Boni is a long-suffering, wise old skull and a friend of Berk in the British children's show, The Trap Door. He lives in the cellar of the castle along with Berk, tucked away in a hole in the wall. Being a simple skull, Boni can't move without being carried, not that he usually feels inclined to go anywhere. He does have his own trolley for when Berk takes him outside, however.

Boni spends most of his time complaining of being bored and berating Berk whenever he decides to open the trap door. He also suffers occasional headaches, usually brought on by Berk's noisier antics, or the pestering of little Drutt.