Follow TV Tropes


Headscratchers / My Hero Academia

Go To

Headscratchers are questions that remain after you're finished with the work, so all spoilers are unmarked.

    open/close all folders 

    All Might's Injuries 
  • All Might says that he lost a lung and his entire stomach in a fight with a villain. My question is if he doesn't have a stomach anymore, how is he able to eat? He's seen drinking tea and I'm pretty sure there was at least one part where he was eating something, so did he get some kind of replacement?
  • It’s actually possible to live without a stomach. After a total gastrectomy, the esophagus is hooked up directly to the small intestines. The patient is hooked up to IV feeding to allow time for the intestines to adapt, but yeah.
  • Side effects would include decreased nutrition, weakening of the muscles and bones, significant weight loss, and anemia in extreme situations. Which fits All Might’s “weak” form’s physiology.
  • All Might's had numerous surgeries and sessions with Recovery Girl between his first battle with All for One and the start of the series to cobble his ruined organs together into something functional. That he's able to function on a basic level without help, let alone continue being the world's top hero (in short bursts) in his condition is near miraculous as well as a testament to both the power of One for All and his sheer determination.

    Midoriya's Recoil 
  • Why didn't Midoriya have his hero uniform made with something to absorb the shock from One for All? I know he wanted to use what his mom gave him, but there's no reason he couldn't have had it modified.
    • Where and how could you modify it though? The stress is from his own muscles on his bones and cartilage. So unless his "Costume" was to go full Wolverine and have his bones replaced with "Superstrong, Doesn't Exist in Real Life" metal... There's not much that the costume could do besides act as a splint. Boxing wraps only work because they are keeping the wrists from incorrectly distributing the force. That isn't supposed to by Midoriya's problem. It's that there is just too much force for his body to handle no matter what he does.
    • Midoriya breaking his bones after each use of One for All comes from Newton's Third Law, unfortunately, as was seen when he first punched Nomu and didn't break his arm due to one of Nomu's quirks—Shock absorption, which took the entirety of the impact. That being said, considering the pure power that One for All can put out from just a single punch (the shockwave alone enough to cause localized weather disturbances, tear through multiple reinforced concrete floors, and shatter stadium lights from several hundred meters away)what exactly could be used to shield Midoriya from that kind of recoil? Even now, he can only use One for All at 5% of its full power, and even then only by distributing that energy throughout his body.
    • Well, he just did that, although the absorbers also slightly increase his Full Cowl power. 100% One For All is still too much for his body even with them though, so he needed to change fighting styles anyway.

    Quirk Necessity 
  • Why is it that Quirks are so necessary for superherodom? It's already been shown there's technology that outright replicates Quirks - take Eraserhead's carbon-fiber tethers that he can seemingly control with his -mind- that are NOT part of his Quirk! This makes Ragdoll's forced retirement from being one of the Pussycats after the loss of her 'Radar' Quirk seems weirder to me when she could be set up with tech to make her into a Gadget Heroine and keep her with her beloved team seem even more awful. Heck, one of the students in the Tournament who was ACCEPTED TO UAA HAS A QUIRK THAT IS JUST "SEE FAR" - despite it having low combat potential and being easily replicated by tech, this student was allowed to be a hero solely on her technological merits that carried her through the entrance exam, NOT her quirk.
    • Mei is in the support course. She's training to be an inventor, not a hero, and because she didn't apply to the hero course there's absolutely no reason for her to have taken the hero entrance exams. She fought in the sports festival, yeah, but that's open to everyone – it's just that, due to the nature of the festival, the well-trained, athletic, and combat ready hero course has an extreme advantage over the rest of the school.
  • In total - why did even All Might himself say to give up being a hero without a Quirk when you very clearly CAN BE A HERO WITHOUT A QUIRK IF YOU HAVE THE RIGHT TECH?
    • First of all, Mei Hatsume is not in the hero course. She's in the support development.
    • Second, most equipment tends to be built around the Quirks themselves, so you still need the Quirk in the first place in order to use it. For example, Bakugo's Grenade Blasters that store his nitroglycerin sweat. So far, only Aizawa appears to have equipment that does not revolve around his Quirk and is sufficiently strong to overshadow a lot of other Quirks. Everything else is Quirk amplifiers or side-effect reducers.
    • Third, adding to the above, equipment can't effectively replace Quirks, because it often gets lost, stolen, broken down, etc. It probably costs a lot too, especially because that stuff is often customized. The students and teachers can get away with it because U.A. funds them.
    • Also, the only reason Badass Normal heroes are a thing in western comics is mostly due to author fiat and favoritism having to write around to keep the squishy normals from getting owned by villains with superpowers. This setting doesn't have that; trying to be a Badass Normal when there are quirks that are good at mass destruction on even freaking purse snatchers is only going to get you killed. Even Midoriya himself admitted that him wanting to be a superhero without a Quirk was mostly wishful thinking on his part after All Might told him straight out that getting into Heroics without powers was dangerous. Sure, Izuku might not need a quirk to save people, but when you're fighting against guys who can literally dis- and re-assemble people from scratch, you're going to die if you can't defend yourself.
      • Point number four doesn't really hold water. We already have examples of characters who can kick incredible amounts of ass even without using their Quirks. Take Stain, for instance. Sure, if he can lick a person's blood, they get paralyzed and are effectively helpless, but until he draws blood, he's effectively no different from Quirkless person. Nevertheless, he managed to kill or disable dozens of pro heroes and managed to hold off Iida's Super Speed, Midoriya's Super Strength and Todoroki's massive Area of Effect Elemental Powers with only training, mundane weaponry and a normal human body. He lost in the end, but only because he got impatient and even then, Midoriya believes that Stain could have still killed him had he really wanted to. The Quirks of those three students are well above average, particularly Midoriya and Todoroki's. Most Quirks don't even have a fraction of the power of One for All or Fire and Ice, like Ojiro's Tail, which just gives him a strong tail. It isn't inconceivable that a sufficiently armed Badass Normal could defeat most villains given enough effort. The real reasons there are no Quirkless heroes are probably twofold:
      • 1) The whole point of a hero license in the first place is to allow heroes to use their Quirks against other people, something that not even the police have the permission to do. A Quirkless person would receive no benefit from the license, nor would a hero academy's heavily Quirk development focused curriculum help them in any way. It would just be a waste of time when they can just become a policeman instead. The entire point of Heroes is to be a Quirk-ed counterpoint to Quirk-ed villains, so a Quirkless hero would essentially just be a vigilante.
      • 2) In the current hero business, popularity is as important, if not even more important, than actual competence. No matter how skilled, someone without a Quirk to attract attention to would have a hard time making ends meet. Even if they got popular due to the interest in a Quirkless hero, there's only so long you can keep that up before flashier Quirks steal the spotlight.
      • Even so, despite these two factors, UA recently allowed applications from Quirkless prospective students, showing that they are at least open to the idea. Let's not forget that in the original draft of the manga, Midoriya was going to stay Quirkless. A Quirkless hero might appear in time, it's just that nobody with the right amount of skill and motivation has appeared yet.
      • U.A. is not really opening applications for Quirkless students, but rather scooping for users of Heart Is an Awesome Power like Shinso. Because fighting ability is an essential metric, there's not much of a point of having a Quirkless hero when you have hundreds of seemingly useless Quirk users in line that could potentially turn out to be a big asset. It's also worth noting that Stain is a direct example of the second point, his equipment and fighting style is exactly designed to allow him to use his Quirk more efficiently as his speed, ambushes, and blades make it easier for him to have access to a victim's blood. The danger of his Quirk is really underestimated.
      • No, U.A. literally opened applications from Quirkless students. The point stands, but Izuku literally wouldn't have been allowed to apply until they stopped discriminating against Quirkless people in the application process.
    • There's also the fact that (as All Might points out when he first meets Midoriya) there are plenty of other avenues for someone with no quirk to contribute to society. In fact, All Might explicitly points out being, say, a police officer is a perfectly respectable and important job. Midoriya is explicitly asking about being a superhero, that is, someone whose job is essentially to be a first responder when dealing with disasters and supervillains, which are situations where having a Quirk would be most important. It's not that someone without a quirk is physically incapable of heroism, it's that trying to do superheroing without a superpower is extremely dangerous and it's just much more practical to focus on those who have Quirks. Heroism was literally designed to involve and use Quirks - there's no reason that Quirkless people would have an easy time in it, even with gadgets.
      • There is also the fact to consider that Eraserhead and Stain have POWER NEUTRALIZATION Quirks, and their skills are built around those powers, not in spite of. They cannot be considered a good sample to justify Badass Normal superheroes because their powers give them a specific edge against other quirk users that couldn't be replicated with a utility belt. They're actually a fairly terrible example, because bring others down to a temporary Badass Normal and then proceed to absolutely annihilate them, only proving that without Quirks people can't really survive in a heroic or villainous job.
      • Let's not forget that 'villain' isn't an arbitrary title for any ner-do-well. It's specifically meant for someone who uses their Quirk unlawfully. Hero is someone who has special permission to use their Quirk to stop unlawful use of Quirks. Quirkless people don't even need the Hero license to intervene in defense of others, provided that they're even able to make a dent.
    • Ragdoll losing her Quirk also left her with severe mental trauma. Even if her physical abilities are the same as they were before, she effectively has severe, possibly even crippling PTSD from the events surrounding the loss of her Quirk, which would make it harder for her to perform.
  • In the anime, Midoriya says that U.A. doesn't require a quirk anymore in order to take the hero entrance exam and he's still officially registered as having no quirk when he took the exam, meaning that having a Quirk isn't actually necessary to be a hero but it gives you an advantage in the exam.
    • Considering how physical the exam is, it's almost impossible to pass without a Quirk. And even if somebody did it in a fluke, they would most likely get expelled by the likes of Aizawa.
    • Also, you can get in without a quirk... in GENERAL EDUCATION program, not heroics.
    • As for why we haven't seen many tech-based, quirkless heroes, it's very likely you could make far more money just selling that tech than you could use it to beat up purse snatchers. And that doesn't require risking your life and expensive equipment on a regular basis.
    • Part of the strange lack of tech-based heroes could come down to the image. A tech hero, no matter how incredible, isn't nearly as "unique" as who uses their own special power in the eyes of the public. Given how popularity-dependent professional hero work is, it makes sense that they'd go for a flashy freak of nature than what is essentially someone using just fancy toys. The villain, Mustard was mocked for depending on his gun above his power, so it does seem that there is something of social stigma on using weapons when you do have an active Quirk. Power-enhancing equipment and restraints are used, but the main focus for anyone trying to appeal to the public is their unique Quirk.
    • On a more practical note: the use of technology in the pro hero world is limited to prevent starting a form of arms race between heroes and villains. Crimefighting tools can be lost, broken, stolen, or copied far more easily than Quirks can be matched. That said, given the increasingly dire situation in the story, I wouldn't be surprised if a tech-based hero or villain doesn't appear soon.
  • There is a Quirkless Hero shown in some of the supplementary materials, and judging by how advanced some of the gadgets in this setting can get it's possible that a Quirkless person can act on even terms with those who have Quirks... but just because it's possible doesn't mean it's plausible. The reason Quirks are considered to be such a necessity is because of how dangerous the Hero business can get. Villains frequently have Quirks of their own that make them extremely dangerous, to the point that just physical training and gadgets may not be enough. You also have to consider that things like natural disasters are also a major threat even to those who have Quirks. Not to mention that a Quirkless Hero who's reliant on gadgets has their effectiveness drastically reduced if they can't use them for some reason, whether they were just caught without it or because it was damaged or lost. Now, considering Midoriya's so skilled at analyzing and planning for another person's Quirk that you could consider that to be a Quirk of its own, he had the potential to be a Hero even without receiving One for All... but would All Might really not try to talk one of his fans out of pursuing a career path that runs a strong chance of getting him crippled or killed?

