Amaya Isabel Granger is a half-blood witch and one of the main antagonists of The Dragon Legacy (alongside Dumbledore, Ron, and Molly Weasley). She was a student at Hogwarts School of Witchcraft and Wizardry and hailed as the "Brightest Witch of Her Age", and harassed Harry, trying to get him to be her friend. When he rejected her, Amaya brought her wrath down.
When she was fifteen, Amaya was arrested after being exposed for stealing both money and ancient books from Harry's vaults. After her expulsion from Hogwarts, and the school being taken over by the Prince-Riddle family, Amaya swore revenge on the young wizard and his friends for ruining her life.
Even before then, Amaya was one of the most hated people in Hogwarts; nobody liked her because she kept acting superior towards them and flaunting her knowledge.