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- Early-Bird Cameo: A lot of the faculty get this treatment in the USJ arc and Sports Festival arc because their characters have debuted in the manga by the time these arcs premiered, allowing the anime to showcase a much richer pool of UA professors and heroes.
Toshinori Yagi — All Might
The highest ranked hero in the world and a pillar of hope and justice for heroes everywhere to follow. After an intense battle with a dangerous supervillain, he can only be his normal self for up to three hours a day. After he hits his time limit, he becomes a lanky, skeletal man who constantly coughs up blood. Only a select few staff at U.A. know this, and even fewer know the true nature of his Quirk. At the start of the manga, Midoriya proves himself to All Might and inherits "One For All".
- The Ace: All Might was a straight example of this and continues to be a unique one, even though having been severely injured gave him a time limit on his powers. Gran Torino deconstructs this, noting that he took to One For All much more easily than Midoriya did, which caused his teaching methods (which worked for him) to be less effective for his protege.
- Affectionate Parody: Of classic superheroes.
- All American Face: While he's Japanese, he's definitely a send up to this type of character. He's blonde with blue eyes (typical anime depiction of a western foreigner), massively buff when powered up, wears a costume with a red, white, and blue color scheme, and constantly goes on about justice. Hell, one of his attacks was called Texas Smash.
- Badass Teacher: Becomes a teacher at U.A.. He will also give a beating to anyone who tries to make his students suffer.
- Beware the Nice Ones: Is almost always smiling and is the type to always lend a helping hand to anyone in need. The key word is almost. If you somehow manage to get him to stop smiling, you know you're in for it.
- Big Good: A pillar of hope and justice for the world, with many aspiring to follow his example. Fittingly enough, he's thus the only one who matches the Big Bad in terms of power.
- Black Eyes of Crazy: Subverted since he's not remotely evil, but his eyes are black with brightly glowing blue irises.
- Blood from the Mouth: Happens to him frequently in his weakened form.
- Body Horror: His weakened form is extremely emaciated and constantly vomiting blood.
- Brains and Brawn: When he was paired up with Sir Nighteye, he was the brawn of the duo.
- Brought Down to Normal: Since giving Midoriya One For All, he finds that he's slowly losing his power over time, and it will eventually stop working completely. This finally happens at the end of chapter 94 after using the last vestiges of One For All to finally KO All For One.
- Calling Your Attacks: In reference to how he's based off of silver-age western superheroes, he shouts out the names of American states and landmarks. He doesn't always get it completely right, though.
- The Cape: Definitely. Almost to the point of parody.
- Catch Phrase: "I'm here!/I have arrived!" while making a Dynamic Entry and "Plus Ultra!" when trying to be inspiring or when showing off.
- The Chooser of The One: He chooses Midoriya to become his successor.
- Chronic Hero Syndrome: Played partly for laughs, but prior to the U.A. villain invasion, All Might stepped in to defuse a tense hostage situation, then moved on to stop a hit and run driver, and then... well, his commute to work ended up taking up all of the time he had that day for the use of his powers.
- Death Glare: He gives off an incredibly potent one, whether it be against villains who threaten his students, or even when he is acting out the part of a villain in Class-A's exercise against Bakugo and Izuku. When you see that glare, RUN.
- Deuteragonist: While the series as a whole is a Coming of Age story for Deku, All Might's influence and character drives the story just as much as Deku's journey does.
- Eagleland: Predominantly because of his The Silver Age of Comic Books traits, he tends to exhibit signs of the first type. For example his workout plan for Midoriya invokes the classical American Dream in its name... and the notion that those born with nothing, can one day achieve the greatest success if they work hard to earn it. Additionally, as mentioned, most of his attacks Theme Naming for states or major U.S. cities, typically "X Smash".
- Engrish: In the anime, he peppers his sentences with English words and phrases.
- Expy: Of Golden Age and Silver Age Flying Bricks. His ethos is almost straight-up Superman, the nature of his Quirk and backstory are rather more Captain Marvel, and his appearance could perhaps best be described as "Miracleman with Hair Antennae."
