Peter Pettigrew (Human Form)

Peter Pettigrew, in his scrawny human form, bursts onto the scene in *Prisoner of Azkaban* as the treacherous Secret-Keeper who faked his death and framed Sirius Black for the murder of James and Lily Potter, surviving as Ron's pet rat Scabbers for twelve years. His watery-eyed, fingerless visage embodies cowardice and betrayal, marking a pivotal revelation that shatters Harry's understanding of his parents' demise. Though his exposure in Book 3 confines his major role, Pettigrew's shadowy allegiance to Voldemort endures, culminating in his reluctant mercy toward Harry that seals his ignominious end.