Peter is a Knook, more crooked and less surly than any of his brothers.
Peter brought Blinkie the cat to the Laughing Valley of Hohaho as a pet and companion for Santa Claus. When Claus built a sleigh to deliver his toys, Peter used lion skins to make harnesses for the reindeer. Later, when Santa needed assistance, Peter became one of his permanent servants. (The Life and Adventures of Santa Claus, A Kidnapped Santa Claus)