Hora_Do_Mori
I remember reading the fanfic it was actually a marvel fanfic. The main character created a system in his mind where it shown how he adapted and what powers he got. He was being experimented on by weapon x program and weapon x base had a nuclear bomb which exploded when he escaped allowing him to gain the power of reality alteration. He also had a sister who was also a mutant and who was separated from him. He was looking for her. He eventually became a mutant messiah. Also it was Franklin Richards from f4 and wolverine from x- men who tried to go back in time to kill him. But he realised something was wrong with his memory and knew someone was time-traveling and gained the power to send his consciousness into his past self and use his full power to defend himself. And because of their tampering his mother died of illness sooner which greatly angered him r.i.p. wolverine.