Peter Pettigrew

Peter Pettigrew, better known as Wormtail, is a major antagonist in theHarry Potter franchise and serves as the hidden main antagonist of Harry Potter and the Prisoner of Azkaban and the tertiary antagonist in Harry Potter and the Goblet of Fire. He was one of James Potter's friends. Later, he joined the Death Eaters and betrayed James and Lily Potter in the process.