Jonah, Cigarette-smoking man, certainly. I’d also include the Borg (a collective, but you know what I mean), Leland Palmer from Twin Peaks , Sheriff Lucas Buck (American Gothic), JR Ewing, Newman and, most sinister of all, John Hill, the owner of Melville’s (upstairs from Cheers). I also hated Al from Happy Days, but I guess he wasn’t really evil as such.