Any novel similar to Yobidasa Reta Satsuriku-sha where MC is an anti-protagonist, gives 0 F*cks about anyone and only want what he wants. etc, etc.
What? You are asking for someone that is as creative as that Author who writes all his chapter titles after songs?! Wha... Blasphemy. As if that exist.
Warlock of magus world protagonist puts self preservation as #1 and can be pretty ruthless to get what he wants. Pretty good read
aahh yes the edgiest protag to ever be translated. http://www.novelupdates.com/series/nidome-no-yuusha/ here you go, near equal in the edginess
Maou no Hajimekata btw thats not an anti-hero, anti-hero is when the MC saves the world but in a non-hero way. MC in Yotusuba is bordering on straight up villian.
https://mike777ac.com/hardcore-op-ness/ An a**hole on a quest to become OP and to satisfy all his lusts (Very 18+).