I'm not even one to feel animosty towards a fictional villain, let alone a mildly annoying side character, but the American-accented French flea from the Tom & Jerry movie where they talk makes me really angry for some reason - there's just something about that face... It might be a weird meta thing, he doesn't do anything bad in-universe but out-universe he and his dog friend actively make the movie substantially less entertaining by encouraging Tom & Jerry to be friends who can talk, therefore having a much more negative effect on the real world than any movie villain - but I don't mind the dog because he's Literally Dribble WarioWare.