By transferring from Aldera Middle to Yomawari Junior High along with making several big changes to the timeline, Izuku and his friends encounter various new characters in their revised adventures.
Warning: some characters are such walking spoilers that rather than covering pretty much everything in their entries with spoiler tags, their tabs are marked to not open unless you want to be spoiled.
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Main Characters
Aoi Haji
A blue haired girl whose Quirklessness has cursed her with a tragic life and a lonely existence. Though things change for the better after meeting Izuku. She is Quirkless.
- Abusive Parents: Aoi's father is one as he constantly insults her, beats her for petty offenses and guilt trips her for existing just because she's Quirkless. He's eventually revealed to be part of the Meta Liberation Army, and even one of the people behind the twisting of Destro's ideals into a hateful ideology.
- Beware the Nice Ones: She holds a surprising strength for being Quirkless. It is likely all the past abuse she suffered never made her realize it. For that reason she's displayed it only when helping with the cleaning of Takoba Beach, when Eri was about to be abducted, and due to a Quirk who forced her to punch the unfortunate holder.
- Bungled Suicide: In the universe Ronri originates from, a last-second attempt to save her caused her to survive but also be left crippled for life.
- Commonality Connection:
- Izuku forms a sympathetic connection with Aoi as he knows what it's like to grow up Quirkless while being unfairly bullied and terrorized by kids with Quirkist mentalities; in her case, she also has to suffer an abusive father with the same mindset. He ends up developing romantic feelings towards Aoi even if the ones he already has for Ochako stay intact.
- Todoroki unexpectedly finds one with her when she reveals herself to be the fruit of a Quirk Marriage like him, albeit one who has suffered due to having turned out a Quirkless "failure". The knowledge causes him to have second thoughts about his own attitude.
- Driven to Suicide: Aoi decides to take her bully's advice and take a swan dive off of the school roof. Thankfully Izuku shows up to save her. She wasn't so lucky in the original timeline.
- Fangirl: Aoi is a fan of Mirko and a figure of her is one of her few prized possessions. Aoi is in fact the very first person Mirko saved as a Pro Hero, and a twist of fate causes Mirko to save her again during the villain invasion of UA.
- Foil: Aoi is this to Izuku Midoriya. Both are Quirkless children who were tormented for their status, but where Izuku dreamed of being a hero and wound up inheriting One for All, Aoi's dream was to become a writer like her mother, and a comment from the author indicates that she will not be inheriting One for All.
- Happily Adopted: Aoi ends up being adopted by her homeroom teacher Futakuchi after her father's arrest.
- Happily Failed Suicide: Izuku thwarts Aoi's suicide attempt and her life takes a massive improvement.
- Heroic Bystander: Despite having no Quirk or interest in heroism, Aoi gives a good wallop to Kurogiri to keep him from abducting Eri.
- Never Be Hurt Again: Earlier on, Aoi chooses not to get close to anyone, especially Izuku, out of fear they'll get her guard down and torment her for sadistic amusement. Given her Quirkless status and her being a Bully Magnet for Hirikone, this is something that's happened before.
- Refusal of the Call: When Aoi is offered One For All, she rejects the offer on the spot. She doesn't want to be a hero, and the idea of receiving a Quirk scares her after seeing the result of All For One giving one to Ai.
Ai Hirikone (SPOILERS)
A sadistic mean girl known to terrorize her classmates with her family's wealth and her mortifying Quirk, Terror. She's actually Ai Uzumaru, Aoi's childhood friend who was also Quirkless but was forced a Quirk and a personality change by All For One.
- Abusive Parents: Ai's parents are some of the worst examples. Not only they hated that she was born Quirkless, they even hated her having basic human decency. Ai's mother would even use her Torture Quirk to discipline her daughter. It led them to going to All for One to force a Quirk on Ai and have him implant an artificial personality in her to turn her into their desired child. Ai doesn't feel the slightest sorrow for their death.
- Alpha Bitch: Invoked. Hirikone's rich parents placed her at a middle-income school specifically to lord their status over everybody else there.
- An Arm and a Leg: During the villain invasion of UA, as Shigaraki considers her a "loose end" (he's previously killed her parents under orders of All For One), he touches Ai's hand with his Decay quirk. The quick intervention of Class 1-B saves her but at the price of hastily cutting her arm off. She gets it restored by Eri shortly after, though.
- And I Must Scream: Ai was very much conscious the entire time she was not in control of her own body, and had no means to ask for help when the artificial personality controlling her body drove any good person away.
- Bad Powers, Bad People: Hirikone's quirk is called Terror, her mother's Torture. They use them as badly as you can expect from people like them.
- Beware the Nice Ones: Not the Hirikone personality who was never nice of course but Ai exhibits unexpected strength and athletic abilities at the Sports Festival, as Hirikone practiced a lot of gymnastics; she makes good use of that experience to surprise Todoroki while talking him down, helped by him not going all-out with his ice like against Sero originally.
- Character Tic: After living through the experience of having an arm cut and later regenerated, she develops a tendency to grab it often, as if to make sure it's really there.
