Seven Little Monsters, created by Maurice Sendak, follows the adventures of seven monster siblings, each with their own quirky traits and personalities. Billy is One's Boyfriend of the seven monster siblings. He helped the Seven Little Monsters in a baseball game and One introduced him to her brothers, Six, Henry and Mary as well as her mother. His endearing nature and the way he interacts with his siblings make him a favorite among viewers, both young and old. A fanart Seven Little Monsters cartoon cursor with Billy and his blue cap.