Nickname Fancy Pants
Age 10
Occupation Student
Band Job Band stylist
former security
Portrayer Brian Falduto

Billy is a student at Horace Green Prep School which Dewey Finn temporary teaches at during the film. Billy starts out as a member of the security team but asks to become the band's stylist, earning himself the nickname "Fancy Pants".

Billy tends to act quite effeminate, which is shown when he calls his outfits for the band "Glitter Rock, Glam and Fabulous".