17. Guilty Spark
GAME: Halo 3 (360, 2007)
Ugh. In the annals of villains, it's tough to go more annoying than ol' GS. He's like Wheatley from Portal 2, minus every single shred of charm or humanity. We said it before, and we'll say it again: Did Bungie really have to make him the Gilbert Gottfried of video games?