Maggie Smith

Dolores Umbridge
Imelda Staunton, left, seems far too beautiful to play Professor Umbridge, the slack-mouthed toad of a Defense Against the Dark Arts teacher assigned to the school by the Ministry of Magic. She denies the return of Voldemort, and won't let students practice ... morespells with wands. Before long, she's running the school.

Defining quote: "Hem, hem. Hem, hem."
Most likely found: Writing new rules for Hogwarts.
Known for: Decorating her office with kitten-themed plates.
Most wants: To run Hogwarts (into the ground).
Loathes: Harry Potter.

Also pictured with Staunton are professors Trelawney (Emma Thompson), middle, and McGonagall (Maggie Smith). McGonagall is Harry Potter's house adviser, cool-headed and resolute. Trelawney is the nearly incompetent Divinations teacher, who got her job at the school for making one crucial prophesy.