Hermione Granger completing Snape's homework assignment from the class, while Crookshanks proves vital in exposing Scabbers as Peter Pettigrew, a friend of James and Lily Potter who revealed their whereabouts to Lord Voldemort the night of their murders, and was able to wrongly implicate Sirius Black (revealed to be Harry's godfather) in the Potters' deaths. The Time-Turner enables Hermione and Harry to rescue Sirius and the hippogriff Buckbeak. Hermione is horrified by the cruelty that house-elves suffer, and establishes S.P.E.W., the Society for the Promotion of Elfish Welfare, as an effort to gain basic rights for them. She is Bulgarian Quidditch prodigy
Hermione Granger original last name was "Puckle", but Rowling felt the name "did not suit her at all", and so the less frivolous Granger made it into the books. Hermione first appears in "Harry Potter and the Philosopher's Stone" when she meets Harry and Ron on the Hogwarts Express, where she mocks Ron for his inability to perform a spell to turn his rat yellow. She proves just how much she knows by declaring that she memorized all the textbooks by heart and by performing the "oculus" spell on Harry to fix his broken glasses. She constantly annoys her peers with her