The principal of Claude’s school in Madison, Wisconsin, before Claude transitions to Poppy. Mr. Harmon is a nice guy, and since Penn has had five kids at his school, they know each well and get along easily. Penn and Rosie meet with Mr. Harmon, as well as Ms. Revels and Miss Appleton, when Claude begins wearing a dress to school. Mr. Harmon is accepting of Claude’s gender identity and offers to accommodate all his needs, but Ms. Revels is the one who makes all the decisions regarding Claude’s needs at school.