I hated Johnny and Oliver. I felt they were there for the same purpose to cause problems with Marissa's relationship with Ryan. I never understood why Marissa felt like she had to be there for those guys and their appeal. So i h ated them because of that. And Johnny was just so freakin boring i would have hated him even if he wasnt a threat to ryan and marissa.
Theres not too many characters that i really hated on this show. They have times when i hated certain characters actions. But there arent too many characters that i downright hated because most of them had good qualities also.