- Commonality Connection:
- In What If #1, she bonds with Shoto Todoroki over their shared experiences with domestic abuse and they ultimately become a couple. We are merely told that at the end of the one-shot though.
- In the main story their introduction to each other couldn't be worse, as Shoto refuses to use his fire even when it means saving her life, but eventually Ai gives Shoto some much-needed talking that makes him realize the error of his ways, while also revealing her own past to him. From there, they fall in love fairly quickly.
- Dead Alternate Counterpart: See below entry.
- Driven to Suicide: In the original timeline, Ochako came across Ai who had finally managed to free herself. However due to Aoi's suicide, caused by the alternate personality forced upon her, she was succumbing to desperation and about to kill herself... and succeeded.
- Dying as Yourself: In the original timeline Ochako noticed that one of Ai's eyes was of a different color; she herself said she managed to gain "some control" back. The implication is that a further reason to kill herself was not wanting the Hirikone personality to control her body ever again.
- Extreme Omnivore: She likes basically anything that's edible. She recalls that to be her only characteristic the Hirikone personality maintained, sometimes to even bigger levels, much to the chagrin of her parents.
- Flat Character: Hirikone is as one dimensional as a character could get, being a bigoted bully that is untouchable. It is later revealed to be justified, as it turns out it was an artificial personality forced on her by her parents to make her their ideal child.
- Forced to Watch: Ai was fully aware of what her body was doing to Aoi under the influence of the Quirk that All For One forced upon her, and didn't even have the ability to look away.
- Forgiven, but Not Forgotten: While Ochako is willing to forgive Ai for her dark past as Hirikone, she intends to keep her at arms' length until she gets a better understanding of her character. She also states that the kids at their school will most likely not forgive Ai because of her tyranny when she was Hirikone. By the time they graduate from middle school and move to UA, however, she looks to have integrated well into their friend group.
- From Nobody to Nightmare: The ending of Chapter 9 reveals that Hirikone was once Quirkless and also Aoi Haji's best friend. But Ai's parents went to All for One to turn her into a sadistic mean girl with a fear inducing Quirk who ruled her school with an iron fist.
- I Know What You Fear: Another reason why the Alpha Bitch is untouchable is that her Quirk: Terror, allows her to create a hallucinogenic gas that can conjure the greatest fears of anyone who breathes it in.
- Meaningful Rename: Just before she had the quirk forced on her, Ai's parents changed the family name from Uzumaru to Hirikone, also as a way to make Aoi lose track of them. After her parents are killed and she is freed from the Quirk, she reverts back to Uzumaru and doesn't even want to hear that other name.
- Screw the Rules, I Have Connections!: The only reason Hirikone gets away with her abusive behavior and bullying is because she has family members on the school board that can excuse her heinous actions.
- Self-Made Orphan: In the original timeline. After freeing herself from the alternate personality she killed her parents in rage for what they did to her.
- Shipper on Deck: Ai wants Aoi to come up clean with Izuku and Ochako; despite the animosity due to her time as Hirikone, she even manages to enlist Hanako to help. Their plan eventually succeeds, although they are punished for filming the love confessions as they happen.
- Vitriolic Best Buds: After helping Izuku, Ochako and Aoi get together the relationship between Ai and Hanako Yumara develops into this. Later into Act II, however, it becomes clear that Hanako has grown to care strongly about Ai, even considering avenging Ai for the assault she suffers at the Sports Festival.
- White Hair, Black Heart: She has pearl colored hair and the heart of a monster. That is until Izuku uses a Trigger vaccine that reverts Ai back to her kind-hearted self while also turning her hair back to black.
Hanako Yumara
A friendly schoolgirl with a Mutation Quirk that gives her the appearance and powers of a spider. Behind her bubbly appearance lie many concerning issues. Her Quirk is Phoneutrianote , or simply Spider.
- Achievements in Ignorance: In Side Stories #3 she meets the Aka Manto, a spirit who offers two different toilet paper rolls and kills if one makes a choice. Also because in the age of quirks knowledge of youkai and old urban legends is mostly forgotten, she's so perlexed she answers that either is fine, which is incidentally a way to make Aka Manto leave without damage.
- Berserk Button: Mutant racism and homophobia due to her past history. However the biggest button is insulting the memory of her father, which can turn the already unstable Hanako murderous. Another one is seeing Quirks that remind her of the Quirk of the bully she killed; seeing Tetsutetsu triggers a full-on psychotic break in her, and she later attacks Kirishima viciously (though also to protect Stain).
- In the original timeline she stopped caring about mutants, and killed many, after Cthylla was killed by some of them.
- Beware the Nice Ones: The spider-mutant with a bubbly personality hides a very troubled past and a dark side; she can kill people and also dispose of their bodies easily, when she decides to use the abilities given by her Quirk fully. Her physical strength is also much higher than it seems.
- Blood-Splattered Innocents: Happens to Hanako twice in a Side Story. The first time is when her father was killed by a Hero, his blood splattering on her as she came just one moment later. The second time is a subversion as an older Hanako snapped and killed her bully, dismembering her in a shower of blood.
