This might be a very specific/niche but I am looking for books where the main protagonist (and the love interest if they have one, perferably) are more villainous/anti-hero. Not the bad boy with a heart of gold trope or 'bad' character within the romance sense of the word (i.e. cheating, doing drugs, running away from something, etc) but rather doing terrible things and enjoying it, that kind of thing. Preferably fantasy or sci-fi. This might actually be incredibly specific, maybe even too specific.
Does anyone have any recommendations?
Please and thank you.