Barnaby B. Busterfield, also known as (much to his own dismay) "Buster", is, of course, a bust of a man with a curled mustache. He founded the library and he is its namesake. He doesn't like that he is always being annoyed by Walter and Clay Pigeon but gets it anyway because being a statue, especially without legs, cannot go anywhere. He never seems to be in another place.
He is performed by Tim Lagasse, who also plays Arty Smartypants.