You can be evil in Oddworld: Abe's Oddysee, Oddworld: Abe's Exoddus and Oddworld: Munch's Oddysee. All you have to do is kill all your buddies (except the ones you have to rescue to progress through the game), and you'll get the Bad Quarma. Do it perfectly and you'll get the Dark Quarma.
But, of course, that's not what you mean. It sounds like you're going to enjoy Hand of Odd, a real-time strategy game using characters, gameplay and GameSpeak instead of menus and cursors. You can chose to be one of three different sides, all fighting for the right to reign Oddworld, including the Glukkons and Vykkers.
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