comics proper.
    • One main source of conflict in My Hero Academia is whether a hero must choose whether To Be Lawful or Good; people like Izuku and Shouto recognize that doing the right thing at times means breaking their universe's pre-established rule that Quirk users must be licensed to use their powers in public, and vigilantes are frowned upon despite their intentions. Such a struggle formed the basis of Captain America: Civil War, which delivered good arguments for both sides of the conflict, and outlaw heroes in the Marvel universe tend to be treated a lot better than their Academia counterparts. Even the Avengers could be considered as a Hero Agency in the Academia universe, with Spider-Man outright calling his crime-fighting activities an internship akin to the ones done by U.A. students.
    • In something which overlaps with Fridge Horror, Shigaraki takes the place of Thanos in the MHA version of the poster. His Decay Quirk allows him to disintegrate everything with the touch of his fingers, much like how in the end of Infinity War, Thanos ends up disintegrating half of the universe with a snap of his fingers after completing the Infinity Gauntlet.
  • Towards the end of the anime's third OP, Sora ni Uteba, we see scenes of Class 1-A taking their exams. Several of these scenes serve as Foreshadowing to the circumstances of the exams.
    • Tokoyami and Asui are both in positions that suggest they've just landed from a great height (and we even see Tsuyu land on-screen). The majority of their exam involves them trying to escape from Ectoplasm by using their Quirks for their mobility.
    • Satou and Kirishima both have Quirks based on brute strength, but neither are fighting at full capacity — Satou's Quirk makes him dumber the more sugar he eats, and only Kirishima's arms are hardened, when he can cover his whole body. They're not using all of their resources in the face of a stronger opponent, so it's not going to end well.
    • Uraraka's face takes up several frames when she and Aoyama show up, indicating that the exam will focus mainly on her realizing she has feelings for Deku, while Aoyama takes a backseat.
    • Shoji is shown with several of his Dupli-Arms turned into ears and eyes, indicating that he and Hagakure have no idea where Snipe is, and their exam is going to focus on avoiding, locating, and subduing him.
    • Kaminari and Ashido are the only duo to have a high-angle shot of themselves, implying that Nezu is looking down on them; indeed he is, both literally and metaphorically. Not only is Nezu in a crane destroying the city they're in, but they're the two lowest-scoring students in the class, and Nezu's Quirk is literally Amplified Animal Aptitude. They're also looking away from one another, whereas all other groups have them moving and/or looking in the same direction or at each other, implying they're clueless as to how to beat Nezu.
    • Yaoyorozu is alone, but looking resolute, preparing to use her Quirk; by this point in the exam, Todoroki had been captured and suspended over a bed of caltrops by Aizawa, and Yaoyorozu is finally getting over her self-confidence issues.
    • Sero's tape is seen blatantly across Mineta's face in their exam shot, before it retracts into his arm; Sero is incapacitated for most of the fight, but Mineta places his tape over his nose and mouth to avoid getting KO'd by Midnight. Also, Mineta takes a pose that implies he's going to grab onto something, and considering what Midnight's main identifying trait is, and Mineta's personality, you know what he's thinking about.
    • Iida and Ojiro's exam shows only the latter, flying above several holes in the dirt. To clear their exam, Iida uses his engines to "throw" Ojiro into the gate while getting buried himself, explaining why he's off-screen.
    • Jiro and Koda are the easiest to spot — the wind blowing through the grass represents the volume of Present Mic's Quirk. However, Jiro also has one ear covered, possibly to stop the bleeding that results from Mic's Quirk damaging her eardrum. Koda's bringing his hands towards his mouth either as a show of nervousness, or as he's preparing to speak to the bugs and beat the exam.
    • Bakugo, sans Izuku, flies through the air with his explosion Quirk, his red-hot hand coming into contact with the camera. This represents a point where he breaks away from Izuku to attack All-Might on his own.
      • The lack of Izuku, Todoroki, and Iida in their respective exam shots also serves to create suspense as to whether or not they make it out of the fight with Stain.
  • While he'd never admit it aloud, some part of Todoroki instinctively knew that he should stick to ice on Bakugo. After all, when your opponent's Quirk is sweating nitroglycerin, do you want to surround him with ice to lower the temperature or do you surround him with fire that logically should give him a power boost? Or, inversely, blow up Bakugo to bits with his own sweat set on fire, which Todoroki really don't want it to happen.
  • Yaoyorozu (whose Quirk allows her to create any inanimate object that she knows the molecular composition of) mentions that it's against the rules for people to use their Quirks to manufacture products, especially money, as it would disrupt the economy. Being a Spoiled Sweet Ojou, it stands to reason that her family likely capitalized on the Creation Quirk in previous generations, before laws could be implemented to regulate such things!
  • While Yaoyorozu's costume may seem to be mostly for fanservice, the design and what it shows actually make sense given her Quirk. Her Quirk allows her to make inanimate objects from her body fat. Her costume is a leotard which exposes her arms, legs, and part of her stomach. These areas of the body tend to have some of the largest fat deposits.
    • It is also stated that she was intending to make the costume even more revealing than it was but wasn't allowed to due to the rules on modesty (no doubt thanks to women like Midnight). This implies that she was originally planning to employ her rather large breasts in combat due to their high fat content as it is hard to see where else on that costume she could gain an advantage by losing any more fabric. Its also possible of course that she may have been discouraged to do so by the fact that she would have gone down to an a-cup each time which sounds rather painful.
  • Class 1-B's School Festival idea is a play that manages to be a strange mash-up of The Lord of the Rings, Star Wars, Romeo and Juliet, and Harry Potter. The idea is suggested to have come from Monoma, which makes sense when you realize that the guy whose Quirk is all about copying other people's Quirks can't come up with anything original.
  • Endeavor's reverence for All Might's position seemed strange. It should be merely a slight increase in standing, but he treats it as an impossible gap to cross. When he gets it, it brings nothing but misery to him. Partially because he didn't technically earn it, but mostly because he knows he can't fill the position like All Might did. Why the obsession over a simple number? Because it's not just a number. The ranking system we see in the series is supposedly only used in Japan and not recognized by other nations, but All Might is repeatedly referred to as "the World's Symbol of Peace and Justice". All Might wasn't just Number 1 in Japan, he was an international phenomenon. He was so amazing that he transcended the rankings entirely. He became a global beacon of heroism, not just Japan's top rank. To Endeavor, being bumped up a number is worse than meaningless, because despite the title, he's still just as far from All Might as ever -– but now with the pressure of trying to live up to a role that no simple number could approximate. A role that he understood better than anyone that he could never really fill. No wonder he got so upset about it.
    • To put this into perspective, My Hero Academia: Two Heroes expands on this: whereas the rest of the world have a 20% national crime rate on average, All Might's presence alone has suppressed Japan's crime rate down to the single digits. There's also the implication that the US, the birthplace of heroes itself and where All Might trained after graduating from U.A., is not faring that well either, which is why All Might's retirement was a shock to the U.S. hero association as well.
  • Todoroki's Quirk splits his fire and ice down separate halves of his body, with the left side being his fire half. A Sinister Clue is a trope related to the fact that many people see left-handedness as a sign of being evil or demonic and tied to hell. The left side, the fire half, originates from Endeavor, whose Quirk is Hell Flame.
  • A reason that Tsuyu tends to come off as Mineta's minder/friend more than viewing him as a pest sometimes: Tsuyu is the primary caretaker of her younger brother (and sister), and Mineta is fairly small. It's possible, to some subconscious degree, that she mentally compares him to one of her brother's friends and treats him more like a disobedient Dirty Kid and seeks to parent him away from such behavior like she would a ten-year-old friend of her brother.
  • One might wonder why no one ever went around warning people publicly about All for One, for even if the idea of him shadow ruling Japan was a shameful past, the possibility of him still being alive is a serious danger to people. However, Izuku commented that the 'shadow ruler of Japan' was an internet story. Trying to warn people about him would basically be telling someone the Illuminati was after him, and very few if anyone takes such a warning as anything but delusional paranoia.
  • No one brought up the issues of Mina naming herself after Ridley, Alien, and the Xenomorph when it came to copyright, only that the name itself was weird. Failing to know legality wasn't probably in play though, as the series later suggested a lot of big franchises from the 20th century such as Star Wars and Harry Potter entered the Public Domain by the present day, meaning that they do not fall under copyright concerns. note 
    • As to why public domain wouldn't have been fought tooth and nail (see Mickey Mouse laws), there are several likely reasons. One is that the emergence of Quirks means that stories with superpowers aren't as lucrative, which has flaws. The other argument is that Quirk management legislation was pressing enough lobbying to make extending the protections seem stupid (likely combined with a backlash against superpowered fictions when Quirks were still controversial, making them less profitable to make movies and video games of to extend copyright). Nowadays, it could also be that movies about superheroes or fighting monsters are viewed the same way as racist movies are in our world –- discriminatory products of the time that no longer reflect views it's okay to hold, especially since mutant Quirks were some of the most discriminated against. Finally, it could be that it's just been long enough that even after extensions, the copyrights still expired, though less likely now that Disney is in charge of Star Wars and it's implied Disney's copyrights, like Universal Studios and Disney Land, are doing just fine.
      • It's possible hero names aren't necessarily subject to as many copyright laws. Think Dove chocolate and Dove soap: very similar, but it's allowed because they're entirely different markets. Unless the movie studies are trying to send out branded superheroes of their own, it's entirely possible that a hero name referencing a movie or movie character just isn't worth the cease and desist, especially since it's extremely clear that it applies to Mina and not to anything within the movie, and shutting down a successful hero would just be bad publicity. If she was going around actively dressing up and acting like a movie character, it'd probably be worth it, but as it stands it's a totally separate industry. Laws also could have made exceptions for hero names, since the original licensed heroes likely would have been dying to reference old superheroes of yore when picking their names.
    • Speaking of names, given Midnight's reactions to the names the students choose, it seems as if she is approving them based on her personal preferences. However, looking at how she gushed about "youth" multiple times during the Sports Festival, it makes much more sense. Namely, she's a fangirl, and as such her reactions to hero names are a good way to judge the reactions of the public as a whole.
      • Midnight is an expert on the court of public opinion. Public perception of her being a slut, for example, went so far as to change costume laws for superheroes against her, a move that she still protests and hasn't been able to undo. If there's anyone who knows the likely effect of a hero's name and appearance on their public perception, it's her.