- Butt-Monkey: Several scenes paint her as this among her group of friends, as she has a tendency to end up in ridiculous situations. A very stark contrast with her dark side.
- Childhood Friends: She and Cthylla have known each other their whole life.
- Cute Monster Girl: She has several spider characteristics as an effect of her mutation Quirk.
- Dark and Troubled Past: Her origins are quite tragic, as described within the spin-offs. Behind her bubbly personality there's a victim of racism against mutants that also claimed his father's life, by the hand of a Hero no less, with also some homophobia thrown in; she's been a fan of Stain since the latter killed her father's killer, and the bullying got so bad she snapped and killed her bullies. And the changes in the timeline, rather than preventing her original fate, have pushed her in even darker directions as Stain's sidekick, even if that is ultimately short-lived.
- Deliberate Under-Performance: Despite her genius-level intellect, Drakengard School constantly tampered with her results (as typical of MLA schools) to the point she ultimately resigned to that and started doing mistakes voluntarily. It became so ingrained in her, she kept doing that even through middle school at Yomawari, everyone believing she had only passable grades. She finally uses her full intelligence to enter Umineko Academy.
- Despair Event Horizon: In the original timeline, the tragic death of Cthylla was the last straw for Hanako's sanity, already proven by the equally tragic loss of her mother, and prompted her to go on a spree killing of mutants.
- Dreadful Musician: Her singing is so terrible it causes some of her friends to go temporarily deaf and their entire group to be banned from a karaoke bar.
- Expy: Invoked with Hanako, who on her first appearance is stated to remind Izuku of Mina Ashido due to her attitude and bubbly personality. Just like Mina, she also shows interest in gossip and romance. Amusingly, the two look to be even attracted to each other upon meeting. However Hanako has a Dark and Troubled Past past and many unresolved issues.
- Extra Eyes: She has eight red eyes on her face.
- Forced Out of the Closet: She came out as lesbian privately to Cthylla but a bully overheard and quickly made it public, causing homophobia to be added to the bullying.
- Monster Fangirl: She loves Stain for killing the Hero who murdered her father just because his Quirk made him look villainous. In the new timeline she ultimately seeks to find and join Stain, and succeeds. Such partnership however unravels as soon as she realizes Stain's beliefs are so extreme they become quirkist.
- Projectile Webbing: She can shoot webs from her hands that can capture or secure anything. But also razor-sharp threads that can easily cause serious property damage and tear people to pieces.
- Sanity Slippage:
- It becomes increasingly clear that she's been barely holding up for years, and a further breaking point comes when she learns the Hero who killed her father did in fact voluntarily murder him; she kills the girl who mocks her with that knowledge, and treats it as an annoyance afterwards. Gets even worse when she first sees Tetsutetsu's Quirk, which reminds her of Mira Akotone, and later meets Death Arms, triggering a breakdown that causes her to kill Death Arms - with Stain watching. She then joins Stain.
- In the original timeline, she's been completely broken by losing both her mother and Cthylla in events following the breakouts from Tartarus and other prisons; there's likely an element of guilt as they both died while they were looking for her.
- Shipper on Deck: Her interest in romance and gossip is such that she accepts to help Ai with her plan despite the past animosity.
- Vitriolic Best Buds: After helping Izuku, Ochako and Aoi get together the relationship between Hanako and Ai Uzumaru develops into this. By Act II however it becomes clear she's grown to greatly care about her as well.
Cthylla Ryuu
A reserved and soft spoken goth with a Lovecraftian image. She hopes to excel in the Business Course of Yuuei so she can open her own bookstore. Her Quirk is Deep One.
- Beware the Nice Ones: In an emergency situation, even Chtylla proves to be this. Her Deep One Quirk allows her to extend several tentacles that make short work of a group of the villains invading UA, and then she gives a large gator-like villain a run for her money, ultimately defeating her.
- But Not Too Foreign: Her father is American but she was born and raised in Asahi, and shows no signs of a special influence of her mixed ancestry; in fact it takes Chapter 40 to just know this to begin with.
- Childhood Friends: She and Hanako have known each other their whole life. She is however apparently unaware of Hanako's many dark secrets.
- Cthulhumanoid: While she's got tentacles for hair and arms rather than mouth, she fits the trope as her name and Quirk are clearly inspired by Lovecraftian mythos. Made even more evident by her father, who has the mouth tentacles and whose name is Cthulhu.
- Dead Alternate Counterpart: In the original timeline, she ended up killed by mutants loyal to Spinner. It caused Hanako to lose any sanity she had left.
- Good Thing You Can Heal: Cthylla voluntarily sacrifices one of her tentacle arms against Rika Hyoto to make the villain ingest her toxic blood, knowing it will regenerate.
- Missing Mom: Her mother died of complications after giving birth.
- Poisonous Person: Her blood has paralytic properties and her tentacles are equipped with spikes to inject it. When she confronts Rika, she lets a (regenerating) tentacle arm to be bitten off to release a larger quantity.
