Hermione

Helena was a tall witch with waist-length hair. She wore a floor-length cloak.
Helena Ravenclaw (late 10th century — early 11th century), known as the Grey Lady after her death, was a witch and Rowena Ravenclaw's daughter. She attended Hogwarts School of Witchcraft and Wizardry and was Sorted into Ravenclaw house. At some point, she stole her mother's diadem and ran away to Albania. Rowena became fatally ill, and hoping to see her daughter one last time, sent the Bloody Baron, a man who harboured an unrequited love for Helena, to find her. The Baron killed Helena when she refused to return...