The backgrouind system from Daggerfall. It would've been well suited for Skyrim since you were someone crossing the border at the wrong place at the the wrong time, rather than some anonymous convict the Emperor thought had a higher destiny than sitting in the Imperial City Prison. This background, which would probably be based on race-specific questionnaires, would add a sense of backstory and would apply certain perks and/or additional skill points based on what you chose. Its omission was a questionable error on Bethesda's part since it would have made the game feel less like a shallow action-adventure game and more of an RPG.