- A Father to His Men: He technically has only one man, Midoriya, but their relationship is very akin of a father and son. All Might often treats and trains Midoriya in a manner similar to how a stern but loving father would do to his son, considering that Midoriya's real father never appeared in the whole series, and only mentioned once, All Might often borders Parental Substitute.
- Game-Breaking Injury: All Might suffers from this as five years before the main story, he took a devastating hit from an unknown villain, which nearly killed him. While he survived thanks to numerous surgeries, his powers were disrupted such that he can only use them three hours a day. When he powers down, he looks like a emaciated husk of his former self that constantly keeps coughing up blood. Regardless, he keeps up his hero duties, with only Midoriya and a few of the top officials knowing about what happened, as he doesn't wish for people to lose faith in heroes like him.
- Gratuitous English: Frequently as part of his Large Ham tendencies.All Might: [in the Japanese dub] Oh my... oh my... GOODNESS!
- Hair of Gold, Heart of Gold: What All Might's true form used to look like. That is, before sustaining his near-crippling injuries from All For One.
- Heroic Build: His muscle form, obviously.
- Heroic B.S.O.D.: When All For One reveals that Tomura Shigaraki (a criminal that he's been pursuing) is actually the grandchild of his beloved mentor, Nana Shimura, All Might is horrified and filled with guilt. It takes a plea for help from a nearby civilian to snap him out of it.
- Heroic Second Wind: Over his time limit and severely injured, All Might is spurred into action again by the civilian he needs to save and the people looking on.
- Hour of Power: Thanks to his injury, he can only tap into his full strength for a few hours a day. After giving Midoriya his One For All, this time gradually grows even shorter. All For One explains that this is because All Might is now exclusively using the remnants of One For All as opposed to the full power he once had before and the more he uses it the weaker his power becomes. At end of his fight with All For One in chapter 94, All Might has now permanently used up the last remaining dregs of One For All.
- Incurable Cough of Death: As a result of his Game-Breaking Injury, he is practically emaciated when his powers are not in use and is prone to hacking up blood.
- I Work Alone: Subverted. Sir Nighteye's insistence in becoming his sidekick eventually led All Might to accept his help.
- Large Ham: If his bold outline and loud personality didn't make it obvious, he is constantly spouting speeches about heroism and how it's important for him to be a symbol of peace.
- Leeroy Jenkins: Gran Torino calls him as the "punch first, ask later" type.
- Legacy Character: It's eventually explained that he himself received "One For All" just as Midoriya did.
- Lightning Bruiser: Very few people can keep up with his sheer strength and speed. His only weakness is the time limit that his muscle form has.
- Moment of Weakness: In the first chapter, he nearly abandoned Bakugou to a supervillain because he had reached his daily limit. Seeing the powerless Midoriya rush said villain in an attempt to save Bakugou convinced All Might to break his limit regardless of the risk to himself to save the day. This incident was what convinced All Might that it was time to pass on the torch and that Midoriya was a prime candidate for it.
- Non-Standard Character Design: To go with his Large Ham personality, he is drawn in a thicker outline and has more shading than everyone else. He specifically has character design elements associated with the comic book creator Rob Liefeld, including a variant of the "Youngblood's disease" as his eyes are often hidden in heavy shadow or appear to be glowing. Ironically this also means despite being most inspired by a comic book art style it means he looks a more like a villain or morally dubious individual than he is intended to. His "true form" is also very different from everyone else, but in a more conventionally cartoonish and lanky sort of way.
- A few students even acknowledge this when he enters class for the first time.
- Not So Different: Reveals to Midoriya that he used to be Quirkless himself before getting "One For All" and pretty much had the same drive he did when he was younger.
- Meaningful Name: His surname contains the Kanji for "eight", referring to him being 8th wielder of One For All. It also has the character "tree/wood" in it, which likely refers to him being the pillar that currently upholds society as it is now.
- The Mentor: He tries to make Midoriya his successor and gives him his power. With U.A.'s help, All Might may find the true and worthy successor, but he hopes it will be Midoriya.
- My Greatest Failure: Discussed in chapter 70, there has never been a situation in which he hasn't made the outcome better, when he was there. All Might is for all his speed and strength still only a man, he can't be everywhere and for every situation he made better there were hundreds he could do nothing for, simply because he wasn't there. This is where being The Paragon is a double-edged sword, for all that he inspires to make others like him, he is seen as The Hero of the world, so when he doesn't show up to save the day it can breed resentment.
