The SOB

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

The one who's treats everyone else wrong without a real cause. Because of this, no one is the SOB's true friend. If they are part of the Main Cast, the other members of the group might get on them for being an asshole, but the SOB doesn't care. The SOB's favorite snack is a sweet, juicy, fresh apple that they eat when they're doing asshole things so we can tell that they're the SOB.

The SOB tends to also be another negative role, like the Bully or a Useless Secondary. SOBs 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 (that could be said to be illogical), then they're the Selective Hater.

Contrast from the Jerk. While the Jerk has legitimate reasons for being who he is, such as those he hates are Pests to everyone else, the SOB acts rudely without any real reason.