  • A minor one from the School Festival arc, but one part of the Uraraka versus Bakugo fight that ties into Aizawa calling out the pro hero who was calling out Bakugo, is that not only was the pro hero saying Bakugo was basically using Uraraka as a punching bag, he was also inadvertently calling Uraraka weak. By calling out Bakugo for not finishing her already, the pro hero was insulting Uraraka by implying that there was no way she could beat him. In addition, not only was Bakugo taking the fight seriously, but the pro hero was not aware of Uraraka's plan she had made for her final attack, making it clear he had no faith in her. As seen shortly after Aizawa called him out, Uraraka's last-ditch attack could of worked on Bakugo, as he himself notes he nearly failed to stop it. Not only would Aizawa be pissed about the pro hero calling out Bakugo, he'd be pissed that someone was calling one of his students weak as well.
  • Why is Hawks helping Endeavor becoming a good Number One Hero after All Might's retirement? It's because he's a good wingman.
  • Vol. 0 gives an explanation for why All Might, a Japanese-born superhero, would name all his attacks after places in the United States: Gran Torino told him to go across seas after Nana Shimura's death, to avoid All for One's influence. The America-themed attacks exist because the United States is where All Might officially began his career as a Hero.
  • Another small one from the Sports Festival; During his match against Shiozaki, we briefly see Kaminari's hair float up around his head while he's charging up a big attack. It's not just a cool visual –- his hair is standing up due to static electricity.
  • Jiro, who had low Quirk appreciation test scores, did a lot of physical training during her internship with Death Arms. A random choice perhaps, but think about how Izuku, Bakugo, and Ochaco's internships went, and how Fourth Kind wanted to teach Kirishima and Testsutetsu manners and how to hero outside of fighting and saving, one could take the interpretation that the internship she got was partially to work on a flaw of hers, namely her physical ability (she placed poorly on the Quirk test, which had a lot of physical fitness elements).
  • The round that each winner took in the sports festival was due to their strengths, and the other two's weaknesses.
    • The 4 kilometer race was won by Izuku Midoriya based on his forward planning and improvisation ability, which allowed him to surpass Shoto and Katsuki (who were only thinking on going forward and winning, and not much else.)
    • The cavalry battle was won by Shoto Todoroki, who had the most thought out plan and teammate choice. Katsuki had ideas, but he had to be reminded of what his classmates could do, and Izuku wasn't able to really make the choices he wanted because of how high-risk his actions were (sound familiar?).
    • Katsuki Bakugo won the battle tournament because he was solely focused on winning: Izuku was focusing on helping Shoto in their fight, while Shoto did not have his head in the game due to both Izuku's talk and his stress about his father (if he didn't taken the result of such combined power into account).
  • Kirishima being able to bond with Bakugo makes sense beyond the former being just an all-around Nice Guy; Kirishima is also obsessed with things that are manly and is also not particularly smart at that. He likely sees the latter's No-Nonsense Jerkass behavior as manly. He also has thick skin, so he doesn't get bothered by Bakugo's attitude easily.
    • A video of the Chivalrous Hero, Crimson Riot, showed that he also had a rather gruff nature, even being prone to swearing. Kirishima's looked up to Crimson Riot ever since he was little, so of course he wouldn't mind having a friend with similar traits.
  • It's noted on the YMMV Page that several characters, among them Tsuyu, invite Uncanny Valley reactions from some readers. These same feeling were likely in play during the emergence of Quirks when people were debating what was human. Those members of the audience are reacting just like in-story characters did back when All for One was young.
  • One of the reasons Uraraka wants to be a hero is because she wants to earn enough money so her parents can have a comfortable life. As Iida said, there's nothing wrong with this, but why would she choose to be a hero when she could've picked some other high-paying job like being a lawyer or doctor? Well, turns out she has similar or the exact same reasons as Midoriya. Guess they're more similar than they thought.
    • It's possible she was planning on going for that, had she not gotten into U.A. But since her Quirk was good enough to get her in, she just didn't need to take the harder options. Besides that, it seems like the medical industry is one of the few where you can get a license to use your Quirk if it's significantly helpful; Uraraka would have been competing against people who had better Quirks, more money, and better grades.
  • One For All being revealed as passing on the Quirks of its previous users makes sense when you remember the power of the original Quirk that later became One For All. It was a Quirk with the power to pass itself on to another. It either already had the power to pass on Quirks other than itself (much like All For One) or by transforming into One For All, it gained the power to imprint the user's Quirk onto itself, strengthening One For All.
    • One For All is explicitly described as a power-stockpiling Quirk. Quirks are superpowers.
    • It also has shades of Semantic Superpower: One For All is the combination of a power-stockpiling Quirk, and a Quirk that lets the bearer pass their Quirk to another person. Nana Shimura's Quirk was Float, for example, until OFA joined it in being her Quirk. And thus both of them are "her Quirk" to pass down.
  • After the first user until All Might, every user of One For All had a Quirk of their own before being given One For All. They were born with Quirks, born special, and yet none of them could defeat All For One. It was only when Nana passed on the Quirk to somebody who wasn't born to be a hero, the Quirkless All Might, did the world's greatest hero, one who could defeat All For One, appear.
  • Monoma's Phantom Thief code name makes sense when you consider his goal as an anti-hero: he's there to steal the spotlight from the more extravagant heroes. He also needs to be sneaky to make best use of his Quirk, as he has to touch someone to copy them and his powers work best when his opponent is unaware of what Quirks he currently has available.
  • There's a good reason Iida didn't vote for himself as class representative, even as he wanted the job himself: as he said, the election was about people getting their classmates' trust, and voting for himself could have been considered "cheating" on his part.
    • In the same vein, him eventually taking over as class representative with Momo being ignored in spite of being the deputy makes just as much sense: he earned the class' trust by showing he could do the job, while Momo didn't do anything in the same occasion.
  • Why was Black Whip the very first secret power Deku activated beyond One For All's habitual physical enhancement powers? Midoriya has been trying to cling and reach his dream to be a hero for years, even when he couldn't realistically achieve it. So Meta-wise, it makes senses why Black Whip was the first Quirk unlocked –- Izuku is prone to try to reach and grab his goals impulsively. And the most fitting Quirk for that? The one that allows him to reach, grab and seize stuff far away from him with just a thought.
    • It's also somewhat similar to his mom's Quirk, which allows her to move small objects and pull them to herself. So the idea of 'pulling things to oneself' is somewhat familiar to him.
    • Alternately, it could be that the Black Whip Hero was the second wielder, though only time will tell if Izuku unlocks the Quirks in chronological order.
      • The Black Whip Hero, Lariat, was actually the fifth wielder.
    • The second Quirk he manages to activate is Float, which was Nana Shimura's (All Might's mentor). Now that he is achieving his goals by grabbing them, he wants to keep moving forward — and what's best for that than finding a way to be able to fly? This is also a sign of the influence two other women have had in his life: his mother, who, when he was little, liked to make objects float to entertain him, and his first real friend, Uraraka, who can use Zero Gravity to make herself float as well.
    • The third Quirk Midoriya unlocks is the Fourth's Danger Sense, an ability that causes a numbing pain when imminent life-threatening danger is coming. Fighting an opponent like Shigaraki, where just one touch can lead to death, makes having an ability like Danger Sense a must-have.
  • The main lesson Tsuyu learns in her A Day in the Limelight episode in the Field Training Arc is the importance of following orders and being a team player. This explains why she emphasizes the spirit of Aizawa's allowing the students to use their Quirks against the villains in the School Trip arc (to protect themselves, not take the fight to the enemy), and why she takes the harshest stance against the unauthorized rescue mission.
  • The third season's second opening begins with a scene of Class 1-A frozen in mid-air, with the exception of Bakugo and Todoroki, who are standing with their backs turned to the camera. At a first glance, it seems that the class is in pain or being attacked, and Aizawa looking away — as if he was just erasing their Quirks — gives that impression. But on closer look, the students aren't in distress, they're happy, jumping for joy, because they passed the exam. The last scene of the opening does something similar — the students are all looking at the camera, while Bakugo and Todoroki — the only ones who failed the exam — are looking away.
  • Toga's "love" for Stain takes on an interesting light after her backstory is revealed: both their Quirks involve drinking people's blood, something Toga's own family reviled her for, but something her Quirk compelled her to do. It's entirely possible, even extremely likely, that Stain had the same compulsions and issues she did growing up, and yet, in a twisted kind of way, he was accepted by a lot of people who embraced his ideology, like Spinner and Dabi. Did Toga, even subconsciously, hope to find some acceptance for "her normal" among Stain's followers?
  • A Central Theme in the series is "Legacy." Midoriya receives the legacy of All Might and One For All, trying to become the next great hero; Shigaraki received the Legacy of All For One, to become the next great villain. In later arcs, this even reflects in how they grow stronger: Midoriya is gifted with the Quirks of great heroes who came before him, willingly. Shigaraki, on the other hand, is building his power base by effective high-jacking the legacies of villains who came before him, like Stain's philosophy, Overhaul's bullets, and Destro's followers, and twisting them to his own ends. One For All passes strength on-All For One steals it.
  • Weirdly, Midoriya is more similar to Endeavor then he is to All Might. Both of them have powerful Quirks that can seriously harm them if overused (One For All; Hellfire). Both have good analytical skills and good forethought. Endeavor is also one of the few who can understand Midoriya's Techno Babble mumble-thons without any confusion whatsoever. Arguably, and somewhat ironically, Endeavor teaching Midoriya could help him improve far better than training with All Might.
  • Ryukyu is portrayed as a very calm, collected, and patient woman, a stark contrast with her intern Nejire. In fact, it makes perfect sense for her to be Nejire's mentor. Strong as she is, Nejire can also be exhausting to deal with because of her near-childish personality and short attention span (which may be even seen as a sign of ADHD); also, in a formal society like Japan, her touch-feely manners may be problematic for a lot of people. It takes someone not easily losing their patience to tutor her, and UA faculty may have specifically directed Nejire to Ryukyu because they knew the Pro Heroine was best suited for their promising but high-maintenance student. Ryukyu may also have picked her for this exact reason –- her curiosity and constant examinations of the people around her may easily pick things up that Ryukyu is too reserved to catch, at the same time that Ryukyu's cool demeanor balances Nejire out.
  • When Magne sends Compress flying at Bakugo during his escape at Kamino, she does it by magnetizing both him and Spinner to have the latter repel the former. This trick only works if the "anchor"(Spinner) remains stationary for the "projectile"(Compress) to push off of — something that would be difficult given the apparent amount of force involved. Which is why Spinner is the "Anchor" — his Quirk lets him stick himself to the ground so he won't move.
  • Early on after the U.S.J incident, both Shigaraki and Kurogiri were determined to be using aliases, a minor detail that quite notably exploded in importance as we later learn more about their origins. Very long foreshadowed on the author's part.
  • Many of the heroes in the top 10 who have had Quirks revealed don't have Quirks that are traditionally easy to use or broken, such as Best Jeanist, Edgeshot, and Hawks. Someone like All Might or Endeavor is an exception to the rule it seems. There are a couple of ways to look at this, and one of them could be the idea that someone like Best Jeanist has to work a lot harder than someone who had a far easier Quirk and that hard work translated to results. There are, however, fridge horror ways of doing so. See below.
