>>106028393Lumpy is way more deep than Ponihead, she is not simply a jerk, she is most of the time well intentioned or at least see herself as so, she get deeply insulted when Finn accused her of being selfish, she admits that she most of the time can't express herself well what makes her look like an asshole, she only get angry at her parents because she misunderstood them believing that they see her as a little kid instead of an adult.
Ponyhead in the other hand is completelly shallow, she got zero development since her first scene in the show, she is a jerk for the sake of being a jerk.