Toad-ally Rude
One of the more annoying and dangerous opponents in Harry Potter is Professor Umbridge. She’s cool under pressure, mean, and perpetually that awful pink. She is portrayed as awful to look at in the books, which serves to further distance the reader from the character.
Being an amazing actor, Imelda Staunton was a natural fit to play this terrible persona. Even then, we find it hard to believe she saw this as a compliment given how unworthy this character was described.