  • It's discussed between the fandom that Toga' ability to use her transformations' Quirks is not compatible with the mechanics of the verse. However, it makes sense why this ability has never been explored before:
    • For starters, a good deal of the population don't have flashy/practical Quirks to use in first place. It's likely Toga' victims didn't have Quirks to help them against her... or she killed them before they could use them.
    • It also seems Toga lacks intuitive knowledge about her transformations' Quirks, which averts the Instant Expert trope. She needs to see how they use their Quirks before to know how to activate and deactivate some of them.
      • Which makes her appearance in the Provisional License Exam more impactful: she saw how Uraraka used Zero Gravity during the test. While that wasn't her intention, Toga certainly found it useful during her fight with Curious.
    • To make things more difficult, she needs to ingest her victims' blood to Transform into them; once she runs out of blood, she can't Transform into them nor use their Quirks. And acquiring blood for a specific Quirk is hard to her. She can't run the risk of wasting valuable blood due to trying to figure out her transformation' Quirk.
    • Toga spent most of her life being forced by her parents to suppress her Quirk and only started going off the deep end after middle school, which in Japan spans from age twelve to fifteen. Toga is only seventeen years old, so she's had a lot less time to really experiment with her Quirk beyond simple transformations.
    • In the movie, Two Heroes, a concept called Quirk Numbers appear to be the chromosome version of superpowers (we can assume that it's where all the different data for Quirks are stored), which are also presumably in the blood!
  • Endeavor's choice to more or less cut himself away from his family and move them has a second purpose: to keep them safe. With the war between the villains and the heroes rising, he likely wants to have them stationed somewhere as far as possible. Hell, it's likely he has come to the possibility of dying and thus has given them the seeds to have life without him.
  • Dabi getting infuriated at Hawks' for killing Twice and his offer of redemption to Twice, in which Dabi overheard everything Hawks said to Twice, has more to do with his past and ultimate goals than actually caring for Twice as a person. After Dabi reveals his true identity to the public as Toya Todoroki, it makes sense why he was especially angry at Hawks. Hawk's talking down to Twice reminded him too much of his own life and the fact that he called Twice "unlucky" despite it being the very same Hero system that failed them in the first place made Dabi go understandably berserk. It doesn't help that he knows Hawks admires Endeavor, Dabi's father whom he hates and wants to demolish his heroic legacy.
  • The first opening theme for Season 4 is called "Polaris," another name for the North Star. Because Polaris lies nearly in a direct line with the Earth's rotational axis above the North Pole, it stands almost motionless in the sky, and all the stars of the northern sky appear to rotate around it, making the North Star a fixed point for navigation to guide people home. The song is about Midoriya's and Mirio's declaration to protect Eri. They are the constant, unwavering stars that will guide her to a safe place and a real home.
  • Uraraka's hero costume being a skin-tight body suit actually makes a lot of sense when one thinks about the nature of her Quirk and how it works. Any loose material, such as flaps and whatnot, would be affected by her zero-gravity abilities and potentially get in her way anytime she would need to make herself float.
  • Both All Might and Nighteye chose someone like the other as their protege. All Might choose the intelligent, detail-oriented Awesome by Analysis Midoriya, and Nighteye choose the pure-hearted, ever-smiling, invincible brawler, Mirio.
  • Why didn't All For One try to steal One For All? Probably because he can't. "All For One" allows the user to take someone's Quirk, and give it to someone else. "One For All" allows the user to give the Quirk to another person, but doesn't allow the user to take someone else's Quirk; as a tradeoff, "One For All" is a Quirk that can be given by the user, but cannot be taken from the user.
  • Overhaul refers to his top agents as the "Eight Bullets of the Hassaikai." Bullets are inherently something to be used once and discarded, demonstrating quite clearly how he views them.
  • For the most part the story manages to avoid the Bad Parents trope that is common among super-hero stories. Bakugo's parents are well-meaning and acknowledge their failings with him and are willing to give him to UA in hopes of making him better. When Jiro explains to her parents that she wants to be a hero and not a musician she's in tears, thinking that she failed them in some way. Only to have them tell her to do what she wants, because they are always going to love her and be proud of her. Midoriya's mother is willing to pull him out of UA because she sees how it's hurting him and is willing to be hated for it so long as it keeps him safe. Even All for One is shown to be supportive of his protege Shigaraki, going so far as to support him and the League of Villains in Hosu.
    • While Endeavor has shown he can be a Bastard, even he is taking steps to improve his relationship with his children; He's the exception, not the rule.
    • The reason there's relatively few parental issues among the heroes, and heroes in training, is because being a hero is a recognized, highly respected career. In most series, the Kid Hero struggles to keep a Secret Identity and continue his/her hero activities while keeping up with the civilian and family duties, which causes lots of parental friction; this doesn't happen in a series where the family can support the kid's heroic career just like they'd do with a military or police one. Also, being a recognized and remunerated career means that people with enough power and dedication consider becoming heroes from childhood, and in an orderly, reasonable manner, instead of being motivated by tragedy as it happens to many heroes in other series. As stated above, those who become heroes as a form of atonement, revenge, or motivated by negative feelings in general are the exception rather than the rule.
  • When Bakugou agreed to help Kirishima study for the end of term exams, he was as explosive as usual. But this time, it's not Bakugou just being an asshole. His mom is a firm believer in tough love, she puts pressure on him to be strong by being harsh, and it was shown at the license course that he is willing himself to apply her methods to the young children. He was tough on Kirishima because he cares about the latter and wants to motivate him to study hard and have success.
  • Given how several studies have proven that increased and regular sugar consumption makes brain activity deteriorate over time, Sato doping out and becoming sleepy after using his Quirk makes a whole lot of sense.
  • America being the "Home of Heroes" might not just be an allusion to it being the largest influence of super hero comics. It's mentioned multiple times that the early days of Quirks were incredibly chaotic, and it was only through strict regulation that peace was achieved. Any one familiar with Japanese history might think this sounds familiar: it's similar to the Warring States period of Japan! It was only after Toyotomi Hideroshi and Oda Nobunaga had basically made owning weapons illegal for all but a few elite members of society, and all of them members of the Shogun's administration, that peace was restored. Contrast this with America; where Japan fell into 150 years of civil war because of personally owned weapons, America used personally owned weapons to establish their country. And if you look at Quirks as natural, personal weapons, you can see how different cultures might see them. The US is the "Home of Heroes" for the same reason that it does really well in shooting sports; more permissive attitudes means that people have more opportunities to practice, and it's probably easier to get a license than in Japan.
  • Aoyama choosing an English superhero name makes sense if you remember that he likes getting attention. English is the most spoken language worldwide, so a lot more people would understand the meaning of his name. Also, while it is true in real life that most French people stick to their culture and don't speak much English, Aoyama lives in Japan, so he is already used to another culture and while he himself is very attached to the French culture, he never showed signs he hates other cultures. His classmates were surprised that he chose an English name despite saying a lot of French words and that was very likely intentional in order to draw attention. He probably also wants to show that he doesn't look down on other cultures.
    • Also, considering his name and the fact that he lives in Japan, it's also possible that his heritage isn't French, if at all, but he just prefers sticking to French culture (at least a big part of it).
  • Aoyama's Quirk isn't compatible with his body, but this actually seems to be the principle behind his character design; his costume looks like a suit of typical High Fantasy armor suggesting a melee fighter, but functionally he's a Squishy Wizard (seriously he gets one-shotted every time he's in a fight).
  • All Might's bunny ears like hairstyle might be Rule of Funny In-Universe. It has been established that he wants to make people happy and one of his ways of doing so is through comedy, so he probably chose that hairstyle for that purpose.
    • This might also apply to other heroes who have something funny in their designs or names, take for instance the washing machine hero.
    • Alternately, they're meant to invoke the victory sign.
  • Deku's shoes go well with his bunny-like hero costume considering rabbits have big feet. Also, he has fluffy hair similar to fur.
  • Bakugou's first try for a hero name was "King Explosion Murder". This might be a coincidence, but his hairstyle does slightly resemble a crown.
  • Gran Torino is one of the few heroes who has gone up against All for One on several occasions without getting his Quirk yanked. His power isn't something that would mutate the user nor is it overly skill-based like Fiber Master. Why does Gran Torino still have his powers? Simple: he is a master of evasion and is hard for All for One to get a solid grab on him to remove Jet. The Warping Quirk is heavily implied to have not been present in the battle that cost All Might his guts and All for One his face, meaning the one power that let All for One catch him wasn't present. In an interesting coincidence, the other ally that we know All Might had in his battles against All for One, Sir Nighteye, could see into the future and was fast and quick enough to avoid blows by faster and stronger opponents, and he in turn trained a young man who could render himself intangible to physical blows.
  • Rock Lock's distrust of the hype that U.A generates for its students, along with his debut in an arc sandwiched between stories debuting other hero schools, leads one with a pretty viable argument that Rock Lock did not attend U.A. It's possible his size-limited Quirk wouldn't even be effective on robots, expanding on the post Shinso battle of the Sports Festival.
  • Deku's special move Delaware Smash has him flicking one finger at a time in order to create powerful shockwaves. Have you noticed that it's usually his middle finger he's using?
  • All Might's secret identity is an inversion of Clark Kenting, or at least the opposite of what Clark Kent himself does. Clark Kent changes his name but his appearance would be recognizable in real life. All Might on the other hand uses his real name "Toshinori Yagi", which is known to the public, but real-life people wouldn't recognize him by his appearance alone if they didn't know prior it's him.
  • The second opening theme for Season 4, showing Class 1-A happily preparing for the festival, seems like a big case of Mood Whiplash since we first see it right after the episode where Sir Nighteye dies a tragic death. But Nighteye's last words to his comrades were for them to cheer up and smile, because a society without joy and laughter has no bright future.
  • Why do many people start believing Dabi's recording about Endeavor and his criticism of heroes in general, despite his false claim of Best Jeanist being alive? Simple. Best Jeanist was missing from the public masses for months and didn't return to help until Gigantomachia was at Shigaraki's location. Even if what Dabi said wasn't true the public feels that the real liar was Best Jeanist as he didn't announce to the public about his recovery and his disappearance meant he lied to the public, not just Dabi. The fact that best Jeanist lied about his disappearance, and having the highest approval rating of the masses, only reinforced Dabi's claim that heroes are just criminals who lie while holding masks of justice.
