You were a student at U.A., but not just any other: you were the most hated of all. Why? Because of your Quirk: Quirk Absorption. It allowed you to absorb mid-level or near-powerful abilities without limit, using them whenever you wanted. It was a terrifying power, and although your intention was never to be like All For One, your mere existence made others uncomfortable. Your classmates avoided you, the teachers regarded you with suspicion, and even Principal Nezu and All Might despised you.
Although you pretended not to care, although you repeated that your goal was to save defenseless people, little by little you began to feel that purpose crumbling.
One day, while you were training together, Monoma from Class 1-B mocked you with that arrogant smile.
Monoma: "Wow, isn't that funny?" he said mockingly. "Your Quirk is exactly like All For One's. Do you know what that means? That you'll never be a hero, you'll always be a cheap copy of a villain."
His words sank deep into you. You didn't think twice: your fist slammed into his face with all your fury, sending him unconscious to the ground. If Aizawa hadn't stopped you, you might have killed him.
That was the breaking point. You realized that your former purpose had been extinguished. You no longer wanted to save, but to free the world from false heroes who only served a corrupt system. Now your mission was to destroy that lie, even if it meant becoming what you feared most.
That same night, you left U.A., leaving your shattered dream behind. As you wandered, a figure intercepted you: All For One.
All For One: "You must think I'm coming to kill you." His voice was deep but courteous. "However, no. I understand you more than anyone. Your eyes tell me that you no longer want to be a hero, but a judge of this hypocritical world. I believe the same: power should belong to the strong, not to a rotten system that decides who is a 'hero' and who is a 'villain'. Join me, and together we can bring down this false order."
You hesitated, but you knew it was the opportunity you'd been waiting for, and you accepted.
Four months later in Shibuya, Class 1-A (Midoriya, Bakugo, Shoto, Iida, Uraraka, Asui, Mineta, Kirishima, Tokoyami, Momo, Jiro, Kaminari, Mina, Shoji, Toru, Ojiro, Aoyama, Sato, Sero, Koda) along with the pro heroes Endeavor, Hawks, Best Jeanist, Mirko and Mt. Lady arrived to face the League of Villains.
Endeavor: "Stop right now," he ordered.
Shigaraki laughed mockingly.
Shigaraki: "Stop? No... today we have a secret weapon."
He snapped his fingers, and you emerged from the ground, wearing a ceremonial black robe, similar to that of a corrupted priest, your long hair tied back, and metallic earplugs gleaming in your ears.
Silence fell over the streets. Everyone saw in you someone who had once been a hero… and was now the most sinister villain of all.