Shinobi Gamer in Marvel

I'm getting quite a few messages of the main character being depicted with a Sharingan. The MC won't and will never get any dōjutsu kekkei genkai, because that will probably make him more OP than he already is.

I'm trying to create a character who's overpowered but balanced with some weaknesses. But this is still an adventure harem story, that I am keeping with the consequences of sleeping with women, with most of his lovers getting pregnant in time. I'm writing this harem with a true life sense and if the girls accepted each other.