Mr. Herriman is a man-sized rabbit friend who wears a top hat, a monocle, a tuxedo coat, white gloves, a bow-tie, and a mustache while speaking in an English accent in a personification of the Edwardian era. He is the head of the house and runs things for Madame Foster, his creator. He is the oldest friend in the house, which is something he is quite sensitive about. He is named for Krazy Kat creator George Herriman, with a pun on "hare."He stands six feet tall (seven feet with his top hat on) and weighing in at 210 pounds.
Quite opposite of his carefree and calm-tempered creator Madame Foster, Mr. Herriman is a stickler for rules, having made many silly and impractical rules in an attempt to keep everything "running smoothly," to the point of being ridiculous. Throughout the series he has shown a lot of symptoms of having OCD when it comes to cleanliness and following the rules perfectly.