Midoriya was told at an early age that he could still be a hero if he just became strong despite being quirkless. And he does, probably surpassing All Might in raw strength. But, after achieving such power, he undergoes a burden that only the truly overpowered would understand. Boredom. Because all it takes now to achieve all of Midoriya's dreams is just One Punch. (Cover by Me)

Izuku always wanted a quirk. Despite All Might promising to train him to be a quirkless hero, Midoriya wished he had a superpower of his own. So when a black slime alien offers him amazing powers in exchange for a regular dose of dark chocolate and liver, a partnership is made. Now Izuku can finally achieve his dreams. If he can keep his kraving for brains under control though.

Your MHA fanfic but everything and everyone is in the wrong franchise. Or maybe... it's just a different reality