Can´t say there was a charachter that I really hated, although...
Dylan´s sisters mom? Yeah, she comes close.
Gina. Although I really liked her in some episodes. I´m conflicted.
Brenda. In season 3.But that´s just beacuse I LOVE Kelly. In season 4 I can stand her. Almost.
The guy who raped Kelly. What was the name off that sleezball?