Games Where You Gradually Turn Into A Villain

With characters in games, as with people in real life, I always like to know where I stand. Much as I believe in second chances, betrayal is something that it's extremely difficult, if not impossible, to come back from. It's always very emotionally effective, then, for developers to subvert those kinds of expectations. Sometimes, they'll give us the whole length of a game's story to bond with a protagonist, only to reveal at the end that they weren't at all who you thought they were. There's nothing quite like a game that completely betrays player expectations.