Spoiler for book 3 of A Song of Fire and Ice (Ice and Fire? Fuck. My brain isn’t working.)
Joffrey fucking Lannister. THANK YOU, GRRM. Finally. My friend and sometimes cheer each other up by reminding ourselves that at least Joffrey Lannister is dead. I wasn’t too upset when his grandpa bit it, either.
Percy in The Green Mile. Not one redeeming thing about that little sonofabitch. Nothing makes me want to break out the cannon of whoop ass like someone who harms an animal (to say nothing of how he botched Delacroix’s execution).
Emperor Palpatine. He and he alone is responsible for us having to sit through Episodes 1-3. If he’s stayed to the straight and narrow, none of that cinematic dreck would have been necessary. Therefore it was fitting that he die like a dog.
Tim Roth’s character in Rob Roy, and Gary Oldman’s in Leon - The Professional are the most loathsome villains I can think of. Well, that and the main guy from The Cook, the Thief, His Wife, and Her Lover. I find that movie to be pretty loathsome all around, though.
Magua in The Last of the Mohicans is good one too.
Gregor MOTHERfucking Clegane. The Mountain that Rides had absolutely no redeeming qualities - a perfect psychopath, without the subtlety and charm. It’s a shame he took the Red Viper with him, but man, what a horrible, well deserved death.
At the time, I was as happy as you were when Tywin took his lask trip to the bathroom. But Martin has a way of messing with you. After watching his various family and relatives reminiscing over his live throughout Book 4, I actually started to regret his death. Sure, he was an unforgiving man, completely without empathy, mercy and kindness, but he also possessed considerable abilities, was never needlessly cruel, and he sincerely believed that he was doing what was best for his family and for his country - in that order. Plus, his death put Cersei in charge, which was not, shall we say, an optimal situation.