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.
All those games you listed are violence centric, so I imagine the non-violent route isn’t as satisfying. I tried to finish Dishonored (not really an RPG) without violence, but most of abilities involve violence and getting caught just meant waiting for them to kill me instead of fighting back. The gameplay just isn’t optimized for it like something like Thief is.
There are games designed for non-violence where violence simply isn’t an option, such as Disco Elysium or WanderHome. Searching specifically for games without violence is probably a better option than finding games where nonviolence is an option, unless you’re specifically looking to find clever ways to play games non-traditionally.