     Heroes and teachers 
  • How do professional heroes end teaching at a high school, apparently with degrees allowing them to teach Literature or Maths?
    • First of all, it should be noted that U.A isn't a normal high school, the ability to teach Heroics/responsible Quirk use is likely the priority. However that doesn't mean that the Teachers never studied to do anything else, it's very possible that all of them are qualified to teach those subjects, and if there's a gap then U.A would likely hire a normal teacher to fill in the gaps.
    • It's also possible that in series children are taught all their Literature and Math before reaching high school. Since over 80% of the population has a quirk it's possible that average school happens at an elevated speed so kids can learn quirk responsibility, and how to be a hero.
    • Having pros teach the kids even in normal classes probably serves several purposes. 1) It helps the kids familiarize themselves with the pros and get more accustomed to the outlandish world of their future careers. 2) It lets the pros impart some wisdom related to the class that normal teachers wouldn't. 3) It lets the pros monitor the students for any behavioral problems, areas personal growth, and/or external dangers. 4) It allows them to quickly respond to any students that might get out of control. That said, normal teachers, possibly with special equipment, could likely do most of the regular classes while the pro heroes stuck to doing heroics-related classes, but that would be a lot less interesting to the real-world audience. When you're reading a story about a superhero school, you want to see the kids learn from superheroes, not sit through what is essentially a normal class with a normal instructor.

    Eraserhead and blinking 
  • We see when he saves Tsuyu's life from Tomura that he only needs one eye pointed at a person to nullify their Quirk. If that's so, could he train himself to blink one eye at a time so that his Quirk would remain indefinitely activated?
    • That would require an insane level of training, coordination, and effort, which wouldn't be very practical in an actual battlefield situation.
    • I dunno, people have successfully trained themselves to do things like crack the knuckles on only one hand for their entire life.
    • Aizawa's got dry eyes anyway, which is what actually prevents his Quirk from being always in use, so this is a waste of time.
    • It would also limit his depth perception, which is probably not a good thing in a combat environment. The other thing is that he tends to focus more on neutralizing the target as quickly as possible rather than suppressing a quirk for a long period of time.
      • Even if he has his eyes open, his Quirk is only active as long deliberately activates it, which takes physical effort. His power only keeps others neutralized for the time it takes for him to need to blink again, meaning maybe a minute or so at a time. Because he knows he only has a short window to act in, he made his fighting style all about ending fights quickly and efficiently. There would be no point in training up some blinking trick because it'd offer little benefit compared to working on fundamentals like martial arts, stealth, and restraint. Besides, he already has a measure to deal with enemies knowing when he blinks: his goggles.

