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Revan - as seen in Star Wars: Knights of the Old Republic
Revan is unique in this list in being a villain you never actually meet, let alone fight, and whose identity is unique to each player. This monstrously evil Sith Lord, the aftermath of whose galaxy-wide onslaughts you keep stumbling across is, in fact, you before you lost your memory. (We did say there would be spoilers). The gradual build-up to the revelation is masterful, clues scattered throughout the game and influenced by how close to the dark side you play. Once the truth is told, you can choose either to continue Revan’s dark work or to fight for a better tomorrow - either way, he/she’s a villain that can never actually be defeated.
