Agatha Trunchbull

Principal Agatha Trunchbull is the main antagonist of Roald Dahl's book Matilda, as well as its film and play adaption. She is the headmistress of Crunchem Hall Primary Shool and jennifer Honey's aunt. She is incredibly hot-tempered and will go to insane lengths to torture the children at her school. This went on for years until she was challenged by the young child Matilda Wormwood.

Background
Agatha, before the events of the story, moved in with her brother and her niece Jennifer Honey. When her brother wasn't there, Agatha abused Jenny. Eventually, Agatha murdered her brother and took over the house, even though the house rightfully belonged to Jenny. Agatha abused Jenny even more so, and Jenny lived in fear of her aunt. Jenny was forced to do all the work in the house, and was not alowed to cry in front of her, but she cried when she was alone.

Trivia

 * Agatha Trunchbull mentions having never been a child and that she'd grown up quickly, suggesting a harsh upbringing.