    Aizawa's fitness testing 
  • So Midoriya came in the last place in the class, right? While it seems obvious because he can't use his quirk very much, thinking about it a bit still raises the question: How the heck did he manage to place behind Toru Hagakure? It's true that he only got an above-average result in one test, but Toru's power (invisibility) isn't an ability that would give her any kind of boost in any of the activities that Aizawa was having them perform. As a result, you'd think that Midoriya's one above-average activity would've pushed her ahead of him, as all of her results would've been on the level of a quirkless individual. The only way that could happen is if she managed to beat him in all the other events by a wide enough margin that it nullified his massive advantage in the softball throw. But that in itself is unlikely, as Midoriya has been training super hard under All Might for months and is in really good physical shape. In light of that, how did he manage to still end up in the last place?
    • Pitching was Trial 5 out of 8. There were 3 more events after that where Midoriya underperformed due to the broken finger. So yeah, his advantage was nullified.
    • Midoriya did exceptional in one event, okay in the previous ones and poorly in the rest. For all, we know Toru managed to do average or better in the other events, and so she wasn't placed last. It's also possible that Aizawa was scoring them based on their quirks. After all, he was gauging their potential first and foremost.
    • An interesting theory would be that Hagakure scored exceptionally well during the long-distance run, as we didn't get to see the full duration or results of that test. Hagakure could simply remove her clothing and run in the opposite direction to the finish line (assuming a circular field), which would acquire her one outrageous score.
    • Midoriya had only begun serious training within the last year and was exceptionally nervous. It's possible that he let his worries get the best of him and let his performance suffer because of it.
      • He still has ten months of training under All Might and was moving freaking cars on the beach. He should have done better than a large portion of the class on physical abilities alone.
    • The rankings were based on Aizawa's own discretion. He didn't give any explanations of how they work.
    • The test was not for fitness but for Quirk comprehension. He graded them based on how they used their Quirks. Izuku did not use his at all save for the pitching test, thus he had the lowest score. For someone like Hagakure, whose Quirk does not enhance physical abilities, Aizawa probably graded them using the human baseline for their age, gender and size.
    • The entire point of the test was to cheat with your Quirk for better scores. Bakugo using his to fly across the long jump field, for instance, rather than actually jumping. Hagakure just took off her clothes and lied about how fast she did on any timed event, or starts way past the starting line, or any other way to use her Quirk to cheat. Of course, Aizawa knows she's doing it, but using your Quirk to get better scores was the entire point, so he records what she says.

    Midoriya looking down on Bakugo 
  • So, chapter 119 has Bakugo stating that Midoriya always looked down on him. Why does he think that? I never quite realized any point in which Midoriya hasn't treated Bakugo with respect, even in situations where he was undeserving of it. Is that just Bakugo's view on the relationship? What exactly triggers him so much that he believes Midoriya to be constantly looking down on him, even though they interacted very little despite Bakugo's bullying?
    • Bakugo interpreted Izuku offering to help him when he fell in that pond when they were five as Izuku looking down on him and has apparently obsessed with the idea from then on. Yes, it's that stupid.
    • It wasn't the pond scene, but rather the fact that Midoriya had managed to obtain power from nowhere, which led Bakugo to believe Midoriya was deceiving him all this time and made things worse. Before that, he just thought Midoriya was an annoyance.
    • Bakugo's own mom said he got an inflated sense of ego due to incredible raw talent and the praise from it, and as a result, devolved a complex where he views receiving help as a personal weakness and failing. Midoriya rushes to help no matter what, but Bakugo interprets Midoriya's behavior as Midoriya thinking that he is the more capable of the two and thus disrespected/looked down upon.
    • Midoriya managed to be at the center of the first events that really damaged his pride. Midoriya saved him from the Sludge Villain when Bakugo was helpless, he defeated him in the mock battle while displaying power far surpassing his own, spewed some crazy story about him somehow gaining a Quirk for someone else to rub it in, he has the attention of All Might, he earned the respect of Class 1-A while Bakugo was generally seen as just a jerk, got the respect of the one other student Bakugo saw as a rival, etc. In Bakugo's mind, this all meant that for their entire childhood, Midoriya was while hiding his own immense power and skill. The only reason he can process that Midoriya didn't challenge him before now is that Midoriya was letting Bakugo play Big Man on Campus because he didn't consider him worthy of enough respect to use his Quirk on. Remember, Bakugo filters everything through his ego, so his former victim overshadowing him is seen as the gravest insult.
    • I think it's important to note that when Midoriya tries to help Bakugo, he (unintentionally) points out Bakugo's weakness(es). When Bakugo falls into the pond, it is Bakugo "failing", albeit in a minor way. When Midoriya comes down to help him out, he is pointing this "failure" out. Basically, Midoriya helping Bakugo is showcasing that Bakugo isn't perfect and Bakugo thinks that is Midoriya's true motivation for trying to help him.

     Could Mirio really have been the top hero? 
  • This troper acknowledges that Mirio's permeability quirk is very useful and he's certainly gone through a lot of training to work out all the bugs with his quirk (and he had some very big bugs to work out), but overall, this troper questions his ability to actually take on other villains without some kind of offensive power. He could train himself into a hard-hitting master, but the hardest hitting punch on record measured in at around 950 foot pounds: the same kind of impact a magnum round has, but in the MHA universe, that's still rather weak considering some people have hardening quirks, can actually take hits like that easily, and shock-absorbing armor exists. Worse still, his quirk means he can't carry weapons or armor or any kind, and he'll have to become tangible at some point to do any damage, since it's specifically stated that if he re-materializes in solid matter, he's violently ejected, so no internal organ damage. Not to mention area attacks, like electricity, sticky mines, earthshaking audio blasts, or tape (all of which class 1-A can produce). Since he's deaf and blind while permeable, it would be child's play to scatter or conjure said obstacles around and wait for him to re-materialize—right into whatever trap had been laid for him. I'm not saying he can't be a powerful hero, but perhaps "top hero" is a bit of a stretch.
    • Mirio himself stated that he has developed counters for his counters. He also didn't have a hard time taking down Kirishima, who has a hardening Quirk. He's fast enough to just knock out any guy that takes over half a second to activate their Quirk, so the whole area obstacles thing only works if the dude is Crazy-Prepared enough to know he's facing Mirio.
    • Mirio took down the entirety of Class 1-A in a matter of seconds in one of his first appearances. His Quirk is somewhat one-note, but he honed his body and skill with it to the point that even its disadvantages are helpful in setting up devastating attacks. Sure, he's never going to flatten buildings with his bare fists, but he's at least near peak human strength and durability by in-universe standards (i.e. highly superhuman in the real world). Beyond that, he has the charisma and morality to shine as a beacon to others that is so rare as to almost instantly elevate him in the public eye. With all that combined, he could easily have become a top-tier pro after graduation as he was. If things had gone as planned, All Might would have ended up passing One For All onto him instead of Midoriya, which would make him almost certain to take the Number 1 rank as soon as possible.

     Unknown Class 1-A Student. 
In the first panel, top right on this page [1] there is a guy with no head. He's appeared a couple of times before and after this, but I cannot, for the life of me, remember anything about him. He doesn't even have a character page here or on the wiki. Who is he?!
  • In the original Japanese text the words would end up blocking the student's head from view and after English translation condensed the space it would take up, it reveals the area but they didn't edit in someones head to fill in the missing space.
    • That actually seems most likely. Just wish I could find the raws to check.
      • It is, the head is blocked by a vertical "バカか"

    Is Tsuyu one of the main characters? 
  • I mean, she always gets heavily promoted, always on the top 10 of popularity pools, the colored spread made by Horikoshi included only the 5 main characters plus her, she always appears to be somewhat related to the current Story Arc, when Class 1-A fights, she always gets at least one moment on the spotlight to fight. Is she considered one of the main characters now?
    • Tsu is a secondary character in the same way Kirishima is; they're kept in spotlight due to their proximity to actual main characters. In Kirishima's case, it's usually Bakugo, for Tsu it's Uraraka.
    • Tsuyu's biggest role so far is still the USJ arc. Outside of that, she hardly had screentime comparable to the main character.
    • Tsuyu and Kirishima have had the most exposure and focus of anyone outside the main five students of 1-A, but they're still secondary characters despite it all. They have gotten more attention in more recent chapters, but they have a long way to go before either one is considered comparable to the likes of Iida and Uraraka, let alone Todoroki, Bakugo, and Midoriya. That's not to say that they can't ascend later on, but that's looking unlikely.

