I'm not entirely sure, but I think you might be able to beat the Fallout Games without killing. They're definitely violent games and it would be quite difficult, but there is usually a peaceful option for completing main quests.
I do generally try to play these games fairly peacefully, although I don't hesitate to defend myself.
In all Fallouts can you complete the game peacefully?
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I’m not 100% sure, but they definitely made a point of usually having a peaceful option where you can rely on intelligence or charisma or other skills.
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