Peter Ryomen (Betrayed Spider-man)

Peter Parker was once Spider-Man, but that all changed when Otto Octavius hijacked his old body, and when Peter tried to get it back, he failed, and Octavius became a villain, a menace, a so-called 'Superior Spider-Man'

But when Octavius gave Peter his body back, his friends, his allies, everyone he had previously trusted, admired, loved... they all betrayed him

Peter with so much hatred he had enough, if they one he gone and want to kill him why not he not kill himself, with that he shoot his web on ceiling to make it like a rope and he pick his chair so he can climb and tied the rope in his head. Even thought peter have hatred he feels sad, after he finish tied the rope into his head.

after he kill himself something take over his body, his soul maybe gone but a new soul enter on his body and that soul is

Ryomen Sukuna The King of the Curses