- Tentacle Hair
- Unaffected by Spice: She is seen calmly eating sushi with ghost pepper
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Ronri (SPOILERS)
First showing up in Side Stories and soon after in the main story. A mysterious, whimsical little girl known to travel across dimensions. She holds tremendous power and she acts based on the interests of her treasured Izuku. Her original Quirk is Spatial Manipulation but she also possesses All For One and a huge stock of Quirks. As revealed in chapter 45, she is actually another version of Eri; the Ronri: Origins spin-off gives more detail on how she became what she is now, including that she possesses her own copy of One For All.
- Alternate Self:
- Eventually revealed to be the Eri of her home universe, born with a different quirk. She even spends a little time with the "original" at the Sports Festival, and later after revealing herself to Izuku, she stays at UA as well and looks like an older sister of Eri.
- She has a closer alternate from an universe where her base quirk and starting circumstances were the same, the main difference that Dr. Garaki was successful in having All For One's Vestige take over after he implanted the Quirk in her body.
- Because You Were Nice to Me: The reason she's so dedicated to Izuku is because, in her original universe, he gave her hope to live a better life when no one else was able to, and he lost his life to protect her. It's implied it was the same with some iterations of Nejire and Toga she met, so she also saves versions of Toga who went villainous. Her moral compass is however so erratic, she may easily turn against them too.
- Blue-and-Orange Morality: Ronri's entire moral compass is based solely off Izuku's well-being. Nothing else matters to her, and should anyone wrong Izuku, they better pray she doesn't come to their universe. It doesn't even matter if they actually did wrong Izuku either, only if she considers them responsible. Prime example being the setting of Deep Dive #1, where she slaughters a lot of the cast for Izuku being Driven to Suicide, despite only few of them being actually responsible for it; Mina is spared because she actually stood up for Izuku, yet Ronri still considers killing her for a long moment.
- Canon Character All Along: Originally presented as a new character, The Reveal in chapter 45 actually shows her to be a version of Eri who was experimented on by All for One and Dr. Garaki, the latter forcing the AFO Quirk on her in an attempt to revive his master through the Quirk's Vestige.
- Creepy Child: The way she appears and addresses some characters as she knows their secrets, her massive mood swings that betray her unstable mind, the tremendous level of power she holds, her split personality, the lengths she's open to reach, up to mass murder, for Izuku's sake - beside Izuku and a few others (and even that is subject to change, depending on her mood) no one is safe from her, as her rampage in Deep Dive #1 demonstrates - make her this.
- Her Alternate Self is this even more, as it's all For One in a child's body - with his trademark smirk.
- Dimensional Traveler: Able to move between timelines, she's visited several and has seen many alternate fates of characters.
- Evil Counterpart: While Ronri can hardly be considered "good", the second chapter reveals there's a version of her taken over by All For One's consciousness.
- Hero Killer: In Side Stories #6, Ronri is revealed to have murdered an alternate universe's Class 1-A, the HPSC, and many Pro Heroes she believed responsible for Izuku's imprisonment and suicide. Deep Dive #1 adds that she also killed All For One and all strongest villains except Toga, while sparing Mina (the only one who stood up for Izuku) and Nejire. Due to the many Quirks she has, it's clearly implied she killed Heroes in other universes as well.
- Horned Humanoid: She wears a bonnet to cover a small horn on the left side of her forehead, hiding her true identity as Eri. The canon Eri has the horn on the right side, to further mark Ronri as her but also not quite the same.
- Hypocrite:
- She cares about Toga getting mental help, and calls out Dr. Kojima for giving up on Hanako too early, while clearly needing help herself and refusing it.
- She claims doing what she does for Izuku's sake, despite clearly not wanting to listen even to him when he has reservations, and is ready to call an Izuku variant "defective" if he openly contests her methods and "dares" defy her supposed protection.
- She hates being compared to All For One, the man who caused her to be what she is firsthand, but is ready to act like him when she deems it necessary, like destroying a city with a smile on her face just to make a point of her strength to Izuku.
- Insane Troll Logic: Played for Drama.
- If something happens to Izuku, regardless of whether or not they were actually involved in what happened, she will proceed to massacre anyone she holds responsible for what happened, and has done so across who knows how many worlds.
- She's ready to excuse any wrong or outright evil action of an Izuku variant, as long as they don't involve the correspondent Eri directly.
- Due to her own experiences and trauma, Ronri holds hardly changing opinions on some characters. She wants any villainous version of Toga she meets to be rehabilitated but almost gleefully dismisses her crimes, while she can't accept that some people she hates can also have good qualities, evident as how being faced by a good, sincerely apologetic All Might is enough to cause her a mental breakdown.
- Said breakdown reveals she has a split personality, with a side that while not outright evil, is quite prone to violence and to falling for that logic more easily.