    • There's also the fact that people will wonder why he was so convinced. Even if most don't believe it, there will be some who will conclude that Dabi was presented with a corpse that was passed off as him. Which will lead to those people wondering how that was done with some thinking it was fake and others thinking someone was killed for the charade. All it takes is one person posting such a theory on the internet on the right site and the rumor will become wide-spread even if most dismiss it.
  • One For All being dangerous for those who already have a Quirk makes more sense when one remembers that it was originally a Quirk designed to empower the weak and oppressed (the First Wielder) to fight against the strong and tyrannical (All For One). Those who already have power (those born with a Quirk) cannot safely keep One For All without its power burning through their life force. Only those with a strong sense of justice but too weak to fight against evil, like the First Wielder used to be, can safely use One For All to its full potential.
  • One For All being deadly for Quirk Users gives it another layer for it to contrast with its sibling Quirk All For One. All For One hoards all the powerful Quirks it can and while One For All can also hoard Quirks, it is deadly for Quirk Users to hold onto and can only be safely used by the Quirkless. The Quirkless cannot pass on any Quirk Factor and so, One For All can't possibly hold as many Quirks as All For One can.
  • On the subject of those two Quirks in particular, it's interesting to note that All For One is an evil counterpart to One For All. Both are able to stockpile other Quirks inside themselves, but in opposing ways. All For One steals the Quirks of others, ripping them away without consent. One For All is a Quirk that can be passed on to others, a gift willingly given. All For One stockpiles many Quirks during a single user's lifetime, while One For All can only acquire a single new Quirk per user. All For One makes stolen Quirks stronger by stocking multiple copies, while One For All contains a single copy of each Quirk and grows stronger each time it's passed on. All For One leaves its victims Quirkless, while One For All was created to give a (seemingly) Quirkless individual a Quirk. All For One ignores the feelings of its victims, while One For All bears its prior hosts within it, forever preserving their feelings. All For One doesn't come with a Quirk instruction book and won't make you as good at using a stolen Quirk as the Quirk's original owner, while One For All lets every gifted Quirk's original owner come with it and teach you how to use their Quirk themselves. All For One lends itself to highly strategic usage with a massive toolkit, while One For All defaults to but a single hammer unless you awaken the bequeathed Quirks sleeping inside. All For One lets its user steal Quirks to extend his life, while One For All causes Rapid Aging by burning through its user's life force if they already have a Quirk. Both Quirks have the same end result of giving the user multiple peoples' Quirks in a single package, but take exactly opposite paths to get there. ...And, y'know, All For One's owner created One For All, albeit not entirely intentionally.
  • Midoriya's battle against Overhaul makes a lot more sense after the Paranormal Liberation Arc. Notice how Midoriya was zipping through the air with One For All: Full Cowl 100%? Think about what "100%" means for a moment. Full. Complete. Perfect. Everything. All. True 100% includes all of the bequeathed Quirks, not just the base power stockpile, and what did we see in that battle? Deku floating in the air with the shockwaves of his movement, and (in the anime) whipping Overhaul apart with his lightning aura before the final punch. One For All: Full Cowling 100%. That may have been the moment when Izuku began to unlock its full potential, and he might very well have been subconsciously using the basic power-stockpiling as a precursor to Float and Blackwhip.

  • It might seem like an Ass Pull to some for Deku to manifest the quirks of his predecessors when All Might, the most successful user, never could; but it does make sense from a meta-perspective. All Might is a clear Expy of Golden Age Superman whose "powers" were mostly just applications of his super-strength, hence as his successor Deku is an expy of Silver Age Superman. And what is the most standout feature of silver age superman stories? ...New Powers as the Plot Demands!
  • Why was All Might immediately able to One For All at maximum strength, while Deku still can't do the same without breaking his bones? Well, it's stated that All Might held onto the quirk longer than any of his predecessors. It stands to reason that, powerful as it may have been, the quirk's power maxed out at a level that All Might's body was simply capable of enduring when he got it. The same isn't true for Deku because the work All Might put in over his forty or so years in service had the knock-on effect of giving the quirk a significant boost in power, which leads to broken bones in a young vessel whose strength didn't grow in tandem with the quirk like All Might's did.
  • Deku Manifesting his own version of All Might’s Glowing Eyes of Doom in his new hero look might not just be artistic merit, or a sign that he’s adopting a similar self-destructive mindset of his mentor used to possess whilst upholding the image of the symbol of Peace in his new role as a Vigilante protector in this time of Crisis. One thing that always differed from All Might’s usage of OFA compared to Izuku’s was his ability to somehow shift forms between his true gaunt, thin appearance and his muscular, heroic form for performing on the job. All Might’s comparison to somebody with a flabby stomach "sucking in his gut" to appear better than he actually is might work as a comparison, but still doesn’t really explain how All Might- the first Quirkless user of OFA, is actually able to pull the effect off, up to and including a visible transformation effect of generating steam from his body as he "deflates", which Izuku notably commented upon during the climactic confrontation at the end of the USJ arc as a sign All Might was bluffing about his ability to continue fighting... until recent chapters revealed that one of the Quirks contained within OFA is Smokescreen, allowing the user to generate obscuring cover to hide themselves from sight. Since All might’s focus was similarly on preventing anybody witnessing him transform into his ‘pathetic’ true self early on in the story, and the other vestiges later commented on how well Yagi had adapted to OFA, thanks to his Quirkless body being a natural fit for it, almost to the point of it reaching the singularity stage by the time he passed it onto Izuku, it’s possible that Yagi actually was manifesting partial effects from the other quirks stored within OFA unknowingly, and assumed instead they were merely by-products of his injured body struggling to continue fully utilizing OFA's full power. His blackened sclera might be tied to another of the effects of the remaining quirks stored within OFA, which Deku himself is now manifesting when he’s in combat mode, due to him fully unlocking all the associated powers held within OFA.
    • All Might potentially (and unknowingly) making use of smokescreen is granted more credibility when one considers that Black Whip originally manifested as a result of Midoriya's desire to capture Monoma. It's reasonable to assume that All Might's desire to hide his true form may have served as a similar kind of trigger for the Smokescreen Quirk.
  • For a while, it seemed like an incredibly Contrived Coincidence Kota ended up running into the very same villain that killed his parents during the lodge attack, just so Izuku would have an opportunity to convince him of the value of heroism in rescuing him from Muscular, but it’s heavily implied that there’s more to Muscualr’s presence in the attack than just random coincidence. Looking at the map of everybody’s positions and the order in which they revealed themselves/attacked the protecting pro heroes, it becomes clear that each member of the Vanguard Action Squad is positioned to best execute their abilities in a complimentary manner, and displays uncanny knowledge about which heroes specifically will be protecting the students. Firstly, the Squad takes out Ragdoll at some unknown junction and abducts her before the attack even fully begins, taking advantage of the fact she’s the furthest away from the group, and also preventing her Search from being used to locate all the students when the attack commences. AFO’s comments in Kamino Ward afterward indicated that abducting her so he could steal her Quirk was a priority for the villains, second only to Abducting Bakugou himself, which comes into play with Tomura later being able to use Search to accurately keep track of Izuku and OFA, showing that AFO was fully aware that the Pussycats were the designated heroes assigned to watch over the students and worked that into his plans. Mustard then begins unleashing his gas throughout the forest to subtly poison all the students before they realize they’re under attack, ensuring that there will be students who are harmed from the incident even if the Vanguard Action Squad ultimately fail to kill or main any of them, which fits both Dabi and AFO’s overall goals of worsening the public image of UA and the ability of official heroes to protect others. Dabi then lights a fire to distract and confuse everybody, drawing out the teachers in the lodge so he can launch a sneak attack on them via Twice’s cloned version, and working together with Twice to continue sending a steady barrage of Dabis against the best-fortified building around as disposable Suicide bombers, going along with Dabi’s self-destructive Quirk, preventing reinforcements from reaching the clearing or the Pussycats being able to safely escort the students back to the lodge.
    • Magne then uses her magnetism ability to draw Pixiebob close for an unavoidable sneak attack before they’re even fully aware of what’s going on, preventing her quirk from being used to protect the kids from the blaze or keep the villains at bay with temporary fortifications. note As well as that, there are two villains assigned to each loop of the forest path, one sneaky villainnote  Partnered with one brute-force villain note to best complement each other’s preferred fighting style whilst they search for their target. note  The only odd one out is Muscular, who admits that he "came up here for the view"- and based on the fire in the background, the cliff must face south-east- meaning the only thing that can be reasonably seen from there is the clearing where the other Pussycats are. Given how coordinated the other villains are, and how Muscular notably has a much-lower intellect than the rest of them according to the databook, it’s highly likely his intention- and assigned goal during the operation- was to join up with Magne and Spinner in the clearing, but he got lost in the forest, then distracted by a ‘fun toy’ along the way. If Muscular had joined the clearing fight, his brute strength would have been the decisive factor in taking out the next most important target on the priority list- Mandalay. Without her, the heroes lose all communication throughout the forest and cannot regroup the students.note  Though it’s never stated, it’s implied that Mandalay needs to concentrate and keep a clear mind in order to effectively use her Quirk- and with her sister’s killer staring her straight in the face and laughing about how much fun he had killing her, Mandalay wouldn’t have been able to concentrate enough to get any messages out to the kids in time. This means that it wasn’t a coincidence that Muscular ran into the surviving family members of one of his victims- rather, he was likely recruited specifically for this job because he’d killed Mandalay’s sister, with his usefulness as a powerful attacker being a secondary concern. It also means that Izuku unwittingly interrupted one of the lynchpin moves in the League of Villains' plan when he ran off to rescue Kota, and took out one of their strongest foes before he could even make a move to seal their victory, explaining why the fight starts to turn against the Vanguard Action Squad after Muscular goes down.

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    Fridge Horror 
  • Because of how Quirks work in general, anyone at any time could be born with theoretically any power, ranging from seemingly harmless (like Mineta and his sticky balls) to terrifyingly broken (like All For One and his limitless ability to steal Quirks). This is easily Paranoia Fuel in itself considering the sheer range of Quirk users already introduced, like how one (who is thankfully a good guy) has the power to brainwash anyone who replies to him, and another (a genuine villain) has the power to disintegrate everything he touches.
    • The latter even applied his power to his whole family by accident, which also raises the question of how many accidents happened simply because a Quirk user was born with a power they couldn't control, or how often it's happened by now.
    • Eri herself had a similar scenario with the one above — by accidentally rewinding her father out of existence. By the end of her arc, she's Conveniently an Orphan because her mother disowned her and her grandfather was in critical condition.
    • Less horrifying, but still bad: Present Mic was born with his Quirk active. How exactly did they manage to keep him from harming anyone until he was old enough to understand that his voice- a baby's only form of communication- hurt people badly enough to damage their eardrums?
  • Hawks' mother had extra floating eyeballs as her Quirk, and she could see through all of them. Imagine running into her on the way home at night.
