
Hm. Looking over the responses it seems we've gotten a little far afield from what I think was the original concept. There's a lot of mention of playing morally questionable characters, but I think the idea (and correct me if I'm wrong and asserting things that are untrue) is how to play antagonists as opposed to just "bad guys."
It's possible to play someone with a sociopathic streak, or is willing to kill if they're slighted at all, or someone who decides all crimes are punishable by death regardless of how minor an infraction. That's not the same as playing an outright player-character-opposing antagonist.
It's possible to play someone with a sociopathic streak, or is willing to kill if they're slighted at all, or someone who decides all crimes are punishable by death regardless of how minor an infraction. That's not the same as playing an outright player-character-opposing antagonist.