I’ve beat Fallout NV as a true pacifist - no companions, no death caused by me.
It is funny, because it really doesn’t seem to fit the themes of the game to be a pacifist. You end up doing things that would (IMHO) be more fucked up ethically. It’s also hard for me to leave Vulpes alive - killing him is an every play through thing.
I’ve tried playing Morrowind and Oblivion as a pacifist. Morrowind you can get pretty far, but the Sixth House Base quest requires the death of an NPC. Oblivion… lol. You can sorta try if you don’t count dragging along companions from uncompleted quests, but that doesn’t fit the spirit of the challenge.
I wish more video games allowed you to play pacifist. I play most video games with the least violence possible, but even really well written stories like Planescape: Torment need you to solve some problems with violence.
I’ve really appreciated games like Undertale and Dishonored too.
In Nethack, you can fully complete the game as a pacifist, although it’s VERY hard and the game is already hard to get into to begin with. In that case, you are only allowed to indirectly kill enemies by having your pet(s) kill them or by using spells which make enemies attack themselves. Or simply by avoiding enemies completely. Playing as a healer or wizard is the easiest option, but still very hard. The game rewards this and other conducts (= supported “challenges”) by mentioning it in the very end after you’ve ascended.