BJ is a main recurring character on the television series Barney & Friends.
A seven-year-old yellow Protoceratops, BJ made his first appearance in season two of the show with the episode "Look at Me, I'm 3!" in 1993.
BJ is a good friend of Barney's and the older brother of Baby Bop, whom he frequently calls "Sissy", though on rare occasions, he does call her by name. He is also Riff's cousin and his best friend.
BJ is described as an impulsive dinosaur but is always eager to help his friends. As an active seven-year-old, BJ also likes to run, jump, and ride around on his red scooter. Although he loves baseball, basketball and soccer, it's safe to say that BJ has never met a sport he didn't like. He also likes to play the drums and the guitar.
BJ's theme song is none other than the titular "BJ's Song."