Overpowered MC - and I mean overpowered, not just extremely strong. I went through a lot of topics and most people recommend strong, but not overpowered, chars (Id, Noblesse?). What I want is character who is way above of all others from the beginning to end. So strong that no other character will be anywhere close to him (great would be if even all other characters together would be nowhere near him).

Evil MC - this time its manga with MC who is evil (and truly evil, not just evil in others eyes or evil type character we can see in many shoujou mangas, but its ok if he sees himself as good guy). And most important thing, manga must end with happy ending for him (e.g.: if he is maou it ends with all humanity being wiped out or maybe few humans left alive and enslaved).
It can also be somebody like Momonga from OverLord or Lelouche from Code Geass (Without his love to his sister and sacrifice)

I prefer Demon Lords btw... i like Evil Demon king that conquers world :-) Like Maou Sadao from Hataraku Maou-sama! on start of its story :-)

Feel free to recommend me something :-)

Sincerely, your request it's pretty hard one. For now the only manga which suits the description to me it's MW by Osamu Tezuka, but still MC is not overpowered (just extremely smart and unstoppable).

one punch man

the title is somewhat meaningful