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 are well aware of the wizarding world and have visited Diagon Alley with her. Hermione was originally intended to have a sister, but the planned sibling did not make an appearance in the first Harry Potter novel and, as Rowling noted, it "seemed too late" to introduce the character after that. Rowling confirmed in a 2004 interview that Hermione is an only child. Rowling has described the character of Luna Lovegood as the "anti-Hermione" as they are so different. Hermione's nemesis at Hogwarts is Pansy Parkinson, a bully based on real-life girls who teased the author during her school days.