Boo (character), a ghost character in the Mario series Boo (Sonic the Hedgehog character), a ghost character in "Sonic the Hedgehog" series Boo, a hamster belonging to Minsc in Baldur's Gate, and a character in Megatokyo Boo, a character in the Malaysian animated television series Boo & Me Boo, a character in the manga and anime Crayon Shin-chan Boo, a human baby girl in the animated film Monsters, Inc. Boo, Carrie Black's nickname in Orange Is the New Black Boo! (comic strip), a character in the British comic The Dandy created by Andy Fanton Majin Boo, an anime and manga character in Dragon Ball Boo Radley, a character in the novel To Kill a Mockingbird and its adaptations Boo, the title character in Boo!