(cw: non-graphic mentions of shounen-typical violence, child abuse, family annihilation, and loss of bodily autonomy; backstory spoilers.)

tl;dr. Shigaraki Tomura is the main villain and antagonist in the world of My Hero Academia, where 80% of the human population has developed superpowers called Quirks. In order to deal with a superpowered citizenry, world governments developed a system of legalized, professional heroism to combat superpowered crime. Tomura was raised to be the successor of All For One, the man who could be considered the ruler of the underworld before he was defeated and weakened by his arch-nemesis and Japan's #1 hero.

Born Shimura Tenko, Tomura inherited the troubled history of his father's family. His mother (Tomura's grandmother) left her son with an adoptive family when he was young, out of fear that her job as a hero would put him in danger. Tomura's father came to hate heroes, and whenever Tenko expressed his childish wishes to one day become a hero, he would be harshly rebuked. This all came to a head when Tomura's elder sister snuck them into their father's study to show them a photograph of their grandmother; when their father found out, he harshly slapped Tenko. Despairing and heartbroken that no one in his family ever defended him, Tenko became overwhelmed with rage and hate, awakening his Quirk, Decay. Decay spread from him and all that he touched, annihilating his family members, with the final one being his father, whom Tenko deliberately touched in a fit of rage.

Tenko, no longer having a home nor knowing what to do, wandered the streets. His spirit was further crushed when no one, civilian nor hero, came to his aid. The only person who held out a hand to him was All For One, the ruler of the underworld, as well as the villain responsible for his deceased grandmother's murder. He became Shigaraki Tomura, pressed by AFO to give into his violent instincts, to kill, and to seek the destruction of hero society.

At Tomura's canon point, he's already struck out on his own and gathered his own merry little band of misfit villains to try and overthrow the heroes. The relationship of the League of Villains is curious: they gathered together initially because their goals and desires converged, but since then, they've grown closer to one another. For some members, the LOV is their only source of support and friendship, and the only place they can call home. Tomura's feelings towards his allies are left much more ambiguous, but what can definitively be said is that he comes into his own as their leader, and they are his impetus to start forming an identity of his own outside of All For One.

It seemed all to be for naught. In Tomura's search for a greater power that would enable him to defeat the heroes, he undergoes a surgery to obtain a copy of AFO's Quirk. However, this contained a backdoor which allowed AFO to slowly overtake his consciousness. At Tomura's canon point, his consciousness and AFO's are in a power struggle, presenting to the outside world as a single, but unstable, identity. For the purposes of the game, I'm opting to play Tomura as fully himself, without the interference of AFO.

Visually, Tomura has weathered, wrinkled skin around his eyes and lips, attributed to childhood skin problems. He has a vertical scar over his left eye and one over the right corner of his lips, while he has a beauty mark on the left side of his chin. He tends to hold things with three or four fingers of his right hand, and on his left hand he is missing his thumb, index, and middle fingers, an injury which he covers with some kind of glove. He has holes in the palms of his hands that seem to just be an empty void. His suit mark is a simple heart with a blood red outline on his tongue that fills up in color as a countdown to activation.

▶ BACKTAGGING.
▷ Yes please. I usually hit back action threads a couple times to once a week.
▶ THREADJACKING.
▷ Yes on lighthearted, public texting threads! Otherwise ask first please.
▶ FOURTHWALLING.
▷ Nah.
▶ OFF-LIMITS.
▷ No graphic descriptions of sexual violence—this includes stuff that would be considered statutory rape IRL, thanks (mentions of it in character background and worldbuilding are fine), and no IRL racism (fantasy racism is fine).
▶ SHIPPING.
▷ Yes.
▶ TAG STYLE.
▷ Brackets preferred, but I can also do prose!
▶ OTHER.
▷ Tomura in general is a pretty violent character who has a lot of blood on his hands, who is also on the receiving end of a lot of violence. Gore is often not the point, but there is a lot of it. His story also deals with child abuse, family annihilation, and (non-sexual) grooming. Feel free to use my opt-out.

