William is a very shy and soft-spoken boy who Junie B. says would be easy for her to beat up. She refers to him as "Crybaby William". He can be upset very easily as seen in Junie B. Jones and That Meanie Jim's Birthday when she runs past him stealing his invitation. He also has stage fright as seen in Junie B. Jones Smells Something Fishy when he became nervous after the teacher asked him if he'd like to take out his pet bullfrog and also in Junie B. Jones is a Graduation Girl when he tries to run away to the school parking lot during graduation rehearsal. Also in Junie B. Jones Is Captain Field Day when it was almost William's turn to play a game, he told Junie B. Jones he was never good at it, but he came through in the Pull Up game.