- Noodle Incident: While it's clear why she is so obsessed with Izuku, it's currently unknown how Ronri's special affection for Nejire came to be; even Ronri: Origins is quite vague about her. The Toga of her home universe went through a Heel–Face Turn that helped creating a good first impression. Ochako was instead long dead by the time Izuku rescued Ronri, and for this reason she isn't among the people Ronri cares for the most, despite her typically being romantically involved with both Izuku and Aoi in numerous iterations of the multiverse; Ronri has no issue goading Ochako into killing herself in Deep Dive #1 but she seems fine with the polycule still happening in What If #1. Her care for Katsuma is due to having a crush on him. The Aoi of her home universe survived her suicide attempt but at the price of permanent injuries, and Ronri bonded with her. As for Eri, the sixth and last person of her short list, it's simply because she's herself.
- Person of Mass Destruction: She's got more than enough power to single-handedly cause large-scale damage, as evidenced in Deep Dive #1 where she easily destroys the main building of UA, while in Chapter 89 she casually destroys a city just to spite Izuku.
- Pint-Sized Powerhouse: This little girl has got All For One (the Quirk) and many Quirks even the original AFO (the man) doesn't possess, like one that allows her to be undetected by security systems and even Ragdoll's Search, adding to her original Spatial Manipulation which has evolved into an ability to travel between universes. Deep Dive #1 has her single-handedly offing most of the cast in another timeline using insane numbers and combinations of Quirks, she's seen pinning the USJ Nomu down, and wipes out a police squad casually. She's also the holder of her universe's One For All; while she can't voluntarily activate it due to her trauma, it seems to passively power up other Quiks.
- Power Parasite: Due to a fumble by Dr. Garaki, Ronri got a "base" version of All For One with no extra Quirks. It hasn't stopped her from stealing a lot of Quirks from anyone unfortunate enough to cross her path, across many universes, so that she also possesses several from the main cast. Her huge arsenal includes Overhaul, Hellflame, Blue Flame, Half-Cold Half-Hot, Pliabody, Search, Erasure and Decay. She also takes Nejire's Vestige and Quirk away from Izuku's One For All.
- Rage Breaking Point: Do not compare her to All For One. She hates being considered the same as him because his quirk was forced on her; the All Might of her home universe wanted her imprisoned in Tartarus for that reason. The existence of a version of Ronri actually controlled by AFO's consciousness, as eventually revealed, likely fuels her anger.
- Roaring Rampage of Revenge: In an Alternate Universe Ronri killed the HPSC, many heroes and Class 1-A (except Mina) because they all turned their backs on Izuku which led to his suicide. She also wiped out Tartarus and the League of Villains, including All For One, sparing only Toga.
- Set Right What Once Went Wrong: What If #1 is revealed at the end to be basically an experiment by Ronri to create a happier timeline. Her influence on the events of the second chapter of the spin-off is also clear.
- Split Personality: The guilt over her own actions has caused her mind to split into a compassionate, caring personality and a darker, violent one. They are later merged back into one.
- Super Power Lottery: Having All For One has allowed her to obtain multiple powers at her disposal, much more than the original holder has ever had.
- De-power: With Aizawa's Erasure Quirk, she can neutralize any emitter Quirk.
- Laser-Guided Amnesia: She has the power to alter and erase memories as needed.
- Thinking Up Portals: She can get in and out of a scene by materializing one; she can use the same ability on other people, like when she sends Moonfish directly to Tartarus.
- No Body Left Behind: Ronri can obliterate a person into nothingness if she chooses to, even without using the copy of Decay she's got.
- Reality Warper: Her original Quirk is Spatial Manipulation which allows her to manipulate the fabric of space and reality.
- Supering in Your Sleep: In Rehabilitation #4, despite Ronri being deeply asleep and ill at the moment, her Search Quirk detects this universe's version of the Quirk specialist who tipped off Dr. Garaki and All For One about her, kickstarting her misfortunes, and Spatial Manipulation violently twists his neck. She isn't even aware of having killed him, stopping him before he could tell Garaki about Toga's Quirk Evolution.
- The Watcher: While she actively intervenes in regard of the few people she truly cares for, with people she doesn't like as much she often just observes how their life goes from timeline to timeline. Glimpses on her adventures in other universes show that sometimes she'd instead subvert this, making herself known to Izuku and his allies and helping them in the open. In the main story, she openly reveals herself after the new Hosu arc.
- There's No Kill like Overkill: She often takes advantage of the sheer number of Quirks she holds, using several at once with more strength than is really necessary. For example she can create purple flames by using the Quirks of Shoto, Endeavor and Dabi plus a gas control Quirk - instant incineration.
- Wild Card: Ronri describes her role as being this, her only constant being her devotion towards Izuku. It's that very reason why it's unclear what role she has in the greater narrative, and if she's meant to be an ally, or another threat. She eventually pivots strongly towards the latter.Ronri: I don't consider myself a villain. I don't consider myself a hero. I'm not even NEUTRAL. I simply play whatever role I need to in that timeline, all for Izuku's sake.
- Wise Beyond Their Years: Despite effectively acting like a child at times (like when she subjects Endeavor to many pranks), she displays a level of maturity and knowledge, and of implied experience, you wouldn't expect from a girl declaring to be eight years old. It's eventually revealed it's partly due to her having stolen the High Specs Quirk from a variant of Principal Nedzu. And given for how long she's been traveling through the Multiverse, she may also possess some anti-aging quirks in her large stockpile, so she may not even be a child by all means.
