Game of Thrones fans remember the Waif well. This was the girl who made Arya Stark's (Maisie Williams) life a living hell — and even tried to kill her — as she trained to become one of the Faceless Men in Braavos during seasons 5 and 6 of the hit HBO drama. And as many actors who do their jobs well on popular TV shows know, fans can often blur the lines between characters and the people playing them.