Mr. Cornelius Herriman – A British-accented, man-sized, bipedal rabbit friend imagined by Madame Foster. He wears a tuxedo coat, white gloves and a stovepipe hat, as well as a monocle over his left eye (though it is sometimes seen over his right eye). He is in charge of the house (the "President" of Foster's), is extremely strict about the house rules (or just politeness and order in general), and is often found punishing Bloo for his various misdemeanors. It was revealed in "Busted" that the reason Mr. Herriman is so hard on Bloo is because he feels that, given that he is allowed to stay at Foster's even though he still has an owner, he has already broken one of the main house rules. He is extremely fond of his creator Madame Foster, harboring great respect and loyalty to her, even at her most prominent levels of unabashed pep and energy. Mr. Herriman may be considered unruly Madame Foster's superego. On the other hand, Herriman has a love/hate relationship with Frankie, usually working with her to preserve order at Foster's, yet just as often scolding her for what he perceives (often inaccurately) as "laziness" and "immaturity" from her part (usually stemming from the fact that the amount of work she has to do is too much for her to get all of it done in certain time frames). However, at the end of the 90-minute special "Destination Imagination", Herriman admits that he was wrong and finally comes to respect and appreciate Frankie. Also he has a fear of dogs and will punish anyone who keeps dogs in the house it has been showed in the episode "Who Let the Dogs In?" He is voiced by Tom Kane.
- Mr. Herriman met Pooh and his friends in Pooh's Adventures of Foster's Home for Imaginary Friends.