One-Punch Man
Denji is seriously like that with an extra bit of respectful pervert vibe to him (always ask for consent but is always hornie)
I think Jigokuraku fits what you are looking for and ajin too from both the villain and mc (although it takes a few chapters for mc to be like that)
The Heavenly Demon Can'r Live a Normal Life is pretty good, as is Seoul's Station Necromancer!
Thank you guys!!!
anybody know a manga with a MC that gives zero effs? like a complete badass/overpowered character been watching movies like that lately and wanna read something similar. TIA!