  • Just the fact that there are superpowers in a world that once did not have superpowers is frightening. Dictators, religious extremists, and anyone who has no regard for the lives of others may have gained the upper hand. The fact that the series focuses solely on Japan mitigates the global implications of the possibility that terrorists and tyrannical systems gained superpowers. Just what is the world like outside UA?
    • It is even worse to imagine what it was like when superpowers weren't in 80% of the population. Back when it wasn't even 10%, all it would take is one person with a powerful Quirk to have ambitions of personal conquest. All For One was subtle about it, but the odds that someone didn't try and take over a country openly with a powerful Quirk is highly unlikely.
    • While one hasn't been properly introduced yet and the other is only just being fleshed out as of June 2019, Gentle does mention two villains called Destro and Oji Harima, both of who are just as infamous, if not more so, than ALL FOR ONE! And Destro is said to be the leader of a group called the Quirk Liberation Army. Meaning this may well be a case of Ascended Fridge Horror (and it was).
    • It's possible that Destro's more interested in removing limits on Quirk usage, but the 'Liberation Army' part does bring to mind a terrorist or some such organization.
    • Both are true, as it turns out. The Liberation Army battled entire countries to reduce limits on Quirk/meta ability usage.
  • While the observation that a lot of the heroes in the Top 10 have Quirks that are Difficult, but Awesome can be a sign of good work, there is another possibility. All Might describes All For One going after strong Quirks when talking about the comparative weakness of his predecessors's base Quirks, and All For One would have been very active until very recently in canon. It is possible that the reason most of the Top 10 heroes either have really difficult Quirks, or fairly mutant Quirks, is that All for One would have stolen the powers of people with a lot more simple and powerful Quirks quickly. Further evidence is that a lot of the heroes highly ranked with more traditionally simple and powerful Quirks like Miruko, Kamui Woods, and Ryuku are 26 by around the time that All Might retires, putting their debuts at 20ish around the time All For One was presumed dead.
  • When explaining to Midoriya why he's going through such rigorous training by cleaning up a beach, All Might says that if an unprepared vessel inherits One for All, their limbs would fly off and their entire body would explode. Uh, how exactly does he know that?
    • Perhaps it happened to one one of his predecessors, who tried to pass it to a weak person. After that, the knowledge was passed on to avoid repeating the same mistake.
      • Chapter 304 introduces the fourth user of One For All, Hikage Shinomori, who cultivated One For All for 18 years. In his final years, Shinomori's body began to rupture and passed away at the age of forty. At that time, Shinomori believed that this was because he did not train his body properly and so he likely passed down the advice that a decent level of physical fitness was a prerequisite to inherit One For All. Although decades after his death, Shinomori learnt the true cause of his death from All Might: Rapid Aging due to One For All leeching his life force. This drawback doesn't affect All Might or Izuku since they were born Quirkless.
    • More likely than not, he was referring to when Midoriya used his powers for the first time. We see it breaks his bones, but if his body was any weaker, he probably would have completely lost the limb. Likely All Might is extrapolating from his own bone-breaking injuries when he was in training.
      • Nope. All Might confirms later on that he could use One for All at 100% right off the bat, without any issues, and that he isn't really sure why Midoriya's having so much trouble.
      • The reason why Midoriya is likely having trouble is because of a concept called "Quirk numbers" introduced in Two Heroes, and the doctor who turned out to be working for All For One. The same doctor that claimed Deku had no Quirk. Think about that.
      • Not quite. He diagnosed Izuku as Quirkless due to a) the failure of a Quirk to develop and b) the present of a pinky toe joint only present in Quirkless people. It's extremely unlikely the doctor stole Izuku's Quirk; he wouldn't have even come to see him if Izuku had been exhibiting a Quirk before that.
      • Reminder that the doctor himself diagnosed Izuku though (who, and I repeat, works for someone that steals Quirks). He could be lying about Izuku's results (or maybe stealing ones Quirk regenerates a pinky toe joint, so he's dancing around the truth). The doctor lying and stealing his Quirk makes more sense than Izuku, for absolutely no reason at all besides "plot", is one of the remaining percent. Both of his parents have Quirks, after all. Also, what makes you think that he wouldn't have come to see him if he hadn't developed a Quirk before? He certainly Would Harm A Child, after all.
      • Just because something is unlikely does not mean that it cannot be true. Right now, the idea the Izuku had his Quirk stolen is mere fanon.
      • To add to that, Midoriya had gone there because his quirk hadn't developed and, besides sudden mutations like that of Shigaraki, his theoritical quirk should have been either his father's, his mother's or a combination, none of which look very useful and would fall among the more quirky quirks that he isn't fond of stealing (hence why Blue Jeanist is still in active). Midoriya developing a poweful mutation quirk is just as likely as him being an atavist quirkless, and the latter makes more sense given that, on one side, there is no way to know what a quirk will be until it develops (so it would be the height of stupidity to steal an unknown that would most likely be a dud), when stealing a quirk you cannot steal the control on it but you do steal the raw power it has developed (so it's way better to steal mature quirks as opposed to dormant ones) and an hospital sees a lot of patients which could be targets for quirk stealing, but the region doesn't seem to have a higher ratio of quirkless kids, and on the other side it hasn't been mentioned that any of the unquirked characters has had the bones growth (it may seem that's just an extra bone on the most useless appendage ever, but it's enough to cause discomfort when walking normally, which would have been mentioned).
  • Endeavor and his wife did not have a happy relationship — given how he only married her in order to produce a child strong enough to surpass All Might. She was absolutely aware of that. Knowing this, it doesn't take much to infer that he likely forced her into intercourse, just like he pushed her into a loveless marriage.
    • It gets worse when you realize how Todoroki has three older siblings — this means that Endeavor forced his wife to go through intercourse multiple times.
    • His indifferent expression when telling Todoroki how his mother is in mental care also sadly makes sense. After having finally gotten the heir that he'd always wanted, he couldn't care less about her.
    • A scary comparison to make: Endeavor basically sought out someone with a Quirk he wanted to mix with his own and had a kid who basically has both a Fire and an Ice Quirk. That isn't all that different from All for One putting a bunch of Quirks into someone to create a Nomu.
    • It gets even worse. With All Might retiring after his fight with All For One (promoting Endeavor to top hero by default in the process), it means that all the suffering that the family went through due to Endeavor and his obsession with producing a strong child ended up being All for Nothing.
    • However, much of what was assumed does not make sense given how the implications are they got married when Endeavor would only be likely twenty. Barring the far-fetched possibility that Endeavor was considering starting a family when he was just a rookie hero, this paints questions over a lot of this.
    • As of now, Endeavor's abuse still isn't known to the public, something which his son Natsuo is particularly upset about. It calls to mind the many instances in real life of celebrities and other respected figures getting away with horrendous actions without being held accountable until years later, if at all.
    • Though the latest chapters showcase that Enji and Rei used to love each other at first and that Shoto's siblings were not conceived through forced intercourse, the fact that Endeavour became the jerkass hero we knew by the time Shoto is five showcases how much of a Sanity Slippage did Enji had over his rivalry with All Might.
      • Or due to the fraticidal rage and supposed death of the son he had been training before, given that it seems like comments about him weren't uncommon during the spartan trainings.
  • It's shown that Kaminari Denki's electricity Quirk, if overused, shorts out his brain and turns him into an idiot for a while. His Intelligence stat is at 1/5 and he has the worst grades in Class 1-A. What if each time he overloads, a little more of his brain is permanently damaged? What if eventually, one overload will permanently turn him into a vegetable? It certainly makes those times his friends forced him to overload much more cringe-worthy to look at.
  • In an Omake within the 7th Volume; a fan asked the author, Horikoshi, why the winged Nomu from the Stain Arc specifically picked out and took off with Midoriya. Horikoshi answered "I will do my best to explain about Nomu later on" — along with a drawing of a boy seen in the very first chapter, as one of Bakugo's friends (and thus by extension acquainted with Midoriya), during childhood. That boy's Quirk was having wings.
    • Adding to it was that he wasn't seen in middle school with Katsuki and his other friends, meaning that he either moved away or All For One took him when he was still in elementary school.
      • Fan theories make that one even worse when you consider that he was revealed to be the grandson of the doctor who told Midoriya he didn't have a Quirk. The same doctor a lot of people assume to be the same one we saw with All For One.
      • It was recently revealed that Nomu are made from corpses. Unless this kid is an exception, the Doctor most likely killed him as a prerequisite. Adult Fear, indeed.
  • Due to the way Magne's Quirk works, the package with a magnetic bar she used in the invasion has some disturbing connotations... Looks like it would've had female and male parts from mutilated corpses mixed inside to work as a magnet. Unless it's just something more along the lines of a harmless hair sample, in which case, that's fine.
  • Toru is invisible, all the time, and said Quirk does not apply to her clothes. This has a couple of unsettling implications if you think about what could happen:
    • Since she has to be naked for her Quirk to be useful at all, this means she cannot be wearing any sort of armor or protective gear when she fights, and she's never implied to be physically stronger or tougher than a normal person. This puts her at very high risk for injury due to any villain who's capable of perceiving her via their Quirk or who has a wide area of attack. She's also at high risk for collateral damage since her allies can't see her any better than villains.
      • It could've happened very easily when UA was first invaded by Shigaraki. She had been teleported to the plateau with Todoroki, who was unaware of her presence. He used a wide range ice attack which she's lucky not to have been caught in since he implied prolonged exposure would harm the victims.
      • There are other practical concerns with being naked of course. For starters, she's barefoot, which means that she is vulnerable to injury from stones, broken glass, insects, etc. as well as from both frostbite and scolding depending on the temperature. And speaking of the elements, whilst she may have a certain protection from UV rays (although UV and the visible spectrum are actually two completely different things), on a cold day she would quickly run the risk of death.
    • There's also no indication that her Quirk turns off if she's injured or unconscious, which means that if she is injured in battle, her allies aren't going to be able to protect her or give her treatment unless they're lucky enough to stumble onto her without hurting her further.
    • And even if they do find her, unless they have someone like Recovery Girl on hand, treating her injuries is going to be almost impossible since nobody would be able to see exactly what they're doing. Would Tooru even know how badly she's been hurt aside from knowing where the pain is or what isn't responding to her anymore?
    • And then there are the psychological effects of being invisible 24/7; remember The Invisible Man?
    • While the manga seems to imply Tooru's Quirk is light-manipulation based (as mentioned on her character page) and mean that things like her eyelids could be blocking out light like everyone else's from her own perspective Mirio's Quirk brings up an interesting point for other "invisibility" Quirk bearers: Light passing through a person's eyes without catching any light (which assumedly would make at least the pupils of the eyes visible) would mean that person is blind as long as they are invisible, and even if they weren't blind to start with eyelids that can't protect them would put them at higher risk of going blind anyway.
