sorry i could only think of one anime but you either already watched it or it's not what you're looking for.
maybe "kakegurui"?
Maybe Wonder Egg Priority
Monster??? Same genre, both explores morality, also has the cat and mouse dynamic.
Def read death note oneshot, it's just quick read and it's fun
https://www.mangago.me/read-manga/death_note_special_one_shot/
Then "Monster" for sure because it has the same vibe and stuff that was already said by someone here
Maybe Devilman crybaby? I think it's the monsters and fight between good and bad that reminded me of it
Also I randomly remembered when my fav youtuber said that Kaguya-sama love is war is like if death note was romcom but that's not probably what you looking for
maybe "code gease"
i need some good comic or anime like this, not looking for obvious character favority or bad obvious mistake, need some good arguments and hard to pin down type of shit