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." 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. He usually refers to others in a proper manner, calling males "Master" and females "Miss" in front of their name, the only time he actually calls people in normal fashion is when he is in pure terror. He is shown to have an addiction to carrots (which he will go to great, even desperate, lengths to hide), despite his best attempts to ignore or get over the weakness. He is phobic of dogs and is easily sent into a panic whenever he comes across a dog or anything dog related which is why he made a rule that no dogs are allowed in the home. Mr. Herriman, though proper, has often shown a lack of social skills. His ways of being proper are to the point to where the other imaginary friends cannot stand him or being around him, his ways of keeping things "running just the right way" often inconveniences the other characters to the point of being disrespectful. Frankie has a strong disliking towards Mr. Herriman, due to his constant lack of consideration towards her and often talks her down, whether he is aware of it or not. He has a strong disliking for Bloo, due to his chaotic nature and constant rule breaking.