I remember a couple of games when I was little where the player's character started as nobody, saved everything, and still ended up being a nobody. (Space Quest, Star Wars: Shadows of the Empire, Half-Life: Blue Shift...)
... but I can't think of any recent games where the hero begins and ends as a nobody. (Even Lee Everett ends up being a hero to one little girl's entire universe.)
What more-recent games are there where the player's character begins and ends as a nobody and still saves everyone?