Guy wakes up in the Marvel world in an unknown universe (a mix of comics and MCU) without any cheats or powers and in a badly damaged body of a test subject. He gets tortured and experimented on and eventually makes a deal with an unknown entity to gain power. He will be whatever he wants to be: a savior, a hero, or a maniac who destroys planets and universes.
Imagine a cold and sane villain with his chaotic thoughts more controlled but sane enough to function regularly and with great power to actually fulfill them. Kind of like Batman who laughs on steroids. I'm going for another new idea as I'm tired of reading the usual trope.
The Mc's personality is something I can personally relate to. Bro is just tired of all the crap and wants to end it all, not just for him, but for everyone else. That's not asking too much, right ?
This story will have dark humor and a dark subplot; you might feel it's like some DC story. MC is an antihero and can even be considered a villain as well, so don't expect him to be a goody two shoes; neither will he start catching all girls like Pokémon. He does what he wants.
Caution: Rape, torture, violence, mind control, slavery, strong language, mass genocide, and gore content are present in the opening chapter and maybe later on . There will be many waifu and hero deaths in early chapters . Mc will mature and grow out of mass genocidal phase soon. Enjoy !
I would recommend therapy for the author or just sit down and genuinely talk with a loved one. Talk about everything and nothing it helps