Ok so another idea here. My idea is mainly about the character known as Fushi, he comes from the manga To your eternity/ to you the immortal/ fumetsu no anata e . There are a lot of alternative names. If you didn't already read the manga I really recommend it to you because it's a master piece! Its not finished yet but you don't need the end to get how good it is. So my idea was that fushi ( and his friends I don't know?) wakes up in the bnha world and he is like the most op character that I know of after saitama you know?! So actually my area wasn't very developed and I don't think anyone is going to pick it up cause there aren't a lot of to your eternity fanfics so people aren't going to be interested but at least read the manga because you're reaaaaaalllyy missing out on something right now!
That's all thank you!!