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The VigilantesA trio of unregistered "heroes" taking to the streets to deal with the problems professional heroes either don't know, care, or (in rare cases) have the ability to do anything about. Banding together over "circumstances" (read: Knuckle Duster dragging the other two kicking and screaming), they deal with crime in their special way while trying not to get arrested by their stronger, more organized counterparts.
- Almighty Janitor: Despite all they've done for the city and their advances in fighting against a lethal drug trade, the best exposure and recognition they've gotten are tabloids misprinting Kouichi's hero name. Pop is the only one that the people notice and not for the right reasons.
- Anti-Hero: They're all this by default, as unauthorized Quirk usage is considered illegal, even if it's with good intentions like playing a hero.
- Ragtag Bunch of Misfits: Their ranks consist of a college-level social outcast, a high-schooler moonlighting as a popstar, and a Badass Normal 30-something man trying to show his stuff against the other heroes of the world.
- Vigilante Man: As the title suggests, they are all vigilantes who work outside of the law.
Kouichi Haimawari / Gentle Man / The Crawler
The hero of the story. A 19-year-old who wants to be a hero but his Quirk, Sliding, which is an ability to slide around on the ground at the speed of a bike when three of his limbs are touching it, made him unfit for service. Eventually he decides to get serious, dons a costume after hours and does "hero work" (really just self-imposed public services like directing people, picking up dropped item, helping the elderly cross the street and cleaning up trash), until an encounter with Knuckle Duster changes his life.
- Accidental Misnaming: After changing his hero name, people still don't bother to remember it, calling him "The Hauler."
- Adorkable: Some of his smiles he makes as a result of Good Feels Good put him in this territory. Not to mention that he is an Extreme Doormat and an overall Nice Guy.
- Berserk Button: He's a pretty mellow guy most of the time but he will not let anyone insult his costume. It's one of the few genuine things that can get him angry.
- Bishōnen: Averted, surprisingly enough. Koichi is fairly generic-looking, neither ugly or particularly pretty either.
- Clark Kenting: The worst offender of the group, as his "costume" is just him wearing the hood of his All Might jacket, pulling his shirt up to cover the bottom of his face, and wearing tinted shades (which he rarely uses) to hide his eyes.
- Classical Anti-Hero: He's a bit cowardly and kinda lame, but he has the true spirit of a hero, even if he has to be a hero outside the law as a vigilante.
- Combat and Support: He and Pop are the support to Knuckle Duster's combat, getting civilians to safety and tripping up villains while their leader goes to town.
- Expy: Of Spider-Man, or more specifically, Peter Parker and his civilian life due to how life has a tendency to browbeat him. Likewise, his sliding pose resembles Spider-Man's wall crawl and even referenced as a bug, but outside of that he doesn't have any of his spider powers.
- Extreme Doormat: Knuckle Duster and Pop Step pretty much invite themselves into his home without permission and he doesn't even bother trying to get them to leave.
- Foil: A good one towards Izuku. Both start out as weak and wanting to be heroes. However whereas Izuku is intelligent and can figure out the true potential in most Quirks and started out without one, Kouichi was born with one, but never even tried to experiment with it and needed other people to point out how to use it. This goes all the way down to their appearances too. While Izuku has a head of striking green Messy Hair, Youthful Freckles, and is ripped for his age due to his intense training, Kouichi is fair, tall and lanky with short, normal brown hair due to his relatively mundane life style.
- Forgotten First Meeting: Actually saved Pop from drowning as a little girl on the way to his High School Entrance Exam. But he thought she was a little boy, and was in too much of a hurry after the rescue to note otherwise.
- Good Feels Good: Is genuinely gratified by the little things he does for others, being the primary reason he's stuck around with his group despite the fact that it's illegal.Kouichi: [To Pop-Step while cleaning up a park] "I'll stop picking up trash because it's uncool?" That just doesn't feel right. That's not the kind of man I am.
- I Just Want to Be Badass: Even knowing it's too late for him now, he still dreams of being a real hero, just for once in his life.
- Irony: Turns out that Kouichi did try to get into a hero school, but didn't get to the exam on time because he was busy saving someone. So he didn't get to become a hero because he was being a hero. Also the person whose life he saved turned out to be Pop Step.
- In the Hood: His "Hero" costume is just a hoodie with bunny ears on it. Many people just mistake him for a All Might cosplayer. Turns out he has quite a few as part of a collection of Annual All Might Hoodies.
- Meaningful Rename: He's originally called Gentle-Man when his "heroism" consists of small acts of public service. After he joins up with Knuckle Duster and starts actually trying to fight criminals, he changes his hero name to The Crawler.
