Bendy

Bendy is the name of an imaginary friend on the show Foster's Home for Imaginary Friends, and only being in one episode to date, namely Everyone Knows It's Bendy

He was bought to Foster's when he kept missbehaving around his creator's house. However, once he was at Foster's and no one was around, he started to missbehave, causing Bloo to get into trouble, when he was trying to prove Bendy wrong.

However, later on the episode, Bloo devised a plan to bust Bendy, which turned out to work, with one of the bathrooms to be completely destroyed and him being caught by Mr. Herrimen.