- Woobie, Destroyer of Worlds: A little girl who has suffered too much in her short life and wants to use the power she ended up possessing to help the few people she truly cares for. Also a mentally unstable person with enough power to effectively destroy a world, and open to go to extreme lengths for the sake of those few people.
- Yandere: She can be seen as this, given how she went on a murderous rampage to avenge Izuku's suicide in an alternate universe, is shown to have committed an even bigger massacre elsewhere in front of a living Izuku (and is implied to have done thatin further universes), and how she slaughters Tsukauchi's squad over a simple tantrum. She even boasts that she'll take on any role or perform whatever deed if it's for the benefit of Izuku, whom she considers incapable of doing any wrong, even after witnessing villainous versions of him.
- After learning of her existence, Aizawa outright defines her a "Psycho Yandere".
Secondary Characters
Futakuchi-Sensei
Izuku's new homeroom teacher at Yomawari Junior High, known for her warm personality. Her Quirk is Second Mouth.
- Cool Teacher: One of Izuku's best teachers as she maintains order in her class and tries to look out for her students.
- Parental Substitute: She becomes Aoi's foster mother after her abusive father is arrested. Even in What If #1, despite Aoi being freed from her father several years earlier.
- Too Many Mouths: She has an extra large mouth in the back of her head. Befitting as her name and Quirk are based on the Futakuchi-onna of Japanese folklore.
Amura Yatsuboshi
A classmate of Izuku and Katsuki at Aldera Middle School. Later admitted into the General Education course at UA, becoming a classmate of Aoi. Her Quirk is unknown but likely related to her hair.
- Adaptation Expansion: In canon, she exists only as a background character in the third episode of the anime: a silver-haired girl in Izuku's middle school classroom, notable for smiling softly rather than showing the openly derisory attitude most other classmates hold towards him. The fanfic gives her a name and tells she was in fact friendly but also afraid of ending up bullied like Izuku if she ever got close to him.
- Anime Hair: She's got a long mane of silver hair that characteristically stands up straight on its own, as a likely result of her Quirk.
- Fangirl: A fan of Eraserhead, which causes her to notice and approach him when he patrols around Aldera to check on Bakugo, asking for an autograph. He uses that as a chance to make her talk to the police about her school.
- Small Role, Big Impact: Her testimony about Aldera School's practices proves pivotal in the investigation against them, leading to the shutdown of it and other MLA-affiliated schools, in turn following into the operation to dismantle the MLA.
- Token Good Teammate: Among her classmates at Aldera. Even if she didn't befriend Izuku due to fear of ending up bullied, she didn't participate in the forced displays of hate and derision against him either, and also refused to use the derogatory "Deku" nickname. Izuku has a positive memory of her, and he's happy to learn she's become an UA student.
Rina and Hina Horimoto
Twin sisters who attend the same middle school as Izuku and Ochako. Their Quirks are Honest Truth and Compulsive Liar respectively.
- Blessed with Suck:
- The Quirk of Hina can sound funny but it literally forces her to never say the truth, to the point she's often been taken to a police department because she admitted to crimes she had no part in.
- While not as bad, Rina's Quirk means she can't even lie to protect someone, or keep a secret.
- Sibling Yin-Yang: Quirk-wise, Rina Cannot Tell a Lie, while Hina is a Compulsive Liar.
Ume Ruta
A woman appearing in the Rehabilitation spin-off, a patient at the same mental health clinic as Toga. She is quickly revealed to be related to a canon character.
- Adaptation Expansion: In canon, she exists only in a couple flashback narrations, explaining how Eri ultimately ended up in the hands of Overhaul. The fanfic gives her a name and tells she feels so much regret over her past actions, it drove her insane.
- Dead Alternate Counterpart: In the universe Ronri (who is an alternate Eri) comes from, she was killed by Shigaraki to not leave witnesses as he and Kurogiri kidnapped Eri.
- Intergenerational Friendship: She befriends fellow patient Himiko Toga and tells her why she ended up in the clinic.
- My God, What Have I Done?: The very reason she's a mental patient, as the realization of her actions broke her. Even worse when Eri appeared on TV when the news copter filmed the last minutes of the fight against Overhaul, allowing Ume to see the state she was reduced to, followed by the police coming to question Ume.
- Parental Neglect: The tragic, abrupt way she lost her husband drove her to hate her daughter Eri and leave the little girl to her Yakuza grandfather. She regrets that immensely, especially after knowing what happened afterwards.
Nana and Aya Mochizuki
Twin sisters attending UA in General Education and Support respectively. They both have Cat Quirks but with profoundly different effects on their respective physiologies and powers.
- Brutal Honesty: In her first appearance, Nana tells to a classmate with a really poor Quirknote that it just sucks.
- Cat Girl: Although only Aya looks like the usual stereotype.
- The Jinx: Nana's Black Cat Quirk gives her the ability to curse people with thirteen hours of bad luck if she bites them.