  • Recovery Girl's Quirk is so rare and so useful in healing other people who are hurt by U.A.'s rigorous training and recently, villain encounters, that one must wonder how far back U.A. will be set if she dies.
    • Fortunately, most people with healing Quirks seem to go into medicine, and there seem to be specific laws allowing healers to heal people, so a school of UA's prestige would likely find another.
  • The Reveal of Toga Himiko's Quirk is full of this:
    • First, the real Camie is either dead or has been kidnapped by the villains and possibly used to create a new Nomu.
    • If Toga has been impersonating Camie for three days straight, does that mean she has gone to her home and interacted with Camie's family without being discovered? Imagine those folk going about their lives as usual without noticing anything aside of their daughter/sister acting "a bit weird lately".
    • Toga can, as far as we know, impersonate Izuku and Ochaco with only people who know them really well being able to tell the difference. The things she could do with this advantage are pure Paranoia Fuel.
    • This is alleviated with the latest Hassaikai Arc giving an explanation. Toga can only maintain about a day with a cup of blood, meanwhile, the blood she got from Izuku doesn't fill a full cup. So she can't hold the transformation for long either way. Though still, the Paranoia Fuel is still there.
    • Also, how much blood would Toga have taken if she was able to impersonate Camie for three days straight?
    • A little alleviated that Camie is alive in Chapter 164.
  • Himiko's Blood Lust. We know that she has killed people before, so what was stopping her from violating their corpses afterwards?
  • The fact that One For All grows stronger with each user. Normally, this would be an unquestionable benefit, but in this case, it also puts a heavier strain on the user's body. While this can be overcome by learning to only use a fraction of the power, it can be hard without first getting used to the Quirk, meaning eventually the Quirk will become useless as its first use would just tear the user's body apart well before they can learn to control it.
    • This also highlights the benefit of passing One For All to a Quirkless successor, as Nana did with All Might and All Might did with Deku. Because that person doesn't have any extra power outside that of a normal human's to add to One For All, the power compiled into it for each new Quirkless user is greatly lessened when compared to passing it on to someone with their own Quirk. This, theoretically, helps delay that dangerous "using this power equals death" scenario that could happen many, many generations down the line.
      • Hopefully, they will take a lesson from All For One and pass it to someone with shock absorption, regeneration, or some other Quirk that could mitigate the damage.
  • Once the One for All's owner selects a successor and passes the power, the previous owner starts losing his/her power as the successor grows stronger. That means that, when Sensei went after Nana, who had already passed her Quirk to All Might, she wasn't even close to her prime while he was at his best; considering that it took All Might's full power to defeat him the first time, Nana was on the receiving end of a horrifying Curb-Stomp Battle.
  • Kirishima has a minute scar in the upper corner of his right eye from the moment his Quirk activated for the first time without warning and he accidentally sliced himself while rubbing his eyes. What if he rubbed his eye a little lower?
    • Here's a fridge horror based on that: think of all the ways the class found out about their Quirks. Sato for example probably ate some sugar at some point and became a really strong, mentally slowed toddler. Think of how often little kids are offered cookies, juices, and other things with sugar in them, and imagine how that might turn your kid out of nowhere into the equivalent of a gorilla. That's not even getting into some other Quirks that could have been really unpleasant or Adult Fear inducing to discover at random...imagine baby Mt. Lady randomly growing massive one day and how that must have freaked her parents out.
    • We've seen how Tokoyami's Quirk gets very uncontrollable and dangerous at night. And that's when he's a teenager. Now, what about when he was just a small child who had only just found out about it and didn't understand? The Adult Fear scenarios are through the roof. Did his parents tuck him to bed and turn off the lights only to wake up seeing this unknown menacing shadow tearing up their son's room? What kind of psychological effects could have on him?
    • It gets even more horrifying with some of the Quirks we've seen that can't be turned off... like Shigaraki's "Decay" Quirk. It's implied that he inadvertently killed his own father with it as a very young child.
    • Try 'his entire family', per Chapter 222. Where do you think he got his hands?!
  • The knowledge that Bakugou's Explosion is the result of the combination of his parent's nitric acid and glycerin Quirks is at face value a neat little bit of trivia. Then the Quirk Singularity is described as new, more powerful, and uncontrollable abilities emerging from different Quirks mixing over the generations. Bakugou's strength may not just be the product of all his training.
    • Granted, Bakugou's Quirk wasn't nearly as powerful when it first manifested, since he could only create small sparks as a child. But if he truly is affected by the Singularity, any children he has might be able to produce larger and more erratic explosions right off the bat.
  • In Episode 28, a newspaper is seen with pictures of five heroes killed by Stain. At least one of them was among the background extras in the Sports Festival Arc.
  • The fact that Sir Nighteye's death along with Mirio losing his Quirk could have been prevented if Midoriya and Mirio decided to save Eri when they first saw her makes this a Fridge Tearjerker than anything else. The full weight will certainly crush Izuku, assuming he hasn't figured it out yet.
    • It will be even worse for Mirio because he was the one who stopped them from saving her. Particularly since his Intangibility would have made it easy to defeat Overhaul at that time (Overhaul has to touch people to affect them which gave Mirio a considerable advantage against him as seen when they actually fought).
  • The sheer amount of Quirks that the Nomus, and by extension All for One, have, raises the question of just where they keep getting them. How many people are sought out and dragged away for power confiscation? More unnervingly the fact that this went unreported or untraced makes you wonder what happened to the people whose Quirks were removed, seeing as the process didn't kill Ragdoll.
    • Fortunately, this one was at least a bit explained with the introduction of someone who can copy stolen Quirks permanently – one person's durability Quirk could have been reproduced 100 times rather than 100 people getting kidnapped and getting their Quirks stolen.
    • A lot of unease can come about when one thinks about all of the possible Quirks he could have taken. One for All is terrifying enough, but if he had taken Quirks as potent as Present Mic's, Shoto's, or Aizawa's, that might have tipped the battles against All Might into a very bad direction.
  • How important Izuku/Deku is to the well being of the dramatis personae of the story at large:
    • If Izuku didn't exist or wasn't in the right place at the right time Katsuki Bakuguo would likely have died at the hands of the Sludge — unless he was absolutely essential for the villain's second escape.
      • Izuku may have been the reason All Might lost the bottle holding Sludge when he grabbed onto his leg, so Bakuguo would probably be safe.
    • Assuming that Izuku didn't inherit One For All and end up a UA, Mineta and Asui may well have been killed by the aquatic villains of the League during the attack on the USJ.
      • Without Izuku inheriting OfA, All Might would likely be teaching Mirio's third-year class. As the League attacked the USJ when they did because they had stolen a schedule stating that All Might would be present at that time, if All Might isn't one of 1-A's teachers, the League would not have attacked during 1-A's training.
    • Without Izuku at UA, his fight with Shoto Todoroki wouldn't have happened and Todoroki's realization — and subsequent character development — that his power was his, not his father's — wouldn't have occurred, at least not at that time.
    • Without that development, Shoto likely wouldn't have interned with his father and ended up in Hosu, absent as well would have been trainee hero Deku interning with Gran Torino — both ending up in Hosu.
    • Without Izuku and Shoto, Native and Tenya Ida would both have likely perished at the hands of Hero Killer Stain, who would likely still be at large.
    • Since he wouldn't be training Izuku/Deku as the successor to All Might, Gran Torino wouldn't have been in Hosu during the attack by the League of Villains and their Nomu, likely leading to the death of several more civilians and a more difficult fight over all.
    • With no Izuku, Kouta would have almost certainly been killed by Muscular during the School Trip fight with the league.
      • With no Izuku, the attack on the school trip would have been very different from canon, if it happened at all, as the villains involved in the attack joined the League because of Stain's big speech. Without Izuku, Stain would likely still be at large, resulting in the other villains not being inspired to join the League. Also, it was worried about the likely growing strength of the League that prompted UA to shift the school training trip to the woods, so avoiding that, Kouta would have been nowhere near the training trip and any potential villain attacks.
      • Also, it's confirmed at least part of the League's fascination with 1-A is due to Shigaraki's fascination with Izuku. The traitor who revealed the location probably also revealed that All Might wasn't going to be there, so it's not like they were targeting him. Their show of power could have been somewhere else without the draw of Izuku being there.
      • With no Izuku to fight Stain, the outcome would have been far worse. Iida went after Stain on his own, and Midoriya rescued him. With no Izuku, Iida and Native (the other hero Stain got a hold of) would most certainly have been killed. Think of how the death of a student during an internship would have affected UA.
    • How important Izuku was to rescuing Bakuguo is a matter of debate but anything from the attempted rescue not happening — potentially letting All For One carry on with his merry madness unmolested — to it failing — leading to several student deaths — or simply succeeding like usual are possible.
    • Assuming that Mirio Togata inherited One For All from All Might as was "originally" intended in the absence of Izuku, if everything stayed the same and he still jumped in front of that bullet to save Eri, One For All potentially would have been lost forever with nothing to counter All For One (Quirk) if either All For One (Villain) either escaped or passed his Quirk on to Tomura Shigaraki. This does assume that Mirio doesn't weigh the importance of One For All — and all the lives it may potentially save — against Eri, and act differently, assuming that he's pretty much the same otherwise, it's doubtful he would choose himself over Eri.
      • This also assumes that the increased strength and speed boosts that Mirio would have thanks to OfA would not have allowed him to defeat Overhaul before the Quirk destroying bullets could be used. In the canon fight, Mirio landed punches on both Overhaul and Chronostasis, which they were able to recover from and continue fighting. If Mirio possessed OfA, those hits would have ended the fight then and there.
      • Not to mention that, thanks to One For All super speed, he would have probably been able to take Eri out of the bullet's way without being hit by it, not to mention that, thanks to the huge training he already had for his own Quirk, he probably would have way more than just 20% by that point, if not directly 100%, so he would most likely one-shot Overhaul anyway
  • From what can be seen on his character sheet/beneath his overall attire, roughly 80% of Dabi's body appears to be either rotting, slightly mummified, or severely burnt. We've no idea how he received those injuries, at least at this point in the series. Given Dabi's "Cremation" Quirk and overall character, it's not inconceivable to think he did that to himself; but it's just as likely he received those injuries in a fight... which must have been some fight. Either possibility seems equally horrific.
    • If Dabi's skin is burned that severely and he doesn't have some kind of pain resistance Quirk on top of it... this troper would hate to be him.
    • Chapter 267 reveals that Dabi is physically incapable of crying because his tear ducts have been burnt away. The psychological implications of that are not pretty.