  • Considering that 20% of the human populace is supposed to be Quirkless it’s strange that Midoriya is treated as being that unique. In the hero business, it would strange and worrisome, but he’s already being bullied and treated as traumatically handicapped as if nobody knows of other Quirkless people from the age of four. With a 20% chance of being Quirkless, there should be dozens of them walking around and every class should have a couple of them (every non-hero class).
    • The story is about how a boy wants to become a hero even though he’s originally not suited for it. The author wants to make the protagonist look more extraordinary by drawing attention to how in a world with superpowers he’s born without any. Granted, even then it’s strange that he’d say that 20% of humanity is still Quirkless rather than 1% or something to increase the rarity and more solidly justify Midoriya’s position.
    • Being unique in the hero business makes sense. The strange part is that he would be unique in kindergarten, primary school, AND middle school, and mistreated for it to boot. Midoriya is basically the Token Quirkless, a position which is later inherited in the opposite direction by All Might. Somewhat.
    • It could be age-related. Since the number of people with Quirks increases in each generation, and the percentage given encompasses ALL human populace, it's possible that most Quirkless people are older, while for Izuku's generation the percentage is different.
      • Adding to this, worth remembering that Japan has a disproportionately large amount of old people, so yes, the majority of the 20% are likely them.
    • It's age-related. The 20% is world-wide and coalesced mostly into the older population by the time of canon. All Might, when revealing he too was quirkless, says something along the lines of "Being quirkless wasn't nearly as rare in my generation as yours."

     Japan the Center of the world 
  • Why are the majority (if not all) of the world's top heroes Japanese?
If 80% of the world's population got quirks, how come that it is Japan that seemingly gets the highest global recognition in terms of hero business? (the majority of the heroes, the most famous hero academy, etc...) What about the rest of the world? Are there "top-10 heroes" per country or just a massive global Top-10 all in all? (I get that All Might is the acknowledged global symbol of peace, but how does that work in other countries? He can't be working beyond the borders of Japan, right? So does the other continents have their equivalent of him there as well? Confused.)And in that case, how come it is Japan that gets seems to be the most skilled in handling the quirks? (Since the Top 10 heroes appear to be all Japanese...)Can anyone possibly help out explaining this? (This is more of a "universe" headscratcher than a story one since I know the story follows Izuku for a reason. I'm just curious and puzzled over how the world handles the quirks on a global scale, that's all.)

  • This troper thinks that it's probably due to a lot of things. If we take into account some of the things that have been said in the story: such as the emergence of quirks causing such unrest as to stagnate or even regress society, to the point that if it hadn't happened the world of MHA would be a Gundam world (and that this statement is noted by Izuku to have been said some time ago to boot) and the fact that All for One is, due to a quirk he stole, the oldest living human by far - having seen 9 Generations of One for All users come and go - we can safely say that an enormous amount of time has passed since that baby in China with the first quirk was born. IF we assume that, that child's birth was somewhere between 2020 and 2050; then taking account of the Space travel comments, and factoring All for One's supposed age and the time for 9 generations of One for All to come and go - if we assume a generation is about 20 years then AFO is in his 180's at the least - I would suspect that at least ~200 to 250 years have passed since then, meaning that Izuku and his friends are living somewhere between the years 2220 and 2300. It may not seem like it but that's a significant number of years. In an equivalent period of time, the United States went from a backwater colony to the world's preeminent Superpower. In the same time frame, the British, Spanish and French Empires rose and fell, and two World Wars, the Cold War and the Nuclear Bomb reshaped the World and its balance of power. Considering the suggested upheaval that occurred when quirks first emerged, and the probable centuries that have passed, it's possible that Nations like America, Great Britain, Russia and much of the like no longer exist or at least not as we know them. Lastly one has to remember that until the near past when the last few users of One for All beat him back All for One basically ruled Japan. It's possible that Heroes migrated there to combat his influence even without knowing he was the exact cause. I also don't remember if it's even addressed if Japan is still Japan, as a nation-state anyway - at least currently. There could be some sort of greater world government that administers the whole planet- at least by Deku's time - perhaps after All for One was beat back into the Shadows, Japan was absorbed into the global Super UN or whatnot.
  • It's also a reference to the fact that New York is the center of the world in Marvel Comics.
  • The rank is confirmed to be Japan-only in the manga. The U.S. is mentioned to have its own heroes as well as a global headquarters (probably something like the Justice League), which implies a separate system.
  • We are only dealing with Japan in this story because that's where the creator and main audience lives. We know very little about any other nation in the setting. For all we know, there could be hundreds of Number 2 heroes the world over and All Might is just so amazing that he's recognized worldwide. There is no indication that any of the other top-ranked heroes in Japan are well known outside the borders. That may indicate that All Might isn't simply Number 1 in Japanese rankings, but he effectively broke the scale to become a world phenomenon. No wonder Endeavor gave up in chasing his spot: it isn't just moving up a ranking. It's transcending the ranking system itself.

     Worst in class on the first day 
Okay, during the first class, the students do a big physical fitness test. Since Midoriya's got no control over his powers, he comes in dead last. However, should that really be the case? Even if he could only use his quirk on a single part of the test, he's still coming off a year-length intensive training regiment. Meanwhile, a majority of other students have quirks that don't seem especially useful for the tests either. The invisible girl is the most obvious, but you've also got the guy who can replicate body parts, the girl with the sound powers, the guy with the sticky hair (who has miniature legs to boot), the guy with the duct tape in his elbows, the girl with acid powers and the guy who talks to animals.

  • Midoriya said he severely underperformed during the last three tests because of his broken finger. Besides, Mineta was shown using his quirk for one of the tests with ludicrous results and it is not that much of a stretch to think Sero used his tape to help in some tests, Spider-man style.
    • Except the last three tests are Sit-Ups (doesn't involve fingers), Seated toe-touch (doesn't require 10 fingers), and a long-distance run (also doesn't involve fingers), although in the last one invisible girl and grape boy are shown outrunning him... somehow. Either way, it doesn't make any sense.
      • Having a finger with multiple bone fractures and third-degree burns is bound to be quite distracting.
  • As noted above it was not a fitness test but a test for quirk usage. Midoriya only used his in one event and showed that he has only the barest control over it, netting him the lowest score.

    Midoriya vs. Todoroki: Cavalry Match 
Why didn't Midoriya attempt to grab all the point headbands around Todoroki's neck when he had the chance to do so? There's really no justifiable reason as to why he couldn't.
  • He just didn't expect Todoroki to shuffle the headbands as that's a rather trivial move, otherwise his logic of the top band being his was solid, albeit not optimal because Todoroki was clever enough to come to the same logic.
    • Also, you have to take account of Midoriya's personality. He wants to win, sure, but he wouldn't want Todoroki's team to be eliminated because he took all of their headbands when the One Million would have been enough.

    One For All vs. All For One: Just how? 
Okay, One For All is an amazing Quirk, simple but its power is just ridiculous, but All For One has centuries of experience plus ALL THE QUIRKS AND THEN SOME, How is All Might able to keep up with him, much less overpower him? It's even implied by Gran Torino that the first time that All Might and All For One fought, it was a clean win to All Might, All For One only escaped because he played with All Might's emotions by mentioning his mentor's name, which gave him the opening to get a clean hit(which is what took most of All Might's organs) and escape, which means not only One For All overpowers All For One, it does so by a notable margin.

And if One For All is that ridiculously powerful, why did All For One give that Quirk to his brother of all things? even if his intention was pure and he just wanted to help his brother, he could have given anything to achieve the same effect, yet it seems he gave away the holy grail of all Enhancement-type Quirks.

