Mazey McGonagall was only four months old when she was kidnapped by Alaric Vane, her mother Minerva McGonagall never stopped hoping she would return though she gave up the search devastated after 6 long years of searching. Alaric Vane was a Ministry official that lost his job because of Minerva and wanted revenge..so he kidnapped baby Eileen and raised her in filth. When Mazey was 4 years old Alaric started subjecting her to the Cruciatus Curse..he tortured her every day until she turned 11 and escaped. Mazey was the size of a 6 year old due to malnutrition, her growth had been stunted. Mazey has a photographic memory-she remembers everything and can use wandless and wordless magic flawlessly, she taught herself so that she could extract her memories of the torture that she keeps in hundreds of vials in a velvet box so she would have evidence. Mazey walked for one week until she found the station and slipped onto the train. Now, finally at Hogwarts nobody knows who this filthy tiny girl is but her eyes and hair, exactly like Minerva, are unmistakable. Mazey is a master of Potions though it's because of her memory and her insanely steady hands as she has never made a potion before. She owns no wand.