What is herriman?

Some articles on herriman:

Foster's Home For Imaginary Friends - Characters - Main Characters
... Herriman ... Herriman's fussiness and fixation with rules and cleanliness, having to take care of everyone and everything in the house, and Bloo's mischief-making (all of which ... Herriman – A gray and white anthropomorphic lop ear rabbit friend imagined by Madame Foster who speaks with a British accent ...