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.
Not an RPG, but in the Thief series the hardest difficulty usually means that you aren’t allowed to kill anyone. Many people even try to play the games as a ghost. Meaning the only sign of their presence after leaving is the stuff they stole. Every door has to be closed and locked again. Keys stolen from guards have to be returned (in lieu of a game mechanic for this you have to lay it on the ground behind them).
People do challenge runs of the Gothic games as pacifists. So it isn’t part of the games but doable with some shenanigans.