- Only Known by Their Nickname: Sort of. "All Might" is his hero name; but even in-universe nobody knows his real name, except for Gran Torino.
- O.O.C. Is Serious Business: When he arrives during the Villain Alliance's assault, All Might is not smiling. Even though he's in hero-mode, he isn't smiling. This is All Might we're talking about here; he is always smiling in hero-mode. That he isn't smiling makes it clear how he feels about the villains trying to get at him through his students.
- Papa Wolf: As the villains who attacked Class 1-A found out, trying to hurt his students is an easy way to get on All Might's bad side.
- The Paragon: All Might isn't the "Symbol of Peace" just because he's incredibly strong, but because he's devoted to inspiring the good in others. Many of the world's other heroes and heroes-in-training aspire to follow his example.
- Passing the Torch: How "One For All" works. It's a unique Quirk that is nurtured and passed down from generation to generation.
- Perpetual Smiler: In his powered up form, he nearly always has a giant grin on his face, though this is usually an act in order to reinforce the idea that he's an unassailable symbol of peace and justice. See also Stepford Smiler.
- Pre Ass Kicking One Liner: During his fight with Noumu:"So, you were made to fight me, big guy?! If you can really withstand me firing at 100% of my power...then I'll have to go beyond that and force you to surrender!"
- Primary-Color Champion: As seen above, his hero costume contains blue, red, yellow and white.
- Psychologist Teacher: Midoriya isn't the only student All Might tries to mentor after joining U.A.'s faculty as Bakugou and Todoroki also bring out his mentor side. He is also shown to be very encouraging to pretty much all his students.
- Rapid-Fire Fisticuffs: Beats Noumu by punching him 300 times.
- Red Baron: Known as "The Symbol of Peace".
- Recoil Boost: New Hampshire Smash.
- Renowned Selective Mentor: Passing One For All is done very selectively, considering its power. On top of that, All Might has very strict standards for taking on an apprentice. But of course, this is all done in secret with only a few in the know.
- Screw Destiny: When Sir Nighteye predicted his demise (and he had never predicted wrong), All Might quite literally said that he would just change his own fate.
- Showy Invincible Hero: What he is In-Universe. All Might is the strongest hero who is known for always winning his battles and saving everyone once he appears as the Symbol of Peace.
- Sink-or-Swim Mentor: If you think Aizawa is bad, All Might is even worse. Any poor soul paired up with him as their teacher/mentor for the day should expect a merciless beating. Doesn't matter if you're only in your first year, All Might will take you as seriously as he would a villain.
- Sir Swears-a-Lot: In the English dub at least, All Might actually has the foulest mouth relative to all the characters. He isn't constantly swearing, but he is the only one who ever says "shit".
- Spin Attack: Oklahoma Smash.
- Stepford Smiler: Puts on a brave face in hero-mode to live up to his reputation as a symbol of justice, but is all too aware that he's a fallible human being and that the day is rapidly approaching when he can't be a hero anymore. Chapter 92 reveals that he does this on the encouragement of his mentor, who argued that the people he rescues have been through a lot of trauma, so he should smile so as to save their hearts as well as their lives.
- Super Strength: One For All. The strength boost also provides Super Speed and In a Single Bound.
- Tragic Keepsake: "One For All" acts as this as it was entrusted to him by his now-deceased mentor and friend Nana Shimura.
- Up to Eleven: His fight with Nomu had Nomu able to match him blow for blow at 100% of his power, so he pushes himself beyond 100% and completely curbstomps Nomu.All Might: You may have heard these words before, but I'll teach you what they really mean! Go beyond! PLUS! ULTRA!!!
- Vague Age: How old is All Might? Mid-twenties, thirties, possibly approaching forty? The manga never makes it clear and the fact that he looks like a teenager in his weaker form only adds more fuel to the fire.
- What the Hell, Hero?: He gives one to Midoriya for going with some students to rescue Bakugo despite the risk of injury, even hitting him with a Texas Smash in his weakened form. Downplayed as All Might then turns the scolding into a So Proud of You speech promising to be a better teacher now that he no longer has One For All anymore.