I get it as a narrative contrivance, that One For All HAS to be able to keep up with All For One for the story to work, but how equal they are in power just doesn't feel it adds up from a logical standpoint.

  • Let me try and answer as best I can:
    • 1: All for One's Quirk allows him to steal and GRANT any Quirk he wants. Any Quirks he keeps are simple that doesn't require much training to use. The Quirks he had when he fought All Might the first time were likely things such as super strength, shock absorption, and speed. The first Nomu had those or similar Quirks, and All Might managed to beat him even though he was weakened. Plus, because of how powerful he was, All for One likely got cocky and rusty over the years. Remember he was ruling Japan from the shadows, so he probably has the same amount of combat experience as to, say, a sidekick working for a Pro Agency. He just makes up for that lack of experience with his many Quirks.
    • 2 Another likely reason is that All For One mostly has quirks geared towards augmenting physical strength, which is All Might's specialty. Had All For One used a different set of Quirks, he might have been able to easily defeat All Might.
    • 3: When All for One gave that stockpiling, Quirk to his brother, the brother only had the strength of two grown men at least. And remember, no one, not even the first user of One for All, knew he had a Quirk that could be passed on to others. One for All builds up power as it's passed along, adding the strength of the previous users to the next. Remember, All Might once changed the FREAKING WEATHER with one of his smashes once.
    • 4: Gran Torino trained All Might when he was just starting. And judging by All Might's reaction when he recalls the training, it must've been harsh. Plus All Might has been a Pro for a few decades, meaning he's fought all kinds of villains with varied Quirks. Take the above points, and it's not that hard to imagine how All Might managed to beat All for One.
    • It's been stated by several people that All Might hasn't just got a powerful Quirk, he mastered it with ease, far greater ease than Midoriya. Nana also had One For All, and it didn't seem to help her. Simply put, All Might is just that good.

  • We do have to account for plot contrivance, but there are so many things going on here that we can only guess at.
    • First off is AFO's actual level of power - it's completely unknown - we know that All Might beat him twice so theoretically 100% All Might > ?% All For One (Person), we have no way to confirm that AFO was at 100% - did not have any other injuries or issues - when he fought All Might, though we can assume it.
    • We also don't have much exposition on All For One (The Quirk) either. We know it can steal, store and bequeath other quirks, but the requirements, if any, for that to happen is not exactly known, nor is it known if there is a limit to how many quirks the user can steal or use at one time. It might be similar to Pokemon with its 4 move limit, AFO may only be able to use a limited number of quirks and might have to rid himself of one to acquire another one if he is at his limit. Or it could be like items in an RPG, you can have a near unlimited inventory but you only have a limited number of "slots" you "equip" at a time. We can also assume that the voluntary giving lock on OFA prevents AFO from taking it - seeing how he hasn't stolen it back from any of the users that have faced him.
    • One last thing to consider is AFO's motivations, All Might the 8th User of OFA is the first user - that we know of - to actually defeat him. I can possibly see him sparing his brother - and it's possible that when he killed Nana, that was his intention, not knowing OFA had already been passed to Toshinori/All Might - but why has he "allowed" One For All to continue to exist and to hop around getting progressively stronger? We could chalk it up to arrogance, perhaps he thought it would never become a threat - though that level of myopic overconfidence seems out of character for the intelligent and constantly scheming AFO - but surely by the 4th or 5th user he would have realized that allowing OFA to keep moving to new hosts, increasing its power as it went would be detrimental to his plans. I suppose that like with the previously Nana situation, each time he tried to kill the host it was too late and the quirk had already been passed on - though that would be rather contrived on its own - it's also possible that Nana or All Might were the first users since his brother to actually encounter and fight him - in which case his ability to gauge how powerful the quirk was growing might have been hindered. It's also possible that OFA fits into some master plan of his, when knowing he's infamous for his scheming and he's already pulled a Xanatos Gambit with his defeat and his preemptive grooming of Tomura as his successor - one that he expects to fully eclipse himself - it's possible that he needs OFA around for some unknown endgame. We just know so little of him, his ultimate goals and plans that everything is mostly just mad guessing and speculation.
    • Remember, despite his power, All For One is more of a crime boss than a fighter. His specialty is manipulating events from the shadows rather than personally crushing all who oppose him. When he does fight, he has to juggle his selection of powers, constantly trying to decide which might be useful at the moment. Even for a genius, that takes time and focus. All Might has power as basic as it gets and is a workaholic who can't bring himself to ignore any situation where people are in danger. He's in constant practice to hone his skills. All For One is likely more powerful than All Might, but he isn't in action nearly as often meaning that someone close to his strength level could win if he had enough skill/determination.
    • We also have to remember that All for One is big on symbolic victories. He doesn't want to just kill his opponents. He wants to destroy all that they stand for and force them to watch. He's willing to invest decades into corrupting the grandson of one of his greatest enemies just so he could rub it in the face of someone he hated even more. All for One probably had enough raw power to kill All Might in both of their fights, but merely killing him wasn't the goal either time. Not when he could make him suffer more. He lost twice because both times he underestimated just how clever, powerful, and determined All Might had become.
    • As for how the users of One for All kept it circulating for over a century, there are ways. When the power was first made, it was, at best, a mediocre strength boost. It likely took a few passes before it amassed enough power to be worth All for One's attention. It's not like he'd have any way of knowing how many iterations the One for All had taken unless a wielder explicitly told him. We also know that it is possible that it could be given to people with Quirks and enhance them, meaning that the lighting-aura strength booster we see isn't the form it'd always take. This would make it very hard to locate over time since it'd be next to impossible to tell who the current wielder was. Even if they were found out, a wielder could pass it along to the next one and throw AoF off the scent. We're talking about All for One having to play "Needle in a Haystack" all over the world with a needle that constantly changes size and shape. Even with his resources, he'd have to be ridiculously lucky to track down the current vessel of One for All before they passed it on out of his reach. All this combined would allow the accidental Quirk to continue to grow until it not only threatened All for One but maybe even surpassed him.

    Quirks mimicking human technology 
How is it possible for Quirks, a naturally-occurring phenomenon, to mimic the appearance and functionality of human-made inventions like jet engines, earphone jacks, and cellophane tape? If people had made earphone jacks look different, would Kyouka's Quirk have looked like that instead?
  • It could be that the Quirks started off as a Imagination-Based Superpower and formed from what the user wanted them to be before setting in as that power for that quirk, (For example, the very first documented quirk in the series was an infant who radiated light from its body, hinting that it might have been scared of the dark and the quirk was formed in accordance to its wishes, a light, to feel safe again.) The first generation quirks might have been formed by their users' minds, and then at the second generation, passed over unchanged with the lack of quirk users at that time, but at the time of the third generation, their numbers grew for possibility of mix-quirks, and as the number of quirks increased, the diversity of them became heritage from parent to child, with the possibility of mixing them, so at the fourth generation, the number of Quirkless people started to drop, in consequence of quirk users seeking out other quirk-users as partners instead. Why do they look like earphones, engines, tape and the like? Because the originator of those and other similar quirks, wanted those powers when the quirks were formed, and then it stuck, carrying over to their descendants. Just a theory of course...
  • One thing to add is the fact that it's now known that quirks were created by some type of bizarre virus that went circling around the globe, significantly mutating the DNA of everything that caught it. Allowing for suspension of disbelief and acknowledging "Fantasy Science", due to how out there an impossible many quirks are - and acknowledging that "Fantasy Science" of this level could just lead to both the virus and the weird quirks developing ex nihilo - it's always been my suspicion that quirks and thus the virus were not natural events but something that someone, perhaps your stereotypical mad-scientist with a god-complex, created and then introduced into the world. If that man-made theory is correct, then it might explain some of the weird quirk manifestations. It also could be a simple rule of cool.

