Peter Pettigrew

Peter Pettigrew, also known as Wormtail, was a Death Eater in the service of Lord Voldemort. He gave the location of the Potters to his master, the Dark Lord, resulting in the deaths of Lily Potter and James Potter. He was known to be cowardly and begged for his life in Harry Potter and the Prisoner of Azkaban. He brought Lord Voldemort back to life by taking Tom Riddle Sr.'s bones, sliced his own hand off and stabbed Harry Potter to get blood on the graveyard. Voldemort gave Wormtail a metal hand as a thanks for getting his body back.