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 School and Jennifer Honey's step-aunt. She is incredibly hot-headed 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.
Agatha, before the events of the story, moved in with her stepbrother-in law and her step-niece Jennifer Honey. When her stepbrother-in-law wasn't there, Agatha abused Jenny. Eventually, Agatha murdered her stepbrother-in law 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 allowed to cry in front of her, but she cried when she was alone.
- Agatha Trunchbull mentions having never been a child.
- Agatha, Zinnia, Harry, and Michael were the only antagonists who appeared in Matilda.