Mrs Cynthia Oddbod is the headmistress of Ashton Primary School. Despite this title, she is somewhat kinder to Horrid Henry than Miss Battle-Axe. She is generally good-natured but can act strange at times. She was the "time capsule thief" who dug up time capsules from the school grounds at night in the episode Horrid Henry's Time Capsule.
She appears to have ginger colored hair in a ponytail, and pale skin. She wears a purple-blue dress, stockings and blue high-heels.
- Her first name is revealed in the episode "Horrid Henry, Horrid Headmaster".
- She has a cat named Tiddles.