Blooregard Q. Kazoo (simply known as Bloo) is Mac's imaginary friend and the main character/antagonist from the Cartoon Network series Foster's Home for Imaginary Friends.
Extremely selfish, rude and arrogant, Bloo has noticeably become much more of an protagonist and antagonist since the start of the series, serving as an antagonist or otherwise acting downright good and evil in several episodes. However, there are times when Bloo actually feels remorse for any of his actions and apologizes for whatever he's done.