    • He did indeed do that to himself, and keeps doing so. He has an enhanced version of Endeavour's quirk, but his body is tuned for an ice quirk. And Endeavour's less powerful quirk takes already a heavy toll on him.
  • A bit on the light side here, but Gang Orca is only the THIRD most villainous seeming hero, meaning there are two more heroes each with a more passing resemblance to a villain than him. One can only shudder at the idea of the reasons for that.
    • Just the fact that a list like that even exists is pretty demoralizing. Especially for Gang Orca, who is said to be self-conscious about how frightening his appearance is to children.
  • A big one involving the Heights Alliance and the possibility of a traitor in U.A: now all of the students are in a single place. If the traitor was ordered to eliminate all of Class 1-A or decided that they were nearly exposed and needed to act immediately while they still could, they'd all be in one spot as opposed to being scattered all over Japan as they previously had been. In trying to protect the students, U.A. may have unintentionally made them all the more vulnerable to a single mass murder spree or event. For a rough example of how various traitors could do so...
    • A Toru traitor could slip around completely invisible and stab everyone in their sleep.
    • A Kaminari traitor could start an electrical fire and burn everyone alive in their sleep.
    • A Sero traitor could tape everyone's mouths and limbs down to suffocate them as they sleep.
    • A Jiro traitor could use her earphones to break the building's support pillar, dropping the thing on everyone in their sleep.
    • A Kota traitor could command an army of ants to eat everyone alive, as they sleep.
    • A Mina traitor could burn everyone with acid as they sleep.
    • A Mineta traitor could suffocate people with sticky balls as they sleep.
    • And if the traitor is a teacher, then he/she can easily go to the dorms without being suspected of anything.
  • There's another possibility for a UA traitor that makes it worse. Whoever the traitor is, they could be being blackmailed into it by means of a Hostage Situation and having no choice but to comply with their handler's commands. Think about it; they'd be forced to ruin relationships they probably cherish simply because some asshole decided to turn them into a pawn by threatening their loved one.
    • This would make even more sense if one of them was a student...
    • It's possible that the principle subscribes to the blackmail idea. While All Might believes that his students "have the heart of a true hero", Nezu agreed with him. However, while Nezu may believe in that, he likely doesn't exclude the possibility of them being blackmailed into doing so.
  • Eri's power highlights a terrifying Fridge Horror about Quirks in general: they aren't decided by someone's personality, and aren't some sort of mutant powers that follow standard comic book logic. You're either given them by an outside force, awakened to them by random factors from the spread of Quirks across humanity, or were born with one. Being born with a Quirk can be manipulated, passed on, and even combined in due time, as Todoroki is living proof of — but Quirks can completely disobey genealogy rules at random. And Eri was born with the Rewind Quirk when not a single person in her family line ever exhibited any traits of anything matching it. It's entirely possible that a friend, family member, or even your own children can just suddenly awaken to a new and extremely dangerous Quirk, and kill you, others, or even themselves with it in the process. And there's nothing you can do to prevent or know about it ahead of time.
    • That's not even getting into the potential problems this could cause in families. How many children like Eri or Tenko Shimura in such situations ended up being accused as not being random power mutants, but the results of affairs? After all, Quirks are generally inherited from parents. If your child has a Quirk very different from your own, it is easy to assume it isn't because of a rare mutation.
  • Eri overusing her Quirk on Deku gives her an intense fever. It's unknown if this is a one-time incident or if this happens every time she exerts herself. If it's the latter, imagine how bad it must have been when she used her Quirk for the very first time as a toddler. Especially since Eri's mother considered her cursed and likely didn't do anything to help her sick daughter.
  • The Nomu, High-End, expands upon the Fridge Horror that Nomus were once people. His obsession with strength and finding new opponents, and not to mention the very similar Quirk that allows him to increase/expand his muscles, may remind some people of Muscular. While it's left unconfirmed if Muscular is still imprisoned, this implies that the League of Villains might have got him out and somehow turned him into High End. So not only are Nomus people, but the LoV can make them without All for One's assistance.
    • Fortunately it turns out that Muscular is in fact arrested, that they can duplicate Quirks, and High End was just some other aggressive crook. Not good for the aggressive crook, but Muscular himself is perfectly fine.
  • Remember back when everyone took Aizawa's fitness test and how Midoriya ended up dead last? Seems like a case of Informed Ability since some of the others have Quirks that wouldn't help in any of the tests, but what if it's not? We already know Aizawa would be gunning for Midoriya from the start (as stated by All Might). What if Aizawa deliberately rigged the test just to get an excuse to expel Midoriya? If it's true, then the only reason Midoriya wasn't expelled at all was that he showed his potential to Aizawa during the ball throw. Makes one wonder how many other students were expelled through the same means.
    • Delving into Aizawa's backstory offers some Nightmare Retardant in that the threat of expulsion is actually his method of training his students on how to deal with 'death' by exposing them to scenarios where they could or would realistically lose all hope of their dreams coming to fruition if he either actually followed through on the threat or didn't 'change his mind' afterwards. Basically, he's deliberately invoking Nightmare Fuel in regards to his students' ambitions to prepare them for an unfair and unforgiving career.
  • A lighter horror, but a lot, and I mean a lot of the Sports Festival matches would have been a lot less ideal if one side had lost instead of won.
    • Shinshou vs Todoroki: with how upset Todoroki was, it would not have been hard for him to provoke Todoroki to trigger Brainwashing.
    • Sero vs Midoriya: The move Sero used on Todoroki would have been hard for Izuku to get out of. Breaking his feet would not snap him out of tape, and any broken arms would have stopped him from moving his arms.
    • Kaminari vs Iida: Wide range electric attacks would have caught Iida no matter how fast he moved.
    • Hatsume vs Ibara: Even if she wanted to win, Ibara would be on to her antics, and her vines could tear her tech apart.
    • Yaoyorozu vs Mina: She could produce bases to counter her acid before it could get used.
    • Aoyama vs Tokoyami: His navel laser is one, big, bright light, and Dark Shadow doesn't like light.
    • Teststetsu vs Bakugo: If he could deal with Todoroki's fire, explosions would be much easier even with less training.
    • Uraraka vs Kirishima: Kirishima would not be as prone to hitting her, and even trying to get close would just get her to levitate him into helplessness.
    • Midoriya vs Iida: Plenty of notes, Midoriya has the speed to help handle Iida and the agility to not be directly caught up. He'd also want to get back at Iida for sneaking Recipro by him, giving him motivation.
    • Ibara vs Todoroki: A bit less, but her vines might be able to get past his ice by going underground and bypassing his strategies.
    • Ashido vs Bakugo: Also a bit less, but she'd at least be at a better elemental match-up than Tokoyami.
    • Kirishima vs Tokoyami: Actually fairly less beneficial, assuming Kirishima can't fisticuff through Dark Shadow.
    • Iida vs Bakugo: He could dodge Bakugo's explosions easier and would not have the resource/mental hangup problems Todoroki had.
    • Tokoyami vs Todoroki: Without the fire power in full use, Dark Shadow could sneak around and over the ice attacks with Tokoyami in tow. He'd be harder to lock down.
  • Just what Quirks and techniques did All Might and All for One do to each other to leave them with what injuries they left the fight with?
  • With the revelation that One for All contains the Quirks of its previous users inside of it comes the freakish reveal of the Black Whip, which nearly kills everyone around Midoriya. From the reader's perspective this is already horrifying up front, but think about it from a larger perspective: the community at large just witnessed Midoriya publicly unleash a Quirk he isn't documented for having at all, in a world where such info can spread like wildfire and just about everyone that wasn't an All for One ally or victim is restricted to solely one Quirk by genetic nature. Midoriya's life could become an absolute hell if villains or the wrong groups, in general, learn about him, and it might bring others closer to the truth of One for All without any control over it on his part, much less any way for him or All Might to even predict what might happen.
    • Even worse, what's to stop people from drawing a connection between Izuku and the multi-Quirked Nomu?
  • The fact that Chapter 220 not only made Ascended Fridge Horror the existence of racism against mutant-type Quirks like Spinners, but also that there is an analog to the Klan who pushes for it running around, and given Spinner's own personal history they aren't without supporters still. What of the heroic characters who don't look human, like Ojiro and Tokoyami? Did they ever deal with the C.R.C?
  • Toga's Personality Powers gives a whole new meaning of horrifying come Chapter 226. According to her backstory and Kizuki, her Quirk made her naturally attracted to blood. If this is true, then how many other Quirks are affecting the personalities of their owners? How many villains are just acting on instincts given to them by their Quirks?
    • On that note, does this mean All For One's obsession with stealing Quirks is a result of his Quirk? Or that Shigaraki's desire to destroy everything he hates is because of his Decay Quirk? Evidence for the latter's case is when, as a child, Shigaraki's Quirk didn't activate until he stated "he hates everything". Seems oddly coincidental.
    • Back to Toga, the parents' reaction to her Quirk makes you wonder about their own Quirks. Either they had totally different Quirks and Toga was a shocking mutation a la Eri, or they had similar Quirks that were repressed in similar ways. The only difference being they hadn't mentally snapped like their daughter had: yet. It also has the darkly hilarious thought that if they do have similar Quirks that Toga would probably be mentally healthier if her parents were villains who fully embraced their Quirk and took said daughter off on blood 'hunts' (or kicked her out right right then and there with the first bird).
  • In Chapter 230, Geten states that, in the society envisioned by the Meta Liberation Army, one's standing in society is tied to how powerful their Quirk is. That's harsh enough already, but... what would that mean for the tiny percentage of Quirkless people still popping up out there? What would happen to a pre-One For All Izuku in that kind of society?
    • This is mitigated somewhat by the fact that the Social Darwinist society seems to be only his own vision. It's still unclear what the Re-Destro's vision (let alone everyone else in the army) is.
    • When Slidin-Go tries to pull rank on Hawks he is told off by Skeptic because Hawks is more useful to the league than he is due to the quality of intelligence he provides. The MLA clearly has no respect for loyalty as long as they can obtain an advantage in their operation. What kind of society would these guys build?
  • Fridge Tearjerker. Shigaraki became a villain because nobody but All For One bothered to lend a hand to him at his Darkest Hour. How different would Shigaraki's life have gone if instead of All for One, All Might saw the hurting child and lent him a hand?
    • Gets worse when you consider the implications and All for One's declared standard operating procedure of finding people at their lowest point and twisting them to his own ends. He finds and takes a kid who just killed his whole family by accident with a Quirk he had no way of controlling that had awakened in response to parental abuse by his father. He then proceeds to invoke psychological torture on the kid by presenting him with the severed hands of his family to wear as a reminder. And given how much of a Psychopathic Manchild the kid grew up to be, you can bet that healthy emotional outlets weren't something All for One felt important to teach. Also, given that he managed to get to the kid before any of the authorities, just how long was he watching the Shimura family, waiting for something like what happened?
