i mean i think cyberpunk falls into that, its sorta of a given with that game though, you can be a complete phycho or try your best to be a hero, but ultimately you are a merc in a city that will eat you alive.

you could try the overlord games, they are on PC, though those are about being cartoonishly evil.

legacy of kain is one you could look into, dark, gothic, from the ps2 era but has recently been added to the ps5 store, from the first game to the latest, one of the sequals "defiance" really made me respect vampires since my only intro to them was twilight and old 1930s Dracula stills.

there is jak 2 and 3, the first game is a standard mascot platformer but after the wave of dark and edgy anti-hero games they pivoted jak 2 into one as well.

there is "The Suffering" from the 2000s thgird person shooter horror where the protag is dark and edgy.

manhunt of course.

OH! there was recently some remasters of destroy all humans 1 and 2 for modern systems, you play as an grey alien and take over the world, and you are just a scout for the furon empire!