OP MC Recommendation pls

Hello again, now I know this it's a common question asked but guys...Pls recommend me some manga with OP MC. It can be fantasy or Isekai or it can even be Manhwa with OP MC. I just want something that can satisfy my hunger for OP MC.

Now these are the qualities I will list that the MC can have (they are not a must! well....some are) Mc can lead a quiet life but make sure he uses his OP powers.

-MC is OP -MC can be ruthless -Extra points if the MC used to be weak and then became OP -MC is underestimated -I don't want the MC to be all happy and think that the world is great and jolly (You can recommend this type of MC to but only if MC is OP)