  • Not much "horror" but still uncomfortable to think. It's been known since their establishment that the hidden purpose of the dorms is to monitor the students more closely by having them living in a single place. As of Chapter 242, set four months later, no conclusive evidence to pinpoint any suspect has been found. So while the question of whether the spy is one of 1-A's students or not still lingers, another can be raised: how much have they pried into their privacy? For all we know, the dorm may be full of hidden cameras and microphones.
  • Not as terrifying, more disturbing to consider: Ibara's Quirk turns the hair on her head into vines. Is it just her head though? Does it affect every body hair she has, even if artistic styling mean it isn't really visible? Is her entire body covered by fine thorns that make hugging her like hugging an abrasive sponge? If she was a guy, had brothers, or inherited the Quirk from her father, would said guy's chest be covered in a spiky version of a Carpet of Virility? Is her armpit housing a little nest of thorns she could shoot out as an emergency thorn (even if that is probably the least likely due to how her Quirk needs sunlight)? Does she have vines instead of pubic hair she could use in a pinch akin to the Lovecraftian Superpower or Vagina Dentata tropes? Heck if you really want to wonder about this trope, look at her casual clothing, you'd notice how much of her body it covers. Could just be her being a devout character, or it could be her trying to minimize sunlight contact with parts of the body she doesn't want it on...
    • Possible, but unlikely. Have a good look at an image of her, and you'll notice that she has very normal eyebrows, without so much as a tiny bit of green on them. If it really did affect all her hair, her eyebrows and eyelashes would likely be part of that. Her very modest clothing is likely just because she is a modest girl.
  • Quirks are explicitly mentioned as being a part of the person using them, something that they consciously control, to varying extents depending on the specific nature of the Quirk. So, what happens if someone with a Quirk has a seizure? Or, in a similar vein to Man of Steel, Woman of Kleenex, they lose control of their Quirk during orgasm? Deku would be bad enough with just the super strength, but what about Bakugo? He sweats nitroglycerin and has the ability to consciously ignite it, but the first part is an always-on thing, so if he lost control during the moment, his entire body would be covered in nitro. Talk about Nightmare Fuel...
    • It would depend on the specific Quirk. Some Quirks require concentration to be activated, which means that scrambling the user's concentration would make them unable to activate their Quirk (or deactivate it, if it was previously active).
  • With the reveal that Kurogiri is a special breed of Nomu created using the body of Oboro Shirakumo, a classmate and close friend of Eraser Head and Present Mic during their UA days who died during an internship, it raises many disturbing possibilities about where all the other Nomu came from, as well as how long All For One and the Doctor were making them.
  • People say that there's no one All Might has failed to save when he was on-scene. We know, however, that All Might was present at the second incident with the Sludge Villain, and due to his hero timer wouldn't have intervened unless Izuku had been there reminding him of what it meant to be a hero. How many times has All Might been on-scene, but unrecognizable, and consciously decided not to help?
  • When you think about it, Kota is really lucky that he punched mild-mannered Deku in the balls and not, say, Bakugo who just so happened to be standing right next to the latter at the time. The next time we saw Kota he may well have been sporting a face like Todoroki. This also would have interesting implications for Bakugo and the rest of Class 1-A given how the rest of the arc plays out, especially if he was punished for retaliating.
    • Regarding that, it was pretty much the Pussycats' fault for taking Kota with them at the camp and not keeping him away from the students, not even after kicking Deku. Also, some counseling, or maybe just seeing a clip of a hero risking their lives to save someone or talking to someone who has been saved by a hero, might've changed his perspective on heroes
  • In Chapter 270, it is revealed that Oboro Shirakumo's death was not an accident, but planned by Kyudai Garaki and that the original target was Shota Aizawa, or more specifically, his Erasure Quirk. Just imagine if they had succeeded and the villains had this Quirk in their possession. They could have duplicated it and then given it as a default to every High-End Nomu like they do with Super Regeneration. The heroes would have stood no chance whatsoever.
    • Garaki's presence in the story is what elevates AfO from a crime boss to an Evil Overlord, he provides the technical expertise to duplicate powerful quirks so that AfO doesn't have to give up the original, creates the Nomu, facilitates monitoring and theft of strong quirks through his orphanages and hospitals, and acts as the general support system for the League of Villains.
  • What did Moonfish do to wind up on death row, when known serial killers like Stain and Muscular didn't?
    • Seemingly cannibalism. Though we don't actually know their state so it is possible that Stain, Muscular, and All for One are either on or being pushed to go to death row as we speak.
  • In his big reveal to Endeavor, Dabi mentions that he'd originally planned to kill Shoto, most likely when the kid was reaching fame but not powerful enough to make it impossible, but then Endeavor being named the top Hero made him change his plans. Shoto probably dodged a blazing-hot bullet inadvertently thanks to his dad; imagine dying at the hands of a brother you thought was long dead.
    • Of course, it's doubtful Toya/Dabi is gonna just turn Endeavor to ash and be like, "Okay, revenge complete. Wanna grab some noodles, bro?" afterwards...
  • Throughout the series All For One often said he was making Shigaraki "the next me". At first, it's easy to assume he meant his successor, like how One for All is passed down. Come the Paranormal Liberation War arc, and we learn that, thanks to Shigaraki now having the original All for One Quirk, All For One (the villain) can do a Villain Override and take control, though Shigaraki does fight it. This makes one wonder what All For One exactly meant by "the next me".
    • Even worse, the fact that he seemingly knows exactly how the transfer will work raises the possibility that he's done this before.
  • As we see a flashback to Hawks' horrifying and abusive childhood, it's too clear the relationship between his parents was devoid of any love, as it was his conception which his father viewed like a curse. At best, there may have been some attraction in the past until his mother was accidentally knocked up; at worst, it's too easy to imagine he's the fruit of his father forcing himself on her. Moreover, it's a blessing a series of circumstances allowed Hawks to rise up from the hellhole he grew up and become an hero, as otherwise his fate could have been to eventually follow in his father's footsteps, ultimately becoming a terrifying villain due to his Quirk with the only hope to the contrary being the possibility the Quirk required more intense training than a street thug could give himself to use as well as Hawks does as a hero.
  • Come Chapter 300, we have a different horrifying reason why civilians taking matters into their own hands is a bad thing.
    • By the time heroes like Wash show up, several people are injured and/or dead — either the attackers who were outfought with support items, or the inexperienced civilians failing to safely use them against their assailants.
    • Unlike their American counterparts, whose culture is rooted in discipline, self-defense, and protection of their own through deterrence, the Japanese population has virtually no training or ingrained values to properly handle these new support items.
    • And while guns are common and predictable enough to anticipate, the variety of quirks has led to an increase in paranoia, as no one knows what trick the next wielder has, leading to dangerously unpredictable consequences.
    • And let's talk about entire towns and shops arming themselves with these weapons — parts of Japan would eventually be fragmented by warlords exerting control over entire areas, not unlike what happened in Somalia — assuming All For One hasn't usurped them first.
    • Combined with rhetoric and a demoralized population, not only will countless civilians engage in vigilantism, no one will trust each other. Lynchings, accusations, the court of public opinion will not be kind to certain individuals who looked at the others in a funny way.
  • At the start of the story, All Might was planning to scout a successor to inherit One For All while teaching at U.A. Then he decided to give the Quirk to Izuku Midoriya, a Quirkless but heroic boy. All Might's old sidekick, Sir Nighteye expressed doubts on his choice (believing that Mirio Togata should have inherited the Quirk), but All Might stuck to his decision. About 300 chapters later, it is revealed that One For All depletes the life force of any Quirk user who inherits it. What is scary is that none of the One For All users knew of this until recently. In other words, had All Might followed his original plan and gave One For All to someone like Shoto or Mirio, they would have quickly died prematurely, without anyone knowing the true cause, and One For All would come to an abrupt end. All Might and Izuku can wield One For All without losing their vitality because they were born Quirkless. The first user of One For All lampshades it, stating that Izuku inheriting One For All from All Might was a miracle that ensured One For All's continued existence. This also means that Izuku is fated to be the final wielder of One For All, since at this point, no other human can wield its immense power.
    • This logic doesn't follow as One For All can still be transferred to someone else without killing them if Izuku finds someone Quirkless to give it to. Plus, if the problem is life force being drained, then giving One For All to someone with a healing Quirk would mitigate the damage — and as later users of One For All gain the Quirks of previous users, then it is entirely possible to remove this problem forever.
      • Except that even a Quirkless recipient like Midoriya is struggling to wield One For All due to its immense strength. Even if Midoriya does find another Quirkless recipient and transfers One For All after training them, the new successor will not be able to use One For All without wrecking their body. It can be possible to transfer it to someone with a longevity Quirk, but the odds of finding that candidate is as hard as finding a Quirkless person. If it is transferred to a person with a healing Quirk, it will still not resolve the issue of life force depletion.
    • If Izuku is genetically Quirkless (and not one who had his Quirk removed as some theories go) it might be possible to specifically have a child who is Quirkless with targeted gene selection. In real life, it is possible to aim for certain traits to either avoid a condition or even to encourage it, such as dwarfism. However, if Izuku (and a Quirkless woman) were to specifically do that they'd more or less be intentionally crippling the child and hoping they don't resent their parent so much for it they become a villain with One for All instead. Izuku would also have to convince a 'Mrs. Midoriya' to go along with the plan, which may not be easy or well-conducive to marriage health (if a marriage or any type of relationship would even be necessary, considering modern genetic technology like artificial insemination, in-vitro fertilization, etc.).
  • Let's talk about the actions of the Hero Public Safety Commission, shall we? On the surface, the commission has the public's trust just as much as they (used) to trust heroes. Then we learn some of their more dubious actions, like taking in Hawks and turning him into a Tyke Bomb. THEN we learn about Lady Nagant, and how the HPSC used her as their personal hitwomen, having her assassinate potential threats to Hero Society (from villains, to heroes whose actions would've tarnished the public's view on heroes, to regular people who simply were simply talking about going against the establishment) even before they actually commit crimes. What other actions did the HPSC do to maintain this "peace"? How long have these actions been going on?
    • According to Yokumiru Mera in the Provisional Hero License Exam Arc, the HPSC is understaffed, which is why he's so exhausted from overworking. At first, this seemed to be a simple gag. Then we learn about the HPSC's more dubious actions. Is the reason the HPSC is understaffed because some members wanted to change or expose how the Commission runs things and had to "disappear"? Did they try to leave only couldn't? Or, a bit more mundanely, do the higher members of the commission simply not hire new staff so they could keep more cash in their pockets?

    Fridge Logic 
On the headscratchers page.

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