- Nice Guy: Even after becoming "The Crawler", he still goes out of his way to help others for no benefit to himself, keeping kids from getting into the street, cleaning up after others and reminding them not to litter, giving people rides to work, and handing a man the lunch he forgot to pack at the behest of the man's wife.
- No Good Deed Goes Unpunished: As described under Irony, Kouichi didn't fail to get into Hero School due to a lack of merit or a bad Quirk, he failed to get in because he was too busy trying to be a hero by saving a child who had fallen into the river.
- Refusal of the Call: Knuckle Duster offers to let him partner up to fight against criminals. But after getting a taste of what real hero action is like, Kouichi initially refuses.
- Required Secondary Powers: He can speed up his glide but he can't slow down, which is why he usually stays at a manageable bicycle speed. It's not until he obtains protective motorcycling gear and learns how to fall safely that Kouichi starts going faster. It's eventually subverted when it's pointed out he can slow down by just going backwards, then a deconstruction as his Quirk limitations are due to his lack of training and experimentation to find its true potential.
- Technical Pacifist: Despite wanting to be a hero, he shrinks at the first sign of mortal danger, and his definition of heroing is just doing public services, like picking up trash or pointing out directions to people.
- What Kind of Lame Power Is Heart, Anyway?: His Quirk lets him move around at the speed of a bike, and he has to take a crawling pose for it to work. Actually using it gets him chewed out by a policeman. In battle he figures he can go for his opponents' knees, but he doesn't have the strength or experience to pull it off. However...
- Heart Is an Awesome Power: ...his quirk works on "vertical" surfaces as well, allowing him to scale buildings with ease. Plus he CAN go faster than a bicycle, he just can't brake. Until Tensei Iida (Ingenium) crosses paths with Kouichi and offers some advice, upon which he can go fast enough to catch up to a truck as it drove away while having enough maneuverability to make hairpin turns and slide through narrow alleyways without bumping into anyone.
Kazuho Haneyama / Pop Step
A girl who fashions herself as a Pop Idol and does "Guerilla Concerts" in public. Her Quirk is Bound, which allows her the ability to jump high into the air long as she can touch a foothold.
- Attention Whore: Intentionally just a self-proclaimed Idol for fame and whatnot.
- Clark Kenting: She's a plain-looking schoolgirl when she's not wearing her costume, complete with glasses.
- Distressed Damsel: Ended up bumping into the punks Kouichi gained the ire of earlier who seriously were considering harming her and exposing her identity to the internet. Likewise ends up being caught by a drug dealer turned giant monster in the second chapter.
- Favors for the Sexy: Utilizes her fanbase in this way to get intel, as they're more than happy to share anything with her.
- Jerk with a Heart of Gold: She's somewhat nice, thanking Kouichi for warning her of the cops that have come to break up her show. But then she starts showcasing her rude side, about commenting how lame his costume is, and trying to coax him into being her security. And by coax we mean demand...for free.
- In a Single Bound: She uses her Quirk to "jump" in the in air as long as she has a foothold to jump off of.
- Magic Idol Singer: How she fashions herself anyway. It's unknown if she's truly trying to be a hero or just to get noticed.
- Mission Control: Since she has the least combat ability out of the trio, she spends most fights gathering information and being an eye in the sky to the others.
- Nominal Hero: While Kouichi and Knuckle Duster became vigilantes to do good, Pop Step doesn't have a reason to join and will admit she's not part of the group to anyone that asks. It's later implied she joined to stay with her childhood rescuer Kouichi and repay the favor by helping him.
- Pretty Freeloader: Starts crashing at Kouichi's place without permission.
- Rescue Romance: Was saved from drowning as a little girl, and grew up with a case of Hero Worship for her rescuer Kouichi.
- Shameless Fanservice Girl: Wears a skirt, does all her performances in the air and apparently has no problems with showing people her panties as she does it.
- She Cleans Up Nicely: As Kazuho she's a frumpy-looking student, but as Pop Step she's very attractive to the point of having her own fanbase.
- Tsundere: As Kouichi puts it, "she can't bring herself to apologize," and tends to hurl insults or accusations at people instead of being honest with her feelings. She especially becomes one around the person who rescued her as a child.
- Vapor Wear: As Pop Step, her butt is pretty much bare, though Mineta saw her from below and exclaimed it was a Panty Shot, so what she's wearing underneath has to be really skimpy.
- Women Are Wiser: While Kouichi is often either trying to control or getting dragged along by Knuckle Duster, Pop is usually the one getting the right info.
A Quirkless vigilante who goes on the prowl for criminals at night.
- '90s Anti-Hero: Fashioned after them and his attitude certainly has underlying theme of this as well.
