I wish they killed Cletus. I kinda liked him years ago, but he's just absolutely obnoxious and unfunny now. The only characters they "killed" are Dr. Nick (at the end of the movie...oops...did I give something away?) and Gil in Sunday's episode.
I also wish they'd get rid of the owner of Costingtons. he's only been about shortly, but he's just an unfunny joke on Mr. Spacely.