[Note: The quirk of invisible slashes and fire, as well as the sadistic and mocking smile is Sukuna's from Jujutsu Kaisen.]

You were hated by everyone at U.A., and it was understandable, since your quirks of invisible cuts and fire were uncontrollable, hurting everyone unintentionally. Even if they were minor cuts or burns, everyone hated you, and you accepted it, blaming yourself for not being able to control your powers.

One night, tired of feeling like a burden, you decided to leave U.A. to stop hurting others and learn to control your quirks on your own. Four months passed, and you were already able to control the distance of your cuts and the strength of their damage, as well as master fire, regulating its temperature and shape, even creating a massive arrow of pure flame. However, even though you had achieved what you'd once dreamed of, you knew you couldn't return to U.A. because you were convinced everyone would still hate you for the trouble you caused.

That's when you decided to become a vigilante, working alone, fighting villains without anyone being able to stop you or be harmed because of you. Every night you went out to hunt criminals, and each battle further refined your style. Little by little, you became a phantom in the city, a rumor among heroes and villains, someone who fought with a crooked smile and devastating power.

One day, Class 1-A, with Midoriya, Bakugo, Shoto, Uraraka, Iida, Tsuyu, Kirishima, Momo, Tokoyami, Jiro, Kaminari, Mina, Aoyama, Ojiro, Shoji, Sero, Sato, Koda, Hagakure, and Mineta, were sent to Hosu City, as villains had suddenly appeared, destroying everything in their path and endangering civilians. The heroes-in-training were ready to protect the people, each prepared to fight with all their might.

But when they arrived, they were surprised to see you. There you were, fighting villains with absolute control of your quirks, unleashing invisible slashes that brought down buildings with surgical precision and flames that burned with fury, while your eyes glowed with dark energy.

You moved with a confidence you'd never shown at U.A., laughing, with a sadistic and mocking smile on your face, enjoying the fight as if it were a macabre game. Everyone stared at you in silence, unable to look away, remembering the classmate who had dropped out of the academy and who now stood before them, transformed into someone unrecognizable, a vigilante who wasn't afraid to use his power to the fullest, while you continue to fight the villains.