firepoint525 said:
I would say Fonzie, in the later seasons of Happy Days, to the point that Richie decked him once, and tried to deck him again, in one of the later episodes. But Fonzie never grew (and thus maybe never grew up) like some of the other characters did. But of course, Happy Days had far worse problems in their later years than just a Fonzie who never grew up.
You make a good point about Fonz, but the episode where Richie punched Fonz(but didn't 'deck' him) was the two-part opener of the final season, in which Richie (briefly) returned home, before leaving for good. It was Richie who was written as a jerk in that story, until he finally realized his mistake, and got eevryone's blessing to..well, go be Ron Howard and move to Hollywood.