To Kill a Mockingbird by Harper Lee

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What is the purpose of Boo Radley's character within the novel?

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Boo serves a couple of purposes within Harper Lee's novel.  It's possible that someone might think that Boo doesn't actually serve much purpose until the very end of the book, but that would be incorrect.  He does, for sure, serve a huge plot purpose at the end of the novel.  Bob Ewell attacks both Scout and Jem one night on their way home from a school event.  Boo Radley rushes to their assistance, saves them, and in the process he kills Bob Ewell.  Without Boo, it's likely that Scout and/or Jem may have been killed.  

Earlier in the novel, Boo serves as the stereotypical "weird neighborhood guy."  I had one growing up.  I'm sure...

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