Debut Game: Portal 2
Sidekick To: Chell
It's hard to get angry at, or form any kind of emotional connection to, something that has no face. Wheatley, however, makes up for his lack of humanity with dry, British repartee. Voiced by British comedian Stephen Merchant, Wheatley is your friend at first, and your enemy in the end. Whether he's helping Chell break out of Aperture Facility or trapping her inside of it, Wheatley adds wry menace and humor to this now classic puzzle game.