Blooregard Q. Kazoo, or Bloo for short, is one of the main protagonist in Foster's Home for Imaginary Friends, voiced by Keith Ferguson. Mac created Bloo when he was three years old, meaning that, by the start of the series, they had been creator and creation for five years.

Bloo also appears in the episodes of Geo's World. For example, in the Season 20 episode "Coraline's Sleepover in Geo Guy's House", Bloo appears as a cameraman.