- World's Best Warrior: The highest-ranked hero. Even though he has weakened a bit in the last years, he still managed to keep the top spot.
- Your Days Are Numbered: Nighteye urged him to retire because his Foresight saw All Might dying a gruesome death sometime. And while there's some nuance to Nighteye's Foresight, it's never wrong before; as of current, All Might has between 1 to 2 years to live. But he and Deku are trying to change that fate.
- Your Size May Vary: All Might's neck in his normal form ranges from normal, to noticeably long, to grotesquely long.
Shouta Aizawa — Eraserhead
- Voiced by: Junichi Suwabe (Japanese), Alex Organ (season 1), Christopher Wehkamp (season 2) (English)
Homeroom teacher of Class 1-A. Presented as a bit of a Lazy Bum, he's's really the former hero Eraserhead, whose Quirk, "Erasure", can erase other people's Quirks just by looking at them.
- Anti-Magic: How his Quirk, "Erasure", works on a basic level. By looking at someone, he can erase their quirk and prevent them from using it.
- Awesomeness by Analysis: As All Might notes, his observational skills are top-notch.
- Badass Teacher: Although his teaching methods can be rather questionable.
- Bunny-Ears Lawyer: Often teaches while still inside a sleeping bag. He is also willing to expel entire classes if he feels that they don't meet his very high standards. This is all overlooked thanks to U.A.'s own policy of academic freedom.
- Celebrity Is Overrated: Dislikes the attention of the media, believing that it gets in the way of his job as a hero. This results in him being very obscure to the general population.
- Cool Shades: Wears a pair when he goes in his Eraserhead persona, with the intent to keep his opponents from knowing who he's looking at. Particularly useful against a crowd.
- Combat Pragmatist: Since his Quirk only erases someone else's Quirk, Aizawa is completely fine using it at any time or way to win against his foes. Best shown in how, when fighting all the Villains who attacked during the USJ arc, he purposely would wait to use it to give him advantages.
- The Cowl: His general design is based on this trope, being an underground hero that avoids media attention and works as a Foil to All Might.
- Crippling Overspecialization: Due to how his Quirk works, he's a nightmare when fought one-on-one and his fighting style more or less revolves around the application of his Quirk to win his fights. However when fighting multiple opponents, his Quirk, while still strong, is much less effective since he has to maintain contact with them while also accounting for others who would be attacking. There's also the fact that his Quirk only works on Transformers and Emitters, so if any enemy uses a Mutation Quirk, he'll be completely unable to stop their attack.
- Cruel to Be Kind: His way of teaching, it is better to be mean and unfair to the students to help prepare them for the future of dealing with natural disasters and villains. He is more than willing to destroy a student's dream of being a hero if he finds they have no potential, but only because it would be wrong to give them false hope for the future or worse for them to be let into real world with no hope of surviving.
- Determinator: Shows up in the USJ arc, even after pushing his quirk to the limit and taking a severe beating by Nomu, including having his head repeatedly slammed into concrete, he still manages to stare at Shigaraki, preventing him from using his quirk to kill Tsuyu.
- Disappointed In You: To the whole class 1-A after the Hideout Raid: Out of the 20 students in the class, 5 of them decided to break all possible rules and save Bakugou by themselves, while other 12 students knew, nobody said a thing or stopped them. He said that he was more than willing to throw away all of them, but will not due to the circumstances and says it will take a long time until he is able to trust them again.
- He gives an even harsher verbal tongue-lashing to Midoriya and Bakugou when they get in an unsanctioned brawl. Aizawa still hasn't let Izuku off the hook for this incident and warns him that his maverick tendencies will be punished formally if he does something like this again. As for Bakugou, falling behind the rest of the class with extracurricular hero training is punishment enough.
- Expy: To Kakashi of Naruto. His stand-offish personality, a Magical Eye, and prefers to sleep all day if he could. He also has cats as his animal motif as opposed to Kakashi's dogs. He and Kakashi are also noted to have refused to teach students in the past because they didn't pass his personal test.
- His callous personality, overall appearance (build and hairstyle), and status as one of the protagonist's main mentors hearkens back to Tiamat from the author's first work, Barrage.
- His aversion to media attention, sticking to the shadows, reliance on sneak attacks, intellect, martial ability and a specialized non-lethal weapon, and his anti-social behavior can also make him the Batman to All Might's Superman.
- Foil: To All Might. All Might is the highest ranking hero in the world and uses his fame to inspire others while Eraserhead has a slovenly appearance and shuns the spotlight. All Might in his prime has incredible strength and stamina where Eraserhead has great skill, but prefers to strike quickly and with the element of surprise as he lacks the endurance for long, protracted battles. Lastly, All Might's power empowers him with the strength of many men, and his personality is to build up those who have the desire to do good. Eraserhead's Quirk robs others of their powers, and his personality is to tear down those who he feels show no potential.
- Genre Savvy: Before their attack against the Eight Precepts of Death, Aizawa admits to Midoriya that he wanted to cancel his internship and make him sit out of the mission, but changed his mind in the end because he's completely aware of Midoriya's Chronic Hero Syndrome by now, so he just let him participate anyway with the caveat that Midoriya will follow his orders as his commanding superior.
- Heroic R.R.O.D.: The more he uses his power, the longer it takes for it to kick in again when he blinks. This creates brief windows where his opponents can use their Quirks.
- I Lied: Proclaims that the one who ranks last in his exercises on the first day will be kicked out of the school. Then he says he was lying just to get more effort out of them. All Might calls him out on this, pointing out that in a previous year, he had expelled his entire class. Aizawa admits that he would have followed through if the one ranking last showed zero potential to be a hero. Since the one who did rank last, Midoriya, did show some potential in his eyes, he decided to pretend he had been lying.
- Jerk with a Heart of Gold: He may act like the stern, standoffish teacher, but it's shown that he actually cares about his students. During the simulated fight against Yaoyorozu and Todoroki, he allows Yaoyorozu to claim victory for the team instead of capitalizing on her mistake and defeating them, in order to allow Yaoyorozu to build up her destroyed confidence again. Also, he always prioritizes the safety of his students whenever villains enter the picture.
- Lazy Bum: Introduced sleeping on a floor in front of his classroom in a sleeping bag. He also often teaches while in said sleeping bag.
- Logical Weakness: Aizawa must maintain eye contact for his Quirk to work. This means depriving him of sleep or forcing him to stare at a single person for an extended period of time will make his eyes tired and thus reduce the effectiveness of his Quirk. Another is that his Quirk works on Emitter and Transformation Quirks, but not Mutation as they mutate the physical body structure and thus is permanently active.
- Magical Eye: It's by looking at someone that he can erase Quirks.
- Obfuscating Stupidity: Seems like an offbeat fellow but can get just as serious when the time comes.
- One-Man Army: Surrounded by villains with a few that can't be stopped by his eraser power. Doesn't stop him in the slightest as he reveals he excels at hand to hand even without his Quirk.
- Papa Wolf: Much like with All Might, attacking his students is a good way to end up in the hospital. He was also angered by the crowd during the fight between Uraraka and Bakugou, telling those that booed Bakugou for supposedly bullying Uraraka that they shouldn't be heroes anymore, because not only did they not notice Bakugou was playing it safe, but because none of them had noticed Uraraka had been setting up a big attack.
- Power Nullifier: His Quirk allows him to erase other people's Quirks rendering them helpless. However it only works on Emitter or Transformation types. Mutant types (i.e: Quirks that have changed a person's body) are immune to it.
- Renowned Selective Mentor: All Might mentions that he once expelled an entire class of students that didn't meet his standards.
- Scarf of Asskicking: A multi-layered one around his neck which he uses to bind his opponents.
- Scars Are Forever: Of all the wounds he received during the battle at USJ, the one that has stuck around was a horizontal scar under his eye. Though he always wears long sleeves so we don't know what his arms look like after all that happened to them.
- Stern Teacher: At first he seems to be an Apathetic Teacher, but it eventually comes to light that he just has high standards and very low opinions on those who don't meet them.
- Weak, but Skilled: Since his Quirk doesn't boost his abilities in anyway, Aizawa combines it with hand to hand combat. It makes him lethally effective since he is extremely smart on when to use it. Fittingly enough this contributes to his Foil nature with All Might.
- Weaksauce Weakness: His Quirk would be even more useful if he didn't suffer from dry eye.
- Would Hit a Girl: He's not shy about attacking female villains.
Yamada Hizashi — Present Mic
A hero who doubles as a DJ. Usually plays the role of event announcer whenever one is required.His Quirk is "Voice", which allows him to heighten the loudness of his voice for offensive purposes.
- Anime Hair: His hair is some sort of reverse pompadour that is three times bigger than his own head.
- This is only part of his hero attire, a sketch of him with casual clothes shows his hair is usually down and he is pretty normal looking.
- Badass Teacher: Besides being a professional hero, he also teaches at U.A..
- Big "YES!": This is actually one of his attacks.
- Catchphrase: "Everybody Say Hey!"
- Gratuitous English: Sometimes spouts random sentences in English. Incidentally, he's also Class 1-A's English teacher.
- Large Ham Announcer: Of the entrance exams and the Sports Festival.
- Make Me Wanna Shout: He can amplify the loudness of his own voice.
- Smarter Than You Look: Although he does not seem the brightest guy, he has a 5/5 Intelligence stat on the Official Character Book, which is above even Aizawa.
- Weaksauce Weakness: Bugs turn out to be a major weakness for him as he can't blow them away with his Quirk because sound can't travel underground, allowing burrowing bugs to sneak up on him.
- Why Did It Have to Be Snakes?: He's deathly afraid of bugs.
Chiyo Shuuzenji — Recovery Girl
- Voiced by: Etsuko Kozakura (Japanese), Juli Erickson (English)
The resident nurse of the school. Her Quirk, "Recovery", speeds up the recovery of injuries of her patients.
- Healing Hands: Played with, as her power allows her to magnify someone's own regenerative process.
- Intimate Healing: Her Quirk manifests through smooches.
- The Medic: She's the school nurse with the power to heal. You have to expect she's this.
- Miniature Senior Citizens: One of the oldest members of the school and naturally short in stature.
- Secret Keeper: She is one of the few people who knows everything about All Might's Quirk. This is because she was one of the people who helped him through his long and troubled recovery after All For One brutally maimed him, and not even her power was enough to completely fix him back up, because some of his organs were outright gone and she can't recreate lost body parts- that's a totally different Quirk entirely.
- What the Hell, Hero?:
- Delivers one to All Might when Midoriya's drive to meet his expectations results in three limbs so broken they can't be healed with her Quirk the normal way, requiring surgery.
- Does it again after the training session in which Deku and Bakugou are brutally beaten by All Might's overwhelming strength, saying that Deku's lower back was within a hair's breadth of snapping beyond all recovery.
- Voiced by: Inuko Inuyama (Japanese), Morgan Berry (English)
Nicknamed "Space Hero No. 13", he is a teacher that overlooks the rescue exercises. A man in a space suit who is known for working with disaster relief. His Quirk is "Black Hole".
- All-Loving Hero: There's a reason he's the guy teaching kids how to use their power for good - he outright believes ANY power can be used to save lives, and that saving lives is their natural use.
- Ambiguously Human: It's unknown how he looks under that space suit. When he nearly dies due to Kurogiri, the audience only sees the empty part of the suit and nothing more. Even Word of God wonders about it.
- Bad Powers, Good People: His black holes are used exclusively for disaster relief and sometimes the capturing of villains. However 13 is a All-Loving Hero who cares deeply for the students.
- Cross-Dressing Voices: Is voiced by women in both the original and English dub, of course, we're still not sure what's under his suit.
- Powered Armor: His spacesuit is designed to keep his black holes under control - for example, his fingers have little caps he can flip up and use the gravity of the black holes he produces inside to vacuum-clean debris and pull things toward him slowly.
- Power of the Void: Uses his black holes for clean up during rescue missions, but mentions that he has to keep control over it so that it doesn't kill the people he's trying to rescue. This is because his black holes pretty much disintegrate everything it sucks to a molecular level.
- Unrealistic Black Hole: His Quirk can essentially be described as black hole fingers.
- Unskilled, but Strong: Kurogiri pretty much says this; being that No. 13's Quirk is very dangerous, but he himself has no experience fighting villains, to his detriment.
Ken Ishiyama — Cementoss
- Voiced by: Kenta Okuma (Japanese), Chris Rager (English)
- Ambiguously Human: There's a reason he's described as a "being".
- Badass Teacher: He's also the Modern Literature teacher.
- Dishing Out Dirt: Anything with concrete he can control.
- Home Field Advantage: Very powerful in urban settings thanks to the abundance of concrete.
- Logical Weakness: Doesn't fare well in areas that have no concrete for him to manipulate, such as forests and such.
- The Knights Who Say "Squee!": He is a Hero and a big fan of All Might.
- Secret Keeper: In the know about All Might's condition.
Nemuri Kayama — Midnight
- Badass Teacher: She teaches Modern Hero Art History, whatever that means.
- Barbie Doll Anatomy: Doesn't appear to be wearing anything to cover her breasts, but also has no visible nipples. Though in one omake, she states that she's actually wearing super-sheer tights.
- The anime makes it much more noticeable they're tights.
- Bond Villain Stupidity: Had she stayed at the escape gate, she could've run down the clock and failed Sero and Mineta from the exam. However, her sadistic nature led to pursuing Mineta, only to get pinned down by his Quirk far away from the gate.
- Chained by Fashion: Has two handcuffs on her wrists.
- Christmas Cake: In an omake, Mount Lady accuses her of being this by making a catty comment about her age (which is 31).
- Knockout Gas: Her Quirk.
- Meaningful Name: Her real name is pun on sleep. Her hero name actually has two different meanings, referring to midnight as in bedtime, and midnight as in her after-dark nature as a hero catering to a more adult crowd.
- Ms. Fanservice: Rivals Mount Lady in this department.
- Sadist: Watching someone run away in terror gets her heart throbbing.
- Shameless Fanservice Girl: Just in case the outfit and S&M theme didn't give it away. And she doesn't see any problem whatsoever with refereeing the freshman class's events in costume, either. And in the above-mentioned omake, it's heavily implied that her costume used to actually leave her breasts exposed instead of being covered by super-sheer tights, and she only changed it when she was forced to by legislation to regulate how much hero costumes can expose. Some UA students even wonder what she's doing when she's explicitly been billed as an "over-18 hero" not suitable for children- except resident pervert Mineta, who protests at the very idea the students disapprove of her.
- Stripperific: Her outfit just screams this.
- Invoked Trope. In order to use her power, she has to rip part of her tights herself. This would mean that exposing as much skin as possible is necessary for her to be effective.
- Whip It Good: As expected of a S&M-themed hero.
A sharp-shooting hero. His name and design previously appeared in the My Hero one-shot which served as a prototype for My Hero Academia, where he was once a hero named "Positive" before assuming his Snipe persona- it should be noted that there is nothing to suggest this is still the case in the finalized work, and here he may have been Snipe to begin with.
- Big Damn Heroes: Annouces the presence of the arriving pro heroes to the invading villains of the training grounds by hitting a good number of them with his aiming skills. He even nearly severely wounds Shigaraki before Black Mist warps him out of there.
- Improbable Aiming Skills: He shoots a villain on the arms with perfect accuracy...from the other side of the campus... with a pistol. As shown in the anime, he's able to casually snipe a villain who was in the process of restraining Kaminari in the shoulders through a relatively narrow crevasse from the other side of the facility. He then shoots Shigaraki through his hand, shoulders, and legs in rapid succession from a similar distance. Again, with a pistol. It's somewhat justified by his Quirk, Homing, which allows him to alter the trajectory of his bullets, but he is still doing so while they're nothing more than a spec in his field of vision or while they're behind obstacles in such away that he barely has any sight on his targets at all.
- Brought to You by the Letter "S": His hat has a big "S" on it, referring to his name.
- Cool Mask: Wears a stylish gas mask.
- The Gunslinger: His Weapon of Choice is a gun, fitting his cowboy theme.
- Hand Cannon: Wields an oversized, double-cylindered pistol.
- Superhero Packing Heat: As expected of a hero sharpshooter.
- Too Many Belts: Wears at least 3 or 4 of them under his poncho.
A hero with a ghostly theme. His Quirk, "Clones", allows him to create copies of himself out of ectoplasm coming out of his mouth.
- Attack of the 50-Foot Whatever: He can create a huge copy of himself.
- Badass Longcoat: He wears a heavy trenchcoat in costume and lets the collar stick up like the mantle of a cape. This is not to be confused with a Coat Cape where someone drapes their coat on their shoulders, because Ectoplasm wears his over his entire body.
- Dark is Not Evil: Very creepy-looking, but he's a hero and a teacher.
- Expy: Of Spawn, particularly of his later redesign which included similar teeth to Ectoplasm's and their Mystical High Collar (though Spawn's is part of his red cape while Ectoplasm's is white), who is a genuinely undead '90s Anti-Hero.
- Handicapped Badass: He lost his leg in a past battle against a villain, and now uses two prostheses: a normal one for everyday civilian life and a lightweight one for heroism.
- Me's a Crowd: His Quirk. He's limited to creating around 30 clones of himself at once. He can also create a big copy, but at the expense of not being able to create more clones while the big one is active.
- Nightmare Face: He looks scary even without his mask.
- Our Ghosts are Different: If you can even call ectoplasmic copies that are belched out by a superhero "ghosts" to begin with.
- Soul Power: Can manipulate ectoplasm to form clones of himself.
Higari Maijima — Power Loader
A Hero Support teacher and pro hero who wears an animalistic suit of mechanized gear.
- Gadgeteer Genius: He is the resident tech teacher, able to help in designing and upgrading hero costumes and gear. He is also Mei Hatsume's teacher.
- Powered Armor: He wears a suit of armor.
- Slasher Smile: It seems to be his default expression.
- Walking Shirtless Scene: He doesn't wear anything covering his torso.
Kan Sekijirou — Blood King
The Homeroom teacher of Class 1-B. His Quirk is "Blood Manipulation".
The School Life Supervisor.
- The Unintelligible: Starts barking and growling when he's worked up. Since he's introduced immediately after Bakugo and Izuku's fight, he's so mad that he can barely get more than three actual words out.
Principal — Nedzu
The principal of U.A. Academy. His appearance resembles some sort of furry animal. His character sheet reveals that his real name is Nedzu (a play on the word for "rat" in Japanese) and that he is an extremely rare case of a Quirk appearing in an animal.His Quirk is "High Specs", which grants him Super Intelligence.
- Animal Superheroes: Naturally. Being a Superhero is one of the requirements for one to become a teacher at U.A.
- Being Tortured Makes You Evil: Mostly averted, as he chose to use his intelligence for heroic ends despite the experiments that were performed on him, but that doesn't mean that he won't enjoy the occasional opportunity to make humans squirm.
- Cartoon Creature: Lampshaded in his very introduction. He is supposedly a mouse, but that wouldn't explain his size.
- Character Filibuster: All Might lampshades it best.All Might: With the principal, if I let him go on it'll never end...
- Everyone Calls Him "Barkeep": Actually has a real name, but has so far only been referred to as the school's principal.
- Evil Laugh: When showing his "darker" side.
- Fully Dressed Cartoon Animal: He's some kind of animal, but wears clothes just like humans.
- Intellectual Animal: Thanks to his Quirk, he's actually smarter than any human.
- Large and in Charge:Inverted. He is the smallest teacher in U.A and its principal.
- Petting Zoo People: Actually an animal who was morphed to have a anthropomorphic body by his Quirk.
- Reasonable Authority Figure: So far, he appears to be a nice, smart and trustworthy person, enough to be one of the few people that knows about the true nature of All Might's "One For All".
- Rodents of Unusual Size: Part of the reason he gives off Viewer Species Confusion is that he is too big to be a mouse.
- Rugged Scar: Has one on his right eye. It's almost undeniable that he got it from the many abuses inflicted on him through experimentation.
- Shoulder Teammate: He is occasionally seen sitting on his colleagues' shoulders.
- Super Intelligence: His Quirk, and its not that he is an animal with human level intelligence, his Quirk has made him the smartest person on the planet.
- They Would Cut You Up: As an animal with a Quirk, he was experimented on when he was first discovered.
- Viewer Species Confusion: His species is indeterminate. As he himself says, he might be a mouse or a dog or a bear.