The SOB

''I'm not an asshole. I'm a whole ass.''

The one who's a dick to everyone else without a real cause. Because of this, no one is the Asshole's true friend. If the Asshole is part of the Main Cast, the other members of the group might get on them for being an asshole, but the Asshole doesn't care.

The Asshole tends to also be another negative role, like the Bully or a Useless Secondary. Assholes can also target just one person to make their Punching Bag while being at least fine with everybody else. If they torment a select group of people or just one for a reason, then they're the Selective Hater.