Peter is a young girl who is friends with Polly, Friday O' Leary, Jonathan Ripples, Martin Launderette, and the little boy named Rita. She first appeared in You're a Bad Man Mr Gum!, where she said her opinions about why Mr Gum kept his garden tidy and what the third bit meant in Billy William the Third's name, along with Jonathan Ripples and Martin Launderette. She appeared again in Mr Gum and the Biscuit Billionaire, where she appeared at Alan Taylor's party at his mansion along with her dad, Rachel. She then didn't make an appearance until the seventh book, Mr Gum and the Cherry Tree, where she was one of the people to fall for Mr Gum's tricks of pretending to be Runtus. Her latest appearance was in Mr Gum in the Hound of Lamonic Bibber, where her new bike was smashed into twenty-three pieces. Peter may have a relation or connection to the boy named Rita, as they have simular names.