Why is Sirius a tragic hero?
Sirius risks his life to save the people he loves several times throughout the series. This includes defending Lily and James Potter by fighting Peter Pettigrew, fighting Remus Lupin to protect Harry and his friends, and fighting Lucius Malfoy to protect Harry and his friends. He caused his own downfall by putting himself at risk for others not only when he died, but also when he was sent to Azkaban. Sirius teaches the audience that you can't always sacrifice yourself for others.
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