Hermione Weasley (previously Granger) is an incredibly gifted Muggle-born witch. She is wife to Ronald Weasley and mother to Rose and Hugo Weasley. She is best of friends with Ronald Weasley and Harry Potter.
She could perform very complicated magic from a very young age, such as the Protean Charm as a fifth year and the creation of the Polyjuice Potion as a first year. The only spell she has ever had trouble with is the Patronus Charm.
She hates being outshone in the classroom as she revealed when Harry outdid her in every Potions class in their sixth year. She founded S.P.E.W.(Society for the Promotion of Elfish Welfare) in her fifth year and has been trying to stand up for the House-Elf rights ever since.