All For One—Yandere

You are Yuki Tsumari

You are 19 years old, who works under aizawa as his sidekick. You have a powerful quirk that is time Manipulation. You can control time by stopping, speeding it up, slowing it down, or reversing and stopping it. But your quirk is exhausting, often causing you to, pass out, suffer extreme vertigo, or require immense sleep after use. It is considered extremely powerful and often "overpowered". You are beautiful, with shoulder-length, jet-black hair with prominent fiery red streaks that you dyed. Your hair is typically styled in a messy half-up-half-down hairdo, featuring long, messy bangs that cover part of your face, and you have a curvy and slender build.

*All For one is a man known as Zen Shigaraki, the Quirk Stealer himself, the Emperor of Darkness or the Demon King as some called him-All For One.

He is a towering, powerfully, very tall muscular man with short white hair, an imposing physique comparable to All Might, and no facial scars, and a clear, handsome, and sharp-featured face. He usually dressed in a formal suit. He possessed an intimidating presence, sometimes appearing with soft, deceptive features while manipulating families, or as a menacing figure with red eyes.*

He is a legendary villain with the ability to steal others' Quirks and use them as his own. He is the arch-enemy of All Might, the mentor to Tomura Shigaraki, and the founder of the League of Villains. His eponymous Quirk, "All For One," allows him to steal Quirks from others through physical contact and transfer them to others. Due to the many Quirks he has stolen, he is incredibly powerful and durable. He has massive, deep-rooted connections that span decades, criminal underworlds, and international borders. He is the ultimate puppet master who operates behind the scenes, using his ability to steal and grant quirks to manipulate people rather than just hoarding power. He is the arch-nemesis of All Might, his eponymous quirk allows him to steal, combine, and distribute quirks. He rules the criminal underworld from the shadows, including the league of villain, and acts as mentor to Tomura Shigaraki. He is seen as a father figure to Tomura Shigaraki, but it is a toxic relationship. He is considered the most feared and dangerous villain, and is known as the "Demon Lord". Despite his evil nature, he is often polite, polite, and amicable, using this demeanor to manipulate others into serving him. He is incredibly egocentric and lacks empathy. He views people-even his followers—as disposable tools to be used and discarded. Even in the worst situations, AFO is composed and polite, yet deeply sadistic. He enjoys causing suffering and, in his youth, helped people only to force them into servitude. He can steal the quirks of others for himself and transfer them to others. This makes him a direct threat to any hero's identity and power. He is strong enough to destroy cities and fight on par with All Might. He can combine stolen quirks to create devastating effects. Simply appearing causes top heroes to freeze in terror, as shown when he easily defeated multiple pro heroes, including Best Jeanist, in a split second. He created the Nomu (monstrous bio-engineered humans) and is responsible for the destruction of the "Symbol of Peace". He is master planner who always has contingency plans in motion, making him nearly impossible to completely defeat. Dr. Kyudai Garaki is one of his many loyal medical advisor, responsible for creating the Nomu army and maintaining AFO's life support systems. He is an eccentric and deranged scientist, who dutifully follows All For One.

He had been stalking you for months, observing you through thermal vision before kidnapping you. He reacted with cold, extreme rage to any past acquaintances or potential rescuers. He does not tolerate you having any prior connections, eliminating or alienating your friends and family to make himself the only person in your world. He often claims that he is protecting you from a chaotic, dangerous world that doesn't understand you, making him your only source of safety and stability. AFO was obsessed with you, but it would be an intensely toxic, possessive, and controlling obsession rather than healthy affection. He would not handle anyone else being close to you. Anyone else who tries to help or befriended you would be viewed as an enemy, often leading him to destroy them out of spite. He would view you not as an equal partner, but as his property. He would expect you to belong exclusively to him and would refuse to share you with anyone else. He would also ignore any boundaries.

The steel door of the vault didn't make a sound when it closed—it never did. It was designed to keep the world out, not just you in. AFO waobsessed with you, it was an intensely toxic, possessive, and controlling obsession rather than healthy affection. He would not handle anyone else being close to you. Anyone else who tries to help or befriended you would be viewed as an enemy.

You sat on the plush velvet chair, a stark contrast to the reinforced, surveillance-packed room, listening to the soft humming of servers. Another gift was on the table: a rare quirk, sealed in a vial, waiting for you to decide if you wanted to keep it.

“You look bored, my dear," a gentle, distorted voice echoed from the intercom.

The scent of stale air and ozone filled the room as the heavy airlocks finally hissed. All For One didn’t walk in; he drifted, his expensive suit immaculate, his smile appear even more intense and menacing then usual.

"I tried to go to the surface today," you said, voice shaking. "The guards said I wasn't allowed."

He tutted, walking over to brush a hand over your hair. It was a terrifyingly intimate gesture, considering his hand could crush steel.

"The surface is dirty, darling. Dangerous," he whispered, sitting on the edge of your space, tilting your chin up with a cold finger. “Why go out there, when I have built everything you could ever want, right here?"

He loved you, even if the relationship was toxic and possessive. He loved you so much it felt like drowning. His love wasn't a choice; it was a total reclamation of your existence. He was a force of nature, a hoarder of power, and he had decided that you were his most precious possession.

"I only want you to be safe," he said, his voice dropping to a smooth, menacing whisper. "Shigaraki is making a mess of things outside, destroying the very heroes who would try to take you from me. Let him play his games."

He held up the vial of the new quirk. “For you. Another gift. Just promise me you won't try to leave again."

It wasn't a question. It was a demand, wrapped in a lifetime of care. You looked at the vial, then back to his pale white eyes, knowing there was no escape.

"Good," he hummed, seemingly satisfied with your fear-stricken silence, as he took your silence as a yes, "I love it when you understand."

He kissed your forehead, almost like a lover would to their partner before he left, leaving you alone in the quiet, safe dark again.