- Big Damn Heroes:
- Arrives to save Kouichi and Pop Step from a couple of thugs.
- Does it again, saving Kouichi from Stendhal (a.k.a. Stain).
- Badass Normal: Apparently has no Quirks, but comes crashing down from a height that should've hurt him and fights with, well, knuckle dusters. He's also strong enough to send a punk flying into a wall.
- Even when the punks are later juiced up on on Quirk-enhancing drug, he still manages to knock one out via a brick.
- Heck the guy actually manages to go toe-to-toe with Eraserhead, a pro hero.
- Boxing Battler: He fights using fisticuffs augmented by knuckle dusters and is shown training Kouichi with focus pads.
- Blood Knight: Reveals he loves to fight against villains who can actually pose a challenge to him.
- Charles Atlas Superpower: He's a Badass Normal to the point he can overpower a physical Quirk user in sheer brute force.
- The Cowl: Contrasting to All Might's Cape. He has no hero license, which makes him a vigilante in his world's laws, but is more than willing to go out and be a hero after dark, when All Might isn't around and try to inspire others to do the same.
- Loophole Abuse: Once Eraserhead realizes that he's quirkless, he stops fighting him because if he isn't using a Quirk for illegal activities, then he falls outside hero jurisdiction.
- Meaningful Name: Knuckle Duster's main weapons are a pair of knuckle dusters.
- The Mentor: To Kouichi, training him to be a hero outside the laws of their world.
- Only Known by Their Nickname: So far his name has yet to be revealed, with people only calling by his hero name or other nicknames like "old man."
- Red Baron: The Fist Janitor.
- Scars Are Forever: Has a gash on the left side of his face.
- When All You Have Is a Hammer...: He has a pair of knuckle dusters and that's it, and he uses it for everything from fighting criminals to interrogating civilians, much to Kouichi and Pop Step's chagrin. Doesn't stop him from being a badass in any way.
Another vigilante that Crawler and Pop Step meet while chasing down a villain.
- '90s Anti-Hero: Acts as one, mercilessly killing the villains he targets.
- Anti-Hero: Unlike Knuckle Duster, he's not afraid to kill if he has too.
- Charles Atlas Superpower: His quirk isn't why he can pull off all those ninja-like sword techniques. He spent all that time training because Bloodcurdle needs to injure the target first in order to work.
- Dramatic Irony: The first thing he says to Kouichi is that he's a guy who likes to stick his nose where it doesn't belong. Years later he would hear these same words from a hero in training named Midoriya Izuku.
- Establishing Character Moment: Cleaving a bad guy in half. Then, coldly walking away with the man's blood all over him without bothering to wipe it off as he continued to thumb through pictures of people on his hit list.
- Eye Scream: One of his favored tactics is going right for the eyes with his switchblades. Against those with bad reflexes, it works to horrifying effect, but to those experienced in combat, they are able to react in time to avoid having their eyes gouged out.
- Expy: His design has a lot of similarity with Genji from Overwatch. Both are ninjas proficient with throwing weapons and katana, his hair simulating Genji's bandanna, and the similarity in their visor designs.
- Foreshadowing: From his outfit, weapons and hard stances demeanor, it's heavily implied that this is Stain before he reached his Cynicism Catalyst with the hero world. There's good reason for that.
- Knight Templar: Merely associating with a villain, no matter how tenuous, makes you just as bad as a villain, according to him. No mercy will be spared.
- Meaningful Name: The name Stendhal and his real name Chizome Akaguro refers to the colors red and black, he associates these colors as the red of life and the black of death, and strives to sever the gap between the two, meaning that he holds the power of life and death in his hands.
- Ninja: He dresses and fights like one.
- Pay Evil unto Evil: Being a villain is cause enough to be killed, even if said villain has never killed anyone.
- Serial Killer: Although he is a vigilante, he works more like one of these, towards villains.
- Teeth-Clenched Teamwork: He lets Quinn know one day he will come to kill her despite being the source for his information.
Three Storm and Stress Brothers
A trio of sibling perverts whow use their Quirk, Skating, to steal the pants off women.
- All Men Are Perverts: Composed of a muscular, skinny, and fat sibling, who, in that order, flip women's skirts, steal their panties, then put them on. Yeah, it's exactly as gross and creepy as it sounds.
- Poke the Poodle: They're minor in the run of things and only use their powers for perverted purposes, despite talking of being "lone wolfs" and the carnage of society.
- Terrible Trio: Due to be three villains.
A girl revealed to be one of the dealers of the Quirk-Enhancing drug, Trigger. Has the Quirk, Queen Bee, which forms itself as specialize bees with syringes for stingers.