    Taking the Bullet 
Putting aside keeping Eri from getting physically hurt, why did Mirio take the Quirk-destroying bullet for her? He knows that it's her Quirk that does the destroying, and if her own Quirk is destroyed, that would nip this entire problem in the bud, no? That way, he could've kept his own Quirk, and the Quirk-destroying bullets would be gone for good- no more could be made, even if the heroes fail to recover her this time. Of course, as a hero, he wanted to protect her from any further harm, but... Well, I'm proud of him nonetheless.
  • Well, that was completely self-answering.
    • Also, he had no way of knowing if it was loaded with real bullets or not. (WE know that but HE didn't know that.)
      • I think Mirio was very aware that they were quirk-erasing bullets, and therefore knew that he would lose his quirk if he got hit by them. That said, a special injection bullet is still a bullet when shot, and Nemoto was clearly aiming with the intent to kill Eri in order to lure Mirio. You can see the bullet pierce his costume's armor, which has likely been reinforced in some manner just in case he can't use his quirk (because it's stupid to not think of contingencies when quirks like Aizawa's exist), so if it had hit Eri in the head or even anywhere else on her body, it likely would have killed or mortally wounded her. Which, yes, would have also potentially solved the problem of her quirk being exploited, but considering the heroes were supposed to be rescuing her, I wouldn't really consider that a successful mission if that had happened.

     Tokoyami's Head 
What's the deal with Tokoyami having a bird head? His quirk Dark Shadow doesn't seem to have anything to do with him having it and all the other characters with animal characteristics Tsuyu, Selkie, Centipeder, etc have them because of their quirks, so what's with Tokoyami?
  • Bakugo, Kirishima, and Kaminari have unnatural eye colors and Kirishima has a mouth full of fangs, all details that seem unrelated to their quirks. It's possible that humans in this universe have more phenotype variance than the real world (possibly as a side effect of the Quirk Phenomenon?) outside of their quirks and Tokoyami is an extreme example.
  • It's been shown that Quirks can and do mix over generations and that several of them are more like deformities than fantastic powers. It's likely that people like Tokoyami and Koda have vestigial remnants of what were once more useful Quirks at some point in their ancestry. Since they provide no real function thanks to being so heavily diluted over the generations, they're not called to anyone's attention compared to their actual powers.
    • As said by the above tropers, it's about genetics. Even if Tokoyami's quirk is Dark Shadow, he probably has in his ancestors someone with a mutant quirk that made him a crow. The power passed to Tokoyami, was that of the living shadow but his genes still hold the mutation.
      • Same goes for Midoriya who, despite being quirkless has an unnatural hair color he inherited from his mother. On an ever farther extent, you could assume that the average human in the MHA world is way stronger and durable than the average human in our world because a lot of them are descendant of freaky power wielders.

     Just what is exactly the purpose of All For One? 
Okay, so despite being the main villain in the series, we know very little about All For One. Why did he establish a criminal empire in the first place? When All Might asks him, All For One simply replied that he felt like it, which actually sounds lame (given the extent of his crimes). So let's try to reason out his motives.
  • When All For One was born, society was in complete anarchy due to the arrival of Quirks. So maybe All For One decided to exploit this for his own benefit after discovering his Quirk. Just like how businessmen take advantage of the situations to start new businesses. In the process of "trading" Quirks, All For One could have gathered followers and built a criminal empire.
  • It is highly probable that the society at that time discriminated Quirk users as freaks and criminals. So All For One must have considered it and decided to start a criminal empire. That may explain why he seems to care for his comrades.
    • It's also possible that Quirks might have been seen as something of disease at the time. All For One could easily develop a following by offering a "cure" for the condition as well as offering power to fight back against those who abused their new abilities. The situation was very chaotic so someone with the ability to manipulate the very cause of the strife would just need a little cleverness and a lot of charisma to build themselves up into a figure of incredible power behind the scenes.
  • Maybe All For One just became arrogant after discovering the true extent of his powers, just like Bakugo. Like Bakugo, he might have wanted to be the most powerful man. That can explain why he wanted to kidnap Bakugo.
    • Except it was Shigraki's plan not All For One's.
  • Perhaps All For One just despises society, thinking it to be a bunch of crap invented by humans with no real power. He probably doesn't believe in morality, thinking that it's just a stupid invention of the society to equate the strong and the weak. He thinks in terms of power and not good or evil.
  • All For One must be just an Opportunistic Bastard with a clear lack of integrity, who is fixated on absolute power at all costs, whatever that may be. That may explain his Blue and Orange Morality. It also makes sense why his villain name is All For One. His Quirk also suits his nature. That also explains why he tells All Might he didn't have much of a motivation for what he did and his disdain for morality, believing it to be ineffective bullshit.

    Is the hero course hard locked to a specific number 
I've gotten conflicting answers on this, but is having two classes in the hero courses, 1-A and 1-B, the rule? Transferring in and out based on grades is one thing sure, but if, say, Shinsho had gotten through the exams would he had bumped a 1-A/1-B member out, or would there be 41 students?If there was an unusually large crop of good students in a year, say, sixty students, would there be a Class 1-C?
  • UA seems to have a very small staff of some of the top pro heroes. It's likely that part of why they are so extremely selective about students is because they don't have enough pros on hand to provide the attention larger numbers would need to properly succeed. That might change soon since All Might's retirement lead to a massive increase in crime, necessitating more skilled heroes be produced.

    Monoma and All for One 
What would happen if Monoma copied All for One's quirk and stole a quirk with it before his time ran out? Would he keep the stolen quirk, or would it fade with the copied All for One? Also what if he stole All for One with Copy All for One?
  • I doubt it's possible. Monoma's power is essentially a vastly inferior version of All for One that can only temporarily use one power for about five minutes. If it even is possible for him to copy the real thing, he'd likely have no way to properly use it since he couldn't handle what he took and lose it in minutes.
  • Chapters 216 and 217 reveal that certain quirks (such as One For All, Fat Gum's quirk, or Eri's quirk) result in a "blank" and can't be copied. I'd imagine that All For One would produce the same results.

    Stopping Dark Shadow's rampage 
  • If Tokoyami stays in the dark for too long, his Quirk goes out of control and starts rampaging against his will. Why doesn't his equipment take this weakness into account? Just giving him a flashlight could have helped prevent the situation during the training camp invasion. Considering how he used his Quirk in broad daylight during the Sports Festival, this light wouldn't weaken Dark Shadow to the point of making it useless, but it should be enough to keep it under control.
    • It is possible he didn't want to reveal his weakness, as at this point only heroes know how it works. Making it part of his uniform and strategy means that it is pretty obvious how his power works, letting Villains use it against him. It was implied by the training thing that he can learn to control it better, so once he becomes a full-hero he shouldn't need light at all.

