Peter Pettigrew

Peter Pettigrew was a wizard, a Marauder, and member of the Order of the Phoenix.

Childhood and Hogwarts Years
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First Wizard War
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Betrayal and Redemption
At some point during the war, Peter chose to act as a spy of the order for Voldemort. When the Order suspected a spy, Peter quietly spread some rumors turning some suspicions towards Remus, with even Sirius beginning to suspect him over Peter. When James and Lily Potter went into hiding with their infant son, Harry, a Fidelius Charm was cast to keep them hidden, and at Sirius's insistence, Peter was made their Secret Keeper.

Peter told Voldemort where the Potters were hidden and on October 31, 1981, Peter went to visit them to belay suspicions. While he was initially prepared to let them die, the longer he stayed and talked with them, he began to feel guilty. When Voldemort arrived, he sacrificed himself to protect James from the dark wizard.

Legacy
Because of his sacrifice, willing to protect his friends, Harry was protected from the Killing Curse and Voldemort was defeated.

Personality
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Deviations from Canon
Peter Pettigrew sacrificed himself on October 31, 1981, in order to spare James and Lily Potter and their son Harry. In the original story, Peter Pettigrew did not die for James and Lily, and is responsible for restoring Voldemort to power, thus beginning the Second Wizarding War