Ellie was a short girl with a birthmark on her cheek who lived at Number Seven; he'd occasionally noticed her on Privet Drive or in his class. Only occasionally, though, because she seemed to have a gift for not being noticed. Teachers almost never called on her, and other students rarely spoke to her. She could sneak out of class to the loo while the teacher's back was turned, then sneak back in a few minutes later without her noticing. She could hover at the back of a group of kids being picked for teams, then slink away and climb a tree until the game was over. She could even slip into the middle of the lunch queue without anyone complaining.