Dolores Umbridge – Harry Potter and the Order of the Phoenix (2007)

Played by: Imelda Staunton

We're pacifists, so we would never, ever wish the cruciatus curse on anybody. OK, maybe, possibly, except for Dolores Umbridge. Think of your least-favorite teacher, and times that unadulterated hatred by about 132. As the new Defense Against the Dark Arts professor under the Ministry's strict regime, Dolores proceeds to make Hogwarts less like a school and more like a maximum-security prison. Ugh, and her peppy little giggle makes us want to have tea with a dementor. In short, Dolores Umbridge is the worst.