- Achilles' Heel: If as much as a single one of her bees are damaged in capacity, she will be hit with a recoil.
- Bitch in Sheep's Clothing: To most, she's just a rather perky high school girl. In truth, she's completely psycho.
- Blinding Bangs: Which covered over her eyepatch.
- Cute and Psycho: She'd probably get along with Himiko just fine...
- Dragon-in-Chief: To her employer, as she is the one carrying out most of the work. However, it isn't known yet if her employer is really less powerful than her.
- Eyepatch of Power: Wears one on her left eye. It's to keep her bees from getting loose.
- False Reassurance: When she's giving a report of the effects of a drug on a bad guy, her schoolmates overhear her. Quinn says that she has to do a report for her part-time job, which is honestly what she's doing, but conveniently leaves out the illicit nature of her work.
- Flash Step: When one of her clients tries to attack her, she was able to dodge out of the way easily and up a fire escape within a split second.
- The Heavy: While she rarely directly engages in the Trigger incidents instead letting the Trigger users and Stendhal do the fighting while she remains in the sidelines, she is still the direct cause of the majority of them.
- Pest Controller: Her Quirk seems to allow her to control a swarm of special bees that nest behind her eyepatch.
- Punny Name: Hachi is another way of saying "bee" in Japanese and "Quinn" sounds like "queen". So literally "Queen Bee", same name as her Quirk.
- Slasher Smile: During a meeting with one of her clients and avoiding one of his attacks. She sports this while telling her client to go nuts.
- Troll: The majority of other villainous characters really have a hard time putting up with her dry sense of humor.
- Zettai Ryouiki: Wears a striped stocking that goes partway up near her skirt.
The unseen employer of Quinn Hachisuka whose identity is still a mystery.
- Big Bad: The root of the Trigger incidents.
- Diabolical Mastermind: Technically this, due to leading a drug chain and being sought by the police to no avail, as they don't have the slightest idea to the identity of the person they're looking for.
- Mad Scientist: Heavily implied by the dialogues with Quinn.
- The Man Behind the Monsters: Arguably one, given the mutations that the Trigger users often go through.
- Non-Action Big Bad: Has yet to personally step in.
- Psycho Serum: Constantly experiments with new formulas for the Trigger.
- Orcus on His Throne: Operates through leaving the dirty work to the 'Part-time Villain' Quinn Hachisuka.
- The Unfettered: Isn't bothered by the sheer amount of the collateral and mental damage caused by the Trigger one bit.
- The Voice: Yet to be revealed, but regularly has conversations with Quinn on the phone.
- The Worf Effect: Invoked with the decision to exploit the Vigilante's constant interference to see how far the strength of the newer Impromptu Villains has increased, as using official heroes would undoubtedly enable the police to close in on them.
- Xanatos Speed Chess: What's that? The Vigilante are constantly interfering with the experiments? Use them as Jobbers to see if the most recent version of the Trigger empowers the user enough, without having to go out of your way to attract the legal heroes just to measure the strength of the most recent Impromptu Villain.
Samazu Ichimoku & Namimaru Juubei
A couple of middle school students who keep crossing paths with the Vigilantes.
- Expy: Of Cyclops and Wolverine, reimagined as middle-school delinquents.
- Fanboy: Both of them are huge fans of Pop Step.
- Irony: Samazu is a junior classmate to the guy who tormented Kouichi at the start of the manga.
- Sempai Kouhai: They are both the kouhai to Souga.
- Those Two Guys: Always seen together, whether they're fighting each other or just hanging out.
- Younger Than They Look: They're in middle school, but are mistaken for high schoolers at first, and even that looks like a bit of a stretch.
A recurring Impromptu Villain. His Quirk Spikes enables him to create spikes from his body.
- Berserk Button: People laughing at him.
- The Bully: What he is been initially presented as. This wasn't always the case.
- Chekhov's Gunman: Seemingly a minor antagonist at first, but he has a bigger role than initially perceived.
- Foil: Seems to be set up as one for Kouichi. More specifically, as a dark refection of what Kouichi might have become if he were shunned by the society more harshly.
- Hidden Depths: One of his friends says that Souga wanted to become a hero too. He is shown to be rather sensitive to people laughing at him. Flashbacks show that people were constantly writing him off based on his appearance.
- Irony: During his clash against Stendhal, he was so enraged by Quinn mocking him that he starts screaming as he reminisced the many times in the past that he was rejected and ridiculed. As his brief tirade goes on he yells that he is being treated as if he were some monster - almost simultaneously as he is transforming into a porcupine-like appearance.
- Spikes of Villainy: An antagonist with the power to create spikes from his body.
- Spiky Hair: Fittingly enough.