- No Sense of Personal Space: How Aya acts towards Izuku after the first meeting of class representatives, flirting with him and forcing a paper with her phone number on him twice.
- Polar Opposite Twins: Not just in their personalities but even in the looks, despite being twins. They both have a Cat Quirk but Nana is so heavily mutated, many wonder if she isn't rather a cat with an intelligence Quirk; on the other hand Aya is a classic Cat Girl who looks human beside the tail and ears, plus cat-like agility and reflexes. The only thing they seem to have in common is an ability to be trusted by their classmates, as they are both representatives of their respective classes.
- The Unfavorite: How Nana feels in relation to her sister. Implied to be due to her being more mutated by her quirk compared to Aya but it may also be related to academic achievements.
Gallant Blade (SPOILERS)
A Pro Hero active in the past. His actions deeply affected another character.
- Asshole Victim: Went on to become one of the first heroes killed by Stain.
- Bigot with a Badge: Racist towards mutants, he looked for excuses to "purge" them. Like when he murdered Hanako's father, making it pass like he mistook him for an accomplice of two mutants who had just committed a robbery.
- Even Evil Has Standards: Not a high bar to clear but it seems that at least he wouldn't kill children, or in their presence. He didn't realize Hanako was nearby until after he struck the fatal blow to her father; in an Alternate Timeline, her coming a few instants earlier causes him to stop, even if he seethes over that.
- Everyone Calls Him "Barkeep": Only his hero name is known.
- Laser-Guided Karma: If there was someone deserving to be branded a fake hero and fall to the Hero Killer, it was him.
- Screw the Rules, I Have Connections!: Due to capable lawyers and the cover of the HPSC, he was acquitted from any accusation and the killing of Mr. Yumara was classified as an accident. The lawyers were either on his same page or incredibly amoral, as they knew he was in fact a murderer.
- Small Role, Big Impact: His heinous action marked the daughter of his victim forever in many timelines, condemning her to fates ranging from a miserable existence to becoming a villain, with also consequences for many other people close to her. In fact a much happier timeline happens when he's prevented from killing Mr. Yumara, as shown in What If #1.
- Villain with Good Publicity: He was basically this.
Kirijo Shinato
A student at Yomawari Middle School. His Quirk is Premonition.
- Blessed with Suck: His quirk allows him to see someone's death and the details of it, like the date and circumstances. Beside the general unpleasantness of such an ability, he's never managed to prevent any death he foresaw, until the day Izuku saves Aoi.
- Only One Name: For a long time, his first name is unknown. It's finally revealed in Chapter 88.
- Perpetual Frowner: Not without reason given how much his Quirk has conditioned his life and personality.
- Ripple-Effect-Proof Memory: A curious case with his Quirk (and just the Quirk, not Shinato himself), as it doesn't merely predict someone's death but it seems to look into a "prime" timeline. While him not seeing Aoi's suicide attempt failing is easily explainable with Izuku, not present there in the original timeline, saving her literally at the last second, in the timeline of What If #1 Shinato still sees Aoi dying during the third year of middle school, despite her being much better off than in the main story, never even considering to kill herself to begin with, and living a happy life afterwards. Later, he is also convinced that contrarily to Aoi, Eri's death can't be avoided but is fortunately proven wrong again.
- You Can't Fight Fate: His quirk has made him grow very jaded and fatalistic, especially after his attempts to save his little brother ended up causing his death. So much than when Izuku saves Aoi, he says it's an "anomaly" rather than be happy. Even when he foresees Eri's death he keeps it to himself rather than tell Izuku, which is also hard to blame given Izuku's reaction when he told him he knew when Aoi was supposed to die.
Dr. Ryuto Kojima
A psychiatrist at a mental health clinic who takes Himiko Toga, and later other characters, under his care. He is Quirkless. Later revealed to possess a quirk he keeps secret.
- Cruel to Be Kind: He doesn't miss telling Toga that she involuntarily caused the death of one girl, so that she can confront her guilt over that, and heal from there. As some months later Toga is seen to be allowed more freedom to go around the clinic, and later she can even to go out of the premises supervised for a while, he's been successful.
- Hive Mind: His quirk Hive Memory allows him to share memories of his choosing with other versions of himself throughout the Multiverse.
- My Greatest Failure: He feels this way about a past patient whose case he didn't take seriously enough, fearing that person may take a dark path in the future. As the patient turns out to be Hanako Yumara, he's unfortunately right. Ronri even calls him out on having given up too early on Hanako, as her joining Stain makes Kojima even more skeptical she can be saved.
- Only One Name: His first name is not known for a long while. It's eventually revealed at the end of Ronri: Origins.
- Secret-Keeper: Thanks to his Quirk he's very knowledgeable about the Multiverse; he even knows Ronri (and tries to reach out to her, if unsuccessfully), as she's become used to seeking iterations of him for information every time she visits a new universe. He also shelters her after her mental breakdown in Chapter 46. He trust Toga with that knowledge, although it may be part of a bigger plan he has.
- The Watcher: His Quirk gives him insight into the Multiverse. While apparently mostly passive (also due to the interest he'd raise if his Quirk was known), there are hints he's trying to influence events discreetly.