    Snipe vs. Hagakure and Shoji 
  • During the final exams, Hagakure and Shoji are pitted against Snipe. His fighting style involves shooting people with his gun. The gun was clearly loaded with real, high-powered bullets judging by how he can destroy a large stone pillar by shooting it. Did no member of the U.A. staff think of why it might be a bad idea to have kids get shot at like that? A-Team Firing was thankfully in effect for the fight, but if a single bullet had hit its mark, someone could have ended up with an injury that even Recovery Girl can't heal, and that's if they weren't outright killed instantly (I repeat, these bullets are strong enough to destroy a large stone pillar). Sure, Snipe might have been intentionally aiming off-target, but one slight mistake by him or the students and we'd have a case of I Just Shot Marvin in the Face.
    • It wasn't A-Team Firing, it was Improbable Aiming Skills. Controlling his bullets is his power, so it isn't any more risky to use than it is for All Might to punch the students (given that said punches can level buildings if he is being a fraction of serious). He seems to go for non-lethal shots even against serious threats (or a bunch of plot would have been resolved when Tomura's head exploded). It was still a weird choice (given that he kinda has to hold back), but it really wasn't any riskier than anything else that was going on.
    • Snipe seems like a poor choice for any sort of test, but so is All Might. Granted, it's easier to pull punches than make bullet wounds non-lethal, but it doesn't change the fact that instructors other than Snipe are putting the students at high risk of death without extreme skill on their parts. Being a pro-hero would place the students in a variety of dangerous situations, many of which would include opponents with guns. UA is staffed by firm believers in hardcore training, so pitting students against at least somewhat controlled versions of those dangers would make some sense. That said, those two were probably just pitted against Snipe since all three characters are pretty minor and the writer couldn't think of anyone more specifically suited to their abilities.

    How did they pass the Practical Admission Test 
  • A lot of the students' abilities raise a few questions about how they passed the practical admission test. Izuku and Uraraka seem to be the only one who scored primarily in heroics, so everyone else must've got most of their scores in killing/disabling/trapping robots. One wonders how a naked girl - invisible though she may be, destroys a robot? Did the robots have any weaknesses? An off switch? How did Jiro take out enough robots to pass the exam? Did Ojiro just kung fu the robots to oblivion with his regular human strength? Could anyone just punch the robots apart?
    • According to the author, the test robots have shut-down switches that can be used if you can sneak around them. That explains why it's possible for students with non-destructive Quirks to pass. That said, the test still heavily favors flashy, physical power sets and disregards useful non-combat Quirks as Aizawa said.
      • Kind of make mind reading boy looks like a chump given Aizawa's and invisible girl's Quirks are just as useless as his in this instance but they still manage to pass.
    • Also, while Izuku noted that the cut off last year was fifty-two points the examiners may have changed it without informing the examinees. It could have been lowered. Plus they only announced the top ten scores so for all we know they could have passed by accumulating rescue points like Izuku.
    • Ojiro very likely did "just kung fu the robots", and his strength exceeds the human norm. Especially when you account for his tail which is extremely thick and muscular. And Jiro's earlobes can stretch up to 6 meters and are strong enough to punch holes in concrete. She could very likely forcibly plug them into the robots and disable them via sound vibrations.
    • Like most shonen anime, series presents a world where heroes are generally much stronger and more durable than normal people just with a bit of training. We can assume that it is possible for someone sufficiently trained to smash the training bots even without a destructive Quirk. It's not likely they expect many of the prospective students to already be at this level, but they do note the ones who are. The shutdown switches exist to test other abilities besides pure strength or destructive Quirk power like speed, agility, stealth, and observation that would be useful for an applicant. It still is overly catered to sheer destructive power, but other abilities aren't completely ignored.

    What does U.A. stand for? 
  • Seriously, what's the acronym for?
    • It's probably not an acronym, just the word "hero"(ei(A).yuu(U)) spelled backward.
      • But in-universe the name is written "U.A." and not "Yuuei"/"雄英". That would imply it really is initials and not just a pun. Even if the pun in the initials was deliberate.
      • Ultra Academics? Maybe?

    How do Bakugo's Gauntlets work? 
  • In the Hero Vs Villain battle, Bakugo reveals his gauntlets store his excess hand sweat (Which is Nitroglycerin) in the "lever" part of his grenade-shaped gauntlets, which he can then shoots out. How does the Nitroglycerin in his gauntlets not detonate whenever he makes any sudden movements? Nitroglycerin's instability is why Nobel invented TNT in the first place.
    • It's a nitroglycerin-like substance, but it isn't exactly nitroglycerin. If it were, he would die just by sweating the substance.
    • Given that Bakugo seems to have complete control of when his sweat explodes, it seems that he's got some additional power to detonate it and it remains stable at normal times. We see a firing pin on the gauntlets and his grenades that must be pulled for a blast, so we can assume that this pin unlocks its own ignition system to cause the stable liquid explosive to react without his direct action.

    Mineta staying in UA 
Aizawa is noted to be a strict teacher who has expelled several students with the Class 1-A of the previous year being totally expelled. Mineta is an open pervert and invades his female classmates' privacy, opening trying to peep at them while they're undress, which is technically a crime. Shouldn't he have been expelled for sexual harassment if Aizawa is so strict and willing to expel students?
  • In his own words, Aizawa expels students he deems to have zero potential. Mineta's potential to be a pro hero is apparently somewhere above zero in Aizawa's assessment. And we already have Midnight as an indicator that being a pervert is not disqualifying to be a pro hero and even a UA teacher.
  • Mineta's kept in part due to his Quirk's utility, but more because of his intelligence. When he buckles down, he's shown to use his underwhelming power to surprising effect and be highly crafty. Mineta's perversion and cowardice are problems, but he has shown that he can keep control of himself and isn't crazy enough to push his perversions into dangerous territory. Aizawa is clearly forgiving of character flaws when it comes to people he considers to have potential, so he's probably hoping that Mineta will gradually mature enough to be a decent hero on his own.
    • If anything, Mineta's one of the less problematic students in a class. We have Midoriya breaking any rule if it meant living up to his standards of heroism, Bakugo barely keeping himself from blowing up when someone looks at him funny, Todoroki making glaciers when rattled, and the others all having their own renegade moments. That's not even getting into the villains. If things were more peaceful, Mineta would probably be getting more attention. As of now, his creeper behavior barely registers in comparison.

    Why did the Pussycats drop so far in the hero rankings? 
I get that one of them was depowered, but one would think this wouldn't be public knowledge since the heroes and the Japanese government would hardly want to advertise the whole "All For One can steal quirks" thing. And 32nd to 411th is a pretty ridiculously huge drop. Plus, the very same chapter where the new rankings came out refers to how heroes who participated in the Kamino Incident all had their approval go up. So what about Tiger, who was right there alongside Best Jeanist and Mt. Lady when All For One attacked? And for that matter, why are the Pussycats ranked as a team when other heroes who are members of a hero team get individual ranks. Edgeshot (4th), Kamui Woods (7th) and Mt. Lady (23rd) are a team by the time latest rankings came out, for example.
  • Losing Ragdoll was probably a crippling blow to the team. Not only are they a hero down, but they lost a Quirk that would let them scan wide areas for life forms and powers. They'd be shorthanded, hit with a devastating blow to morale, and rendered essentially blind without her. It only makes sense that they entered a big slump.
  • They may have taken a long sabbatical in the aftermath of events. Both to help Ragdoll recover, and to reconsider what they're going to do going forward.

    Quirk Categories Too Broad 
Currently, all Quirks are sorted into one of three categories: Emitter, Transformation, and Mutant. Mutant and Transformation are broad but acceptable enough as they concrete definitions of permanent body modifications that are either permanent or can be activated at will, respectively. Emitter, however, is the one that poses the big problem since its only definition is "does not physically alter the body". This makes is so all-encompassing that it tells you basically nothing about the Quirks in the category. Why isn't it broken down into at least three or more other categories that would better reflect the powers with? Like, say, Emitter is for Quirks that, well, emit a substance or effect; Manipulation for Quirks that manipulate the environment or others; and Enhancer for effects on the users' body like super-speed or what have you. That's just a few off the top of my head on just Emitter, but it presents a much more useful description. So why is it left this way?

     Tsuburaba's Air Prisons 
Just how does he make cubes of solid air? (Beside the obvious "blow square breaths".)

