Wheatley (Portal 2)
As your best bud in the beginning of Portal 2, Wheatley seems like he’s merely an adorable little A.I. with a funny accent that you can’t help but love. But once he gets just the tiniest smidgeon of power, he goes totally bonkers and becomes almost as psychopathic as GLaDOS.
Then again, Evil Wheatley provides some of the most hilarious dialogue in gaming history, so we can’t possibly stay mad at the old chap. Especially after hearing his heartfelt outer space apology after the game’s credits.