- They Would Cut You Up: The reason he is officially registered and known as a Quirkless man. His parents quickly realized that the HPSC would come for him, were the existence and the implications of his Quirk ever known.
- We Used to Be Friends: Kojima had a falling out with a colleague at the same clinic, Dr. Konami, due to differences in their methods. There are even implications that Konami is going as far as attempting to sabotage him now, as Konami decides to bring Saito, the victim of Toga's very first assault at the time she lost control, at the clinic. When the two bump into each other at the clinic, it ends as well as you can imagine.
Ona "Ninetails" Ayumi (SPOILERS)
Great Britain's Number One Hero, a Japanese woman who moved there and quickly climbed the ranks. She's secretly a Kunoichi and her background is one of the causes she and her family left Japan. Her Quirk is Phantom Limbs.
- Combat Tentacles: Her Quirk can be considered this, even if it rather looks like multiple tails, reason for why Ona chose that specific Hero Name. While the similarity is unintended on part of the author, it reminds a lot of the Vectors from Elfen Lied.
- Defector from Decadence: Even if with some doubts, Ona spent most of her life following the ways her Shinobi Clan adopted to survive in the Age of Quirks, including being trained to kill in very harsh ways that claimed the lives of two siblings, marrying and having a kid very early, and accepting to get other husbands and offspring in the future. When her grandfather and clan leader pushed her to accept the HPSC's offer to sell her daughter off to them, however, she couldn't take it anymore and left Japan.
- Early-Bird Cameo: Not of herself but her Quirk: Phantom Limbs was one of the many Quirks used by Ronri during her rampage in Deep Dive #1. After Ona was properly introduced,
the author confirmed that Ronri took in fact the Quirk from a variant of her who didn't go down without a good fight. - Expy: A vague one of Tengen Uzui, even if she ultimately ends up having a single spouse. Several of her siblings have names taken from Demon Slayer, including a brother named Tengen.
-
Germans Love David Hasselhoff: A Japanese Pro Heroine who's got big in the UK despite being a foreigner - her Hero name also implies a theme inspired by Japanese folklore - ultimately becoming the country's Top Hero and the youngest Number One Hero in the world. - Human-Demon Hybrid: According to a legend one of the ancestors of Ona's clan, which is very ancient, produced offspring with a demon as part of a pact, and demon blood flows in the family since. While of course impossible to prove, it's used as explanation for why many members, including Ona, have sported characteristic red eyes well before the advent of Quirks.
- Mama Bear: After accepting the ways of her clan for a long time, she decided to defy them - even if some of her relatives support her - and leave Japan to protect her little daughter Ara. When Ara is kidnapped in the present, she is so furious she basically scares British Police and Heroes into using all their resources to help her find the kid.
- Massive Numbered Siblings: She's the eight of ten children, although not all from the same mother as her father has in fact three wives; the clan practices polygamy to compensate for their dwindling numbers.
- My Secret Pregnancy: In What If #2, Ona stumbles into a younger Bakugo bullying Izuku and Aoi while shopping. Later, she tries to hide her bag full of baby toys in embarassment, clearly implying she doesn't want others to deduce she's pregnant.
- Ninja: Her Shinobi Clan has survived well into the Age of Quirks, albeit not without difficulties, and while part of them keep the traditional line of work of hired assassins, others operate legally as Pro Heroes, with rare overlap. Deep Dive #8 features a brother of Ona who's got a position in the Ministry of Education, and a sister in the MLA is mentioned, while Side Stories #9 introduces a niece who's an idol, further showing the clan establishing a foothold in various places (also to cover their own activities), and having knowledge and contacts in the underworld.
- Perfectly Arranged Marriage: With her husband Kit, who comes from a Yakuza clan. They had to marry each other very early with the intention of producing offspring to strengthen her clan (and there were plans for Ona to get more husbands in the future) but they sincerely love each other and their daughter Ara. Kit has been fully on board with leaving Japan for the UK to protect Ara.
- Secret-Keeper: She knows some unsavory details about the HPSC through her grandfather and her own direct experience with them. She also possesses some classified files of the HPSC procured by one of her employees, a capable hacker, but waits for the day the strength and influence of the Commission wanes to use them.
- Small Role, Big Impact:
- She met Lady Nagant only briefly but, as women trained to be assassins and originally thinking they had no choice, they found a connection. It's implied that Ona therefore gave Nagant an indirect final push to confront the HPSC president and end up in Tartarus. The encounter left a mark on Ona as well, as years later the memory of Nagant pushed Ona to rebel to her grandfather when asked to forfeit Ara to the HPSC.
- In the timeline of What If #2, her stumbling into a younger Bakugo as he's bullying Izuku and Aoi makes so that Bakugo's attitude and Aldera's practices are exposed and serious measures are taken about the explosive boy, as he's pulled out of Izuku's life and returns into it years later as a much better person.
- Training from Hell: She had to undergo a very hard training from age 4. She lost a brother to an accident, while a sister died because her body couldn't simply take the training regimen anymore.
