Complete Monster: Child-hating Headmistress Agatha Trunchbull, the ultimate Sadist Teacher. Shying away from illegal caning, she resorts to even worse measures that parents are more likely to dismiss as wild stories. Some of these measures involve throwing children vast distances, including out of high windows, and putting them in a torture chamber called "the Chokey"; all of which nearly kill the children involved. It's also hinted that she killed her brother-in-law to get his estate and that she abused his daughter.
Trunchbull: I broke your arm once, I can do it again, Jenny.