This happens after Class 1A start working as Heroes. But someone or something started prowling the streets at night... (I have only seen mha until season 3 so don't blame me if it's inaccurate ;-;) (Villain Tanjiro AU don't judge hehe)
Acompañen a Akaza a esta nueva aventura donde con el objetivo de estar con su amada en muerte hace que cambie de mundo junto con una persona que lo va a acompañar durante su travecia.
Tanjiro Kanado's life has gone to hell. His whole family was brutally murder and his sister has turned into a demon. However, she still has humanity and continues to love him. Now Tanjiro needs to learn to become a demon slayer to cure his sister, however, every hero in Japan is looking for them so both are on the run and train in a hidden world that not even the heroes know.
Muzan Kibutsuji was dead- dying at the hands of The Demon Slayers after warring with them for over 1000 Years. When he died, he knew full well that he was never going to reincarnate... or so he believed! After an untold amount of time in the void, a strange voice gave him a choice, remain in the void for the rest of time? Or... become reborn. He chose the latter.
After being told that he can't be a hero by All Might, Izuku ends up in a state of depression. One night after a walk he bumps into a pale man who turns out to be the leader of the demons named Muzan. Izuku while fleeing from the demons is saved by the Hashira, who work in the shadows of the hero society. Now the powerful samurai will teach Izuku how to become a strong hero.
Muzan Kibutsugi was dead, and would never reincarnate due to his status as a Demon and because of his actions. Or at least, that was what everyone thought. While Muzan would never get the chance to truly live again, he could always make sure his legacy carried on in an event of a rebirth... (OP!Izuku, MorallyGrey!Izuku, Demon!Izuku, HeavyCanonDivergence)
Akaza in My Hero Academia. Akaza's backstory except instead of attacking the rival dojo he leans towards becoming someone good instead. I've really been wanting to try out this concept cause I love it.
an idea for kny x bnha you can use it(maybe add a kny recanation as midoriya I suggest fem midoriya)