Hermione Granger

Hermione Jean Granger is a fictional character and one of the three protagonists (the other two being Harry Potter and Ron Weasley) in J. K. Rowling's Harry Potter series. She initially appears in the first novel, Harry Potter and the Philosopher's Stone, as a new student on her way to Hogwarts. After being saved in the girls' bathroom from a mountain troll by Harry and Ron, she becomes close friends with them and often uses her quick wit and encyclopaedic knowledge to help them. Rowling has stated that Hermione resembles her at a younger age, with her insecurity and fear of failure.