Hermione Jean Granger () is a fictional character in J. K. Rowling 's Harry Potter series. She first appears in Harry Potter and the Philosopher 's Stone, as a new student on her way to Hogwarts. After Harry and Ron save her from a mountain troll in the girls ' toilets, she becomes best friends with them and often uses her quick wit, deft recall, and encyclopaedic knowledge to help them. Rowling has stated that Hermione resembles herself at a younger age, with her insecurity and fear of failure. The character was voted the best femalecharacter in a poll conducted amongst Hollywood professionals by The Hollywood Reporter in 2016.