▶ HUGGING.
▷ With close CR, he will take it. If not, you'll be pushed away and told to get lost.
▶ KISSING.
▷ If the circumstances call for it.
▶ FLIRTING.
▷ He doesn't flirt (which can change); people with closer CR might have more success.
▶ ROMANCE.
▷ With a lot of development.
▶ FIGHTING.
▷ Happy to.
▶ INJURY.
▷ Happy to!
▶ DEATH.
▷ Maybe, if there's a good plot to be had. He's hard to kill though.
▶ PHYSICAL MANIPULATION.
▷ Throwing him around is fine, controlling his movements might need some negotiation.
▶ MENTAL MANIPULATION.
▷ Maybe, but his mental willpower is pretty strong and I'd like to discuss it first.
▶ MAGICAL.
▷ He has no magical capabilities to speak of. Characters who are sensitive to bad vibes even in regular humans are welcome to detect his bloody history; they may be able to sense the vestiges of the stolen Quirks he harbors. Tl;dr: vestiges are the impressions of a Quirk's original owner which reside in a kind of spiritual/mental landscape within the Quirks of AFO/OFA, and apparently only within those two specific Quirks, so. IDK. IDK what kind of worldbuilding this is but you can detect it if you want.

Decay is Tomura's own Quirk, one that he was supposedly born with, and this allows him to "decay" anything he touches with his hands. This essentially means that what he's touching will crack apart and crumble away to dust, whether it's living, organic matter or inorganic. Tomura is able to control how far and deep the decay spreads, and if he wants, decay can be spread to multiple targets as long as there's a point of contact for its effects to travel from one to another. For example, it can travel through the ground and hit people who are standing in its area of effect; likewise, someone who chops off an affected limb can prevent Decay from reaching the rest of their body. At this canon point, Decay is very powerful and was shown to be capable of leveling a small city.

For the purposes of the game, I'm willing to have Decay be restrained by the resort: I'd like it if he could still affect fairly large structures (walls, doors, etc.) but perhaps have it unable to progress more than a few meters. I'm also cool with it if the resort would like to shut it off completely in certain locations or circumstances, so that there are places and things he can't Decay at all. I'd also like to have it still affect living beings, with player permission if it involves a PC of course.

The other Quirk he obtained through surgery is All For One, a copy of his mentor's Quirk and all its stockpiled resources. All For One allows him to steal and grant other Quirks completely and permanently: if a Quirk is stolen, its original owner can no longer use it, and if a Quirk is granted, the new owner will be able to freely use it. This applies to All For One's user too, which means Tomura and his Sensei have access to any and all Quirks they've stolen. Because Quirks are sustained in the MHA universe by world-building aspects, my assumption is that All For One won't be able to steal other abilities or powers that aren't Quirks, though it probably would be able to grant a Quirk to someone without one. When applicable, any stealing/granting would be negotiated with respective players.

Because All For One has a ton of stockpiled Quirks, see the wiki for an exhaustive list. Below are ones I think might be more relevant in RP.

+ Regeneration. What it says on the tin, basically allows him to heal from damage inflicted on his body. This can include severe maiming and burning, though there might be a limit to it if his head was chopped off or if he was burned to ash, but this is currently not concretely known.

+ Air Cannon. Can fire large blasts of pressurized air from the palms of his hands.

+ Search. Allows the user to "search" for up to 100 individuals at one time, as long as they've previously met. This Quirk will show the user the locations of their targets up to miles away.

+ Radio Waves. Allows him to jam radio waves.

+ Rivet Stab. Allows him to summon and wield thin, black blades of unknown matter. They are not free-floating—they come out from his hands and spine, but can grow or lengthen and change direction in the air.

Finally, in the same surgery as above, Tomura was granted superhuman abilities in speed and strength, so he can do stuff like punch really hard or jump really high, etc. It was also stated that the introduction of hundreds of new Quirks has essentially caused his body to go haywire, leading to some pretty gnarly situations where flesh and bone have grown uncontrollably, though it seems he was able to control it later on. I don't know if anyone would want it, but I've considered keeping this possibility open for spicy purposes, but on the day-to-day, the resort can help him keep it together physically.

Most importantly, I've been given mod permission to use All For One to give Quirks to other characters. Since All For One has a large stockpile of Quirks (which aren't always shown in canon until they're used), the ones that are given away will likely be made up. Tomura would not do this extremely freely, and would not get rid of any Quirks that he finds useful. There will need to be a lot of IC relationship development, then I can talk to players OOC-ly about the powers their character might want and negotiate what they might be like.