One of my Pathfinder characters, Bentithan Flinteye. He's an evil, but pragmatic, Aasimar psychic warrior, who considers his actions to be for the "greater good". He'll use this to justify a lot of things to himself and others, but make no mistake he's evil and ultimately just wants more power for himself; after all, wouldn't he be able to do more good with that power? There would be plenty of people who'd think he's right.