     Shigaraki inheriting All for One 
It's hinted a few times that one day, Shigaraki will inherit All for One. If he does, how would he even be able to use it? We've seen with the first One for All user that All for One can steal and transfer Quirks by placing his hand on people(or at least their head). If Shigaraki gets this Quirk himself one day, how would he steal or transfer Quirks when his initial Quirk, Decay, destroys the very people he is stealing from/transferring to? He probably won't care that his enemies end up dying, but what about his allies and the Nomu?
  • Simple. Step 1: All For One takes away Shigaraki's "Decay" with All For One. Step 2: He gives Shigaraki All for One(But keeps "Decay" for himself as a secret trump card just in case, alongside with possibly one more.) Step 3: Shigaraki now has All for One and can use it safely, while Former All For One (FAFO) keeps a lethal quirk as a hidden gun just in case while being allowed to watch hero society despair a bit more at the rise of the second generation All For One. Done.
  • Decay only activates when all 5 fingers are touching the target. Shigaraki simply needs to keep one of his fingers in the air like he already does.

    Quirk Law 
How on earth did a law get passed that punished unlicensed Quirk use to cause injury regardless of circumstances? Yes, in general, it's perfectly sensible, it's no different from normal assault laws. But to prevent people from using their Quirks in justified self-defense (which also extends to the defense of others) is not only stupid, I'm pretty sure it's a violation of basic human rights. When the police chief countered Todoroki's question about whether he should've just let Native die with "so it's okay to break the law if it works out for you", Todoroki really should've shot back, "If you dare punish me for defending the lives of myself and others, I'll hire the best damn human rights attorney money can buy." Japan should be getting raked over the coals by the international community for trying to discourage its citizens from protecting their own lives.
  • Because Todoroki's quirk is one of those dangerous ones the law was meant to stop in the open. Consider that if his aim had been off even by a little, Native could have been either been frozen to death or burnt to a crisp by the flames or ice, not to mention impaled by the ice if not the cold took him first. Besides, quirks are equal to guns in this setting, and just because you got a gun, it doesn't mean you can use it to shoot someone with it, even if it is to save their lives. On the other hand, had Todoroki tried to save the others without using his quirk, relying solely on hand to hand combat for self-defense, the law would have been much more lenient, as it would fall under the "quirkless clause" which would make it solely a case of civil courage and not a violation of a dangerous quirk in accordance with the law. Besides, VIGILANTES shows that using a quirk as a civilian is okay in self-defense, as long the offending party egged the defender on into using it, however, this is only in case of saving one's own life from a dangerous situation, not anyone else. So there are flaws in the law, but still, reasonable considering the circumstances.

    Orphans and Foster care 
For such a varied cast of characters in the show and Manga, we have next to nothing to work with concerning things like the foster system of the MHA universe. We also have no characters who are able to show what it's actually like to be an orphan in the show/manga. This leaves a lot of questions concerning it. What's it like to be an orphan in a society where almost everyone in the world has some kind of power? Do the people running the system treat the kids well? What kinds of rules and regulations are put on the caretakers and the kids themselves? Do they make sense given the kids' situations? Are the kids treated well by the rest of society? Or are they socially isolated like Izuku and Shinso? Basically, all questions that fall under "What's it like?"

    Ochako's Arena Strategy 
In the tournament, Ochako's plan to beat Bakugo is to float him out of the arena with her quirk, so why does nobody acknowledge Bakugo's flight abilities that would obviously negate her entire strategy?
  • Nobody knew her strategy until the fight started. She refused to tell anyone. When it became obvious that she couldn’t even get close enough to touch Bakugo, she adjusts her plans and levitates the rubble he broke off with his blasts for one big attack. That also failed miserably, but that was kind of the point. The battle was written to show that Ochako has the resolve to be a hero, but has a lot of growing to do before she can stand with her peers, let alone pros. It was basically her first real attempt to act as an independent hero instead of clinging on to Deku or others, so of course, it would be deeply flawed. She starts working on correcting her flaws in the next arc having found inspiration to start working seriously.

I'm a little confused about the timeline, specifically the events that happened before the story began. Like, when did Destro live? According to Ch 232, he was born when Quirks were still relatively new (possibly around the third or the fourth generation) and yet had a secret son who looks no older than 30. Also, Endeavor mentions he's been the Number 2 hero since he was 20 in Ch 165, so that mucks up Shoto's statements about Endeavor marrying Rei just for her Quirk since his oldest known sibling (Fuyumi) is 23. A little clarification would be nice.
  • Checking Endeavor's age, he's listed as being currently 46. Minus 23 + 9 months for Fuyumi's age, he'd have been around 22-23 approx when she was conceived.
    • Also wanted to add, we don't know when he realized he wouldn't be able to pass All Might. He may have realized before he became Number 2, but was still high ranked and had enough money to get his hands on Rei.

    Todoroki's Explanation 
According to Todoroki, Endeavor used his fame and wealth to force Rei into a Quirk marriage so he could have a child with Combo Platter Powers who could be strong enough to surpass All Might as the greatest superhero. However, not only Endeavor later monologues about how he chose Rei because her Quirk could combat his weakness, which would need no child to do so, but also he remembers her favorite flowers, which she mentioned only once when they first met. What makes it so strange is that no other character in the series is so contradictory as far as I know. How does it make sense?
  • Endeavor is a bad man, make no mistake. It doesn't mean he didn't have a feeling or two for his victims. It's also not a contradiction. He knew he couldn't match All Might, so just like All for One, he put some of his focus into a legacy. Maybe there was some attraction but primarily he wanted a child who had all of his power and none of the weaknesses. Clearly, he grew to care a little and maybe now he's had a wakeup call.

    U.A.'s number of staff 
This is something I just realized from rewatching the series: Just how many students does U.A. have? So I did a little multiplying based on all the current classes we know about. Classes A to B are Heroics, Classes C to E are Gen Ed, Classes F to H are Support, and classes I to K are Management. Assuming each class has 20 students total (based on Classes 1-A and 1-B) then there are 220 first years. Multiply that by 3 (the number of years the average high school in Japan has) and we get 660 students at most. Now here's the point of this: What about the staff? Not counting Nedzu as he's the principle, U.A. has 13 Pro Heroes working as both staff and teacher. That's NOWHERE near enough to teach 33 different classrooms. Even assuming Power Loader teaches all of the Support students regardless of class or grade at the same time, that still leaves 30 classrooms that need to be tended to. So does this mean U.A. has more Pro Heroes working as teachers, or do they have civilian teachers as well?
  • There probably are civilian teachers at UA that just aren't shown - given that the story is following Midoriya, we only see the teachers he and his classmates interact with. The Pro Heros (except for Power Loader) are most likely focused on teaching the Heroics classes, leaving General/Support/Management to civilian teachers.

  • Is there a need for Chisaki to claim Eri as his daughter rather than his adoptive niece on the sister's side?
    • To make it easier to control her. What would break the kid faster, someone who claimed to be her uncle leaving hope of the remote possibility of her parents coming back for her someday? Or her own "father" doing these horrific things? Chisaki needed her broken. He needed her so far into the grip of despair that there was little chance of her being able to escape it. And leaving her even the slightest glimmer of hope that someone might come back for her someday would prevent that. "No, he's lying, Mommy and Daddy didn't abandon me, they're coming to save me some day". Remember, it's all but stated that Overhaul's "care" is all Eri remembers. She doesn't remember erasing her father. She doesn't remember her mother cursing her and leaving. And while hope is frail, it's hard to kill, the most powerful emotion of all.
  • Why would Re-Destro know and share his surname with his father, who never acknowledged him in life?
  • Why would Destro not know his own son in life? Was he that irresponsible about the matter? Or else why?

Example of: