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A minor criminal and main antagonist of the series' first chapter.
- Ambiguously Human: Of all the "humans" introduced so far, he is definitely the least human-like.
- Blob Monster: A mud-like entity.
- Grand Theft Me: He is able to take over the bodies of victims, and is also able to use their Quirks against their will.
- Human Shield: Uses Bakugou as one to keep the heroes from attack him. It works until All Might creates enough gusts strong enough to blow him off of Bakugou.
- Nigh-Invulnerability: Physical attacks are mostly useless against him, but he's still vulnerable to Blow You Away, so All Might manages to beat him by punching the air against him really hard.
- No Name Given: He is never given a name. The closest thing he has to one is the name people gave to the event he was part of, "The Sludge Incident".
- Sealed Evil in a Can: Almost literally. All Might manages to imprison him in a plastic bottle in their first fight, but he is still able to easily escape.
- Small Role, Big Impact: If it weren't for his existence, Izuku would never have convinced All Might to make him his successor, let alone met him.
- Starter Villain: He is just a random criminal who serves to kickstart the plot and to showcase All Might's overwhelming power...
- Wake-Up Call Boss: Regardless, he was definitely not in the bottom of the Sorting Algorithm of Evil, requiring the all-powerful All Might to defeat him while giving a lot of trouble to a bunch of pros. It could be argued that he was a bigger threat than Tomura Shigaraki at the time.
Chizome Akaguro — "Hero Killer" Stain
An independent villain who is famous for killing or crippling heroes that he considers "fakes" (essentially, Heroic Wannabes). He allies himself with the League of Villains not only to make it stronger, but also to strengthen Tomura as a villain as well. His Quirk is "Bloodcurdle".
- Arc Villain: Of the Field Training Arc.
- Bad Powers, Bad People: Played with. A guy that can paralyze anyone through the tasting of their blood sounds as villainous as one can get, but the fact is that he was once an aspiring hero student himself, so at one point he was a case of Bad Powers, Good People.
- Big Bad Duumvirate: Alongside Shigaraki, he was the main antagonist of the Field Training Arc. Also counts as The Heavy of the arc, as Shigaraki had more of an observer role during it.
- Blood Magic: Not quite magic, per se, but ingesting a person's blood allows Stain to then immobilize them with his Quirk. Certain blood types are more susceptible to this than others.
- The Cameo: He makes a surprise reappearance in Chapter 94 sharing the same prison as All For One.
- Close-Range Combatant: His only ranged attacks seem to be hurling knives or his sword. This helps close the distance to use his Quirk.
- Combat Pragmatist: A vicious fighter who ambushes solitary targets in dark alleyways. He'll also attack while an enemy is speaking.
- Determinator: Absolutely will not give up in his quest. When he's outnumbered and put into a disadvantageous position, he just fights that much more viciously. Even after being beaten into unconsciousness, he summons the strength to paralyze the winged Noumu and stab it in the brain when it tries to carry Deku away. In the end, he only relents after passing out from a broken rib perforating his own lung.
- Died Standing Up: Subverted. At the end of his fight with Deku, Iida and Todoroki his broken ribs perforates his lung, but it's not lethal and he passes out while standing.
- Dual Wielding: With his katana and any one of his array of knives.
- Early-Bird Cameo: Stain appears as The Stinger in the season 1 finale of the anime in order to entice viewers for season 2.
- Enemy Mine: Toward Tomura and the Villain Alliance. Despite their starkly opposite opinions of All Might, they're able to make a tentative alliance over their shared desire to destroy the status quo.
- Even Evil Has Standards:
- In spite of being a mass-murdering loon, Stain finds Tomura and his plans to be vile, equating him to a child throwing a temper tantrum, and stating that spilling blood without (what he considers to be) a proper cause is senseless.
- His reasoning for crippling and even killing heroes is that they don't adhere to his standard for what a hero must be like. Personal pride, vendetta, or just not measuring up are all reasons for Stain to target you. In a sense, you call it "Evil Because He has Standards."
- Evil Counterpart:
- His respect for All-Might and desire for justice (though, a more extreme example) makes him another one for Izuku.
- The conflict between him and Tomura is also a villainous echo of the one between All Might and Endeavor. Like Endeavor, Tomura is essentially a rival who resents Stain's popularity amongst the villain community and doesn't get why Stain gets so much respect and adulation.
- Evil is Cool: In-Universe, after Stain is captured many people including Iida admit that for a crazed murderer there was something "cool" about him. So much so that he inspired many up and coming villains to take up his cause and join the Villain Alliance.
- Expy: His role in the story, and his status a s a self proclaimed "Hero Killer", is similar to Garou.
- Fallen Hero: As it turns out, he once was an aspiring hero himself, and went to a prestigious institution to train. However, after less than a full year there, he became jaded when he felt that the system had decayed and that heroes weren't becoming heroes for the right reasons anymore. And after spending some time as a street soapbox advocate for his ideals; he decided that violence, not words, was necessary in order to get his message across and to fix the system.
- Fights Like a Normal: Since he needs to draw blood from his target before he can use his paralysis Quirk on them.
- Four is Death: His pattern is that whenever he operates in a particular area, he attacks at least four heroes before moving on.
- Hero Killer: Has singlehandedly killed and maimed dozens of professional heroes, one shots a noumu while already beaten to hell and then promptly intimidates two seasoned heroes without even trying. It's in his name and this is why.
- Irony: He wants to purge society of heroes who only seek fame and glory. He's used by the Villain Alliance to promote villainy, exactly the opposite of his intentions.
- The fact that Endeavor, a defining example of the Fake Heroes he sought to destroy, took credit for defeating him.
- Killing Intent: One so terrifying that it freezes everyone in place, even Endeavor.
- Knife Nut: Along with his katana, he has several combat knives on his person.
- Knight Templar: His goal might be considered noble to an extent, but his methods to attain said goal are definitely cruel and horrifying.
- Licking the Blade: Not only does this show that he is a major psycho, but it's also his main method of activating his Quirk.
- Lightning Bruiser: He's so fast that Todoroki's fire and ice attacks can't keep up with him. When he gets serious, even Deku's 5% "Full Cowl" is outpaced. He's also strong enough to easily cut through Todoroki's ice. It's especially notable because his strength and speed aren't related to his Quirk.
- Loony Fan: Of All Might. He attacks other heroes out of a belief that they've corrupted All Might's heroic ideal.
- Meaningful Name: Killing seventeen named heroes and crippling twenty-three to the point of being unable to fully recover, including Ingenium, Iida's brother, demonstrably shows that his moniker is no joke.
- His real name literally means Red-Black Blood-Stain.
- '90s Anti-Hero: He's got the ideals and look of one. With how he's drawn, he looks like a cross between a Frank Miller and a Rob Liefeld character.
- Overly Long Tongue: Possibly as a result of his Quirk, but definitely a creepy and prominent trait.
- Secret Test of Character: Uses this on Tomura, as Stain believes people only show their true face at death's door.
- Shout-Out: His lack of a nose, bandana-mask, and the several sharp implements he wears on his person make Stain look like the Ninja Turtles during their Darker and Edgier early years.
- Serial Killer: Of the Mission-Based variety. Stain thinks that he is making the world a better place by killing/crippling "fake" heroes.
- Tautological Templar: Essentially, he believes that what he is doing is the right thing and is so dedicated that he matches the heroes in convictions.
- The Noseless: Has a very strange, noseless facial structure that, when combined with his face mask/bandanna, oddly makes him bear more than a passing resemblance to an evil Ninja Turtle.
- Once his mask is off, it's revealed that he almost definitely DID have a nose at one point, but now all that's left is a hole in the middle of his face.
- The Paragon: In a rather dark twist of this trope, his hero-killing actions actually end up causing heroes to become more aware and competent at their jobs, with the murdered heroes being treated as "sacrifices" to reach that result.
- In an ironic twist, it turns out that, after his defeat and his philosophy became more well-known, he became a paragon of a different kind; now several villains, being affected by his words and hearing about his affiliation with a "Villain Alliance", are starting to gravitate towards the Alliance.
- The Paralyzer: His Quirk allows him to immobilize victims, by ingesting their blood.
- The Only One Allowed to Defeat You: Actually turns this around on himself, saying that All Might is the only "true" hero there is, and therefore he can't allow any other hero to defeat him.
- Unwitting Pawn: Kind of. Stain wasn't actually part of the Villain Allaince, but Gran Torino believes that the Big Bad behind the Alliance used Stain to give them publicity, of a sort.
- Vader Breath: Breathes rather loudly and raggedly with a "Hahh..." sound effect, with it often punctuating his speech.
- Villain Has a Point: He chastises Iida during their fight for his need for vengeance, rather then trying to focus on helping a fellow hero which Stain injured. He then drives in the nail further by stating that Iida's actions taken are the furthest thing from being a hero.
- Villain Takes an Interest: He likes Deku because he's one of the few who unambiguously embodies what he feels a true hero is. This was probably a factor in him saving Deku from a flying Noumu, that was about to carry him off to who knows where.
- Weak, but Skilled: Quirk-wise, he's not as strong as say, Todoroki or Deku. But he's honed his skills to the point that his Quirk can be used to its maximum potential. Combat ability-wise, he's on par with Eraserhead in this regard.
- Well-Intentioned Extremist: He targets heroes he consider unworthy, those who act for their own personal sake first and foremost instead of others'. Considering he's willing to spare, even rescue those he deems worthy, he's not entirely wrong.
- What the Hell, Hero?: Calls out Iida for focusing blindly on avenging his brother, rather than aiming to save the hero Stain injured.
- Would Hurt a Child: Gives Iida a chance to back off when he notices how young he is, but decides to make an example of him when Iida calls himself Ingenium, a hero.
- You Will Be Spared: If he considers a Hero to have proved themselves as truly being Heroic, Stain will spare their life even if he has them at his mercy.
- He will even go so far as to save them from others he considers to be wrong, such as when one of the mutated monsters grabs Midoriya, who at this point had proven himself to Stain as a real hero, and flies away with him, Stain kills the monster and brings Midoriya to safety.
A group of villains who appear during the surge of crime after All Might's retirement.
- Always Someone Better: They manage to take down a pro hero, but are soon defeated by Overhaul's own group of villains.
- Cruel and Unusual Death: Averted.
- Evil Is Petty: Lampshaded by Overhaul; how despite being made up of several villains gathered together, the group is content with merely robbing convenience store registers.
- Harmful Healing: Their true fate, after being seemfully killed by Overhaul. After the intense pain, they saw their respective physical and mental diseases being entirely healed.
Eight Precepts of DeathA group of dangerous Yakuzas, lead by Overhaul and with the plan of taking the Leader of the Underworld title that was once held by All For One.
A young and strange villain who is taking down other villains, believing them to be sick. His quirk, "Overhaul", allows him to assemble and disassemble anything.
- Abusive Parents: If what he says about Eri being his daughter is true, then he's definitely this. He has been repeatedly drawing his daughter's blood for a while in order to create a quirk erasing-drug.
- Ambiguous Disorder: He seems to have some degree of OCD, or of Mysophobia. As soon as he is touched, he gets extremely uncomfortable and violent, besides his constant comments about cleanness and dirtiness.
- Animal Motifs: Everyone in his group wears some kind of beak like mask, much like his plague doctor's mask, making the lot of them look like birds.
- Bad Boss: He's fully willing to use his subordinates as meat shields, only seeing their deaths as minor inconveniences, and he kills casually kills another lackey after retrieving Eri.
- Bad Powers, Bad People: When your powers end up making people explode by touching them, you don't have much of a choice in life.
- Cool Mask: Referring to his motif as a Plague Doctor.
- Disproportionate Retribution: He blows off Compress's arm not for attacking him, but for simply touching him.
- Establishing Character Moment:
- His first moment has him creepily stating that the sick villains must be cured.
- And then there's him killing Magne by making his upper body explode.
- Eviler Than Thou: He sees himself as this to Shigaraki.
- Exact Words: He believes that the sick villains must be cured and this is exactly that he has done to Reservoir Dogs, by healing them from their diseases after defeating them.
- Foil: To Shigaraki. Both have Touch of Death powers, lead groups of villains and want to take the spot of All For One as king of the underworld. Shigaraki is however, a Psychotic Manchild, who often relies in sheer strength to solve a problem and ignores the idea of making complex plans or seeks any gain that is not simply take All For One's spot, while Overhaul is level headed, keeps a calm tone all the time and has a bigger plan to take over, which includes large sums of money or getting Shigaraki's "overhyped villains". This goes down even to their design: both hide their faces, but while Overhaul still seems to have a relatively normal face that shows seriousness and calm, has dark hair and clear eyes, Shigaraki's hand covers all of his face besides his eyes and is way creepier, has gray hair and red eyes.
- Good Powers, Bad People: His Quirk has both Touch of Death and Healing Hands functionality.
- Hates Being Touched: Compress touches him, cue Overhaul looking very uncomfortable, "Don't touch me." cue Compress losing his entire left arm.
- Healing Hands: Apparently his Quirk also encompasses healing, as the Reservoir Dogs have been shown to be alive, well, and cured of their illnesses.
- The Leader: To the "Eight Precepts of Death".
- Plague Doctor: His motif. His Quirk, in addiction of being able to kill his targets with a single touch, is seemfully able to heal the physical and mental diseases entirely, through the intense pain.
- Pragmatic Villainy: He generally wants to avoid killing people, mostly because he doesn't want to get their blood on him.
- "The Reason You Suck" Speech: He makes sure that Shigaraki knows how little he thinks of the leader of the Villains Alliance, since he managed to lose after garnering the help of first grade villains such as Muscular, Stain and Moonfish.
- Skewed Priorities: He's more concerned about his enemies touching him rather than attacking him, which is why he blew off Compress's arm.
- Touch of Death: Can cause people to explode with a touch.
- Yakuza: And apparently one of the last few remaining in present day Japan since the rise of All Might, Magne had never even seen one before Overhaul, and Toga didn't even know what a Yakuza is. As Compress put it: "...He's an endangered species left over from old times." Overhaul says he isn't wrong.
- Wide Eyes and Shrunken Irises: His default mode, which adds to his creepiness.
- Would Hurt a Child: To Eri. Repeatedly too, as he has been repeatedly taking her blood it what appears to be a very painful process.
A member of the Eight Precepts of Death who serves as Overhaul's assistant.
- Cool Mask: Following the motif for the rest of the Eight Precepts Chronostasis wears a Plague Doctor mask that covers his entire face.
A member of the Eight Precepts of Death who serves as the groups General Manager.
- Partial Transformation: During Overhaul's meeting with Shigaraki Mimic transforms his body into an arm to grab Shigaraki.
A group of eight villains whose sole purpose in life is to protect Overhaul, at all costs.