As others have said; so long as they're not cartoonishly evil. Which means they can't be entirely bad, as the OP demands. Everyone's a hero in their own story.
Not sure about demonic or monstrous characters though. I guess they don't necessarily have to have believable personalities. But the game would still have to be more then an acts-of-depravity simulator.
Not sure about demonic or monstrous characters though. I guess they don't necessarily have to have believable personalities. But the game would still have to be more then an acts-of-depravity simulator.