Peter Petegrew (Book Version)

Peter Pettigrew, also known by his nickname Wormtail, is a major antagonist in the Harry Potter books. Peter was a wizard and Death Eater who abandoned and betrayed the Order of the Phoenix. He was a Secret Keeper for James, Lily and Harry Potter. He betrayed their trust to Voldemort. He faked being killed by Sirius Black and killed twelve Muggles in the process, framing Sirius for everything. He lived in hiding in Animagus form for nearly thirteen years by being the pet rat of the Weasley family.

Why Was He Rejected?

 * He has remorse for his betrayal, leading to him question his self-worth.
 * His death is played for sympathy.