- For other uses, see Bill (disambiguation).
In "Erection Day", the then Mrs. Garrison introduced Billy at the school's talent show. Billy performed and played "Mary had a Little Lamb" on his saxophone. According to the audience's reactions, Billy played the song poorly.
In "Tsst", Billy called Eric Cartman "chubby", ridiculing him because of his weight problem. Offended by this, Cartman handcuffed Billy's ankle to a flagpole and gave him a hacksaw. He told him he had poisoned his lunch milk and that the only way he could get to the antidote in time would be to saw through his leg. Following this incident, Mr. Mackey mentioned that Billy was now being treated at the hospital.
Billy Turner wears black shoes, blue pants, and a long sleeved, red shirt. He's Caucasian and has messy brown hair. However, in South Park: The Fractured But Whole, The Coon mentions that Billy is a ginger. In "The Hobbit", Wendy states that Billy has narrow shoulders.
Billy is gullible, as he believed Cartman poisoned his lunch milk.