Who is it? Kuna is my first thought but as Keichan2 wrote you'd expect her there more than others... Who could it be? Student or not? And are they there for an education or to find Harry? If it's the first and not Luna I hope you have a better explanation than 'I was adopted and my real parents turned out to be mages' which is the only explanation I can think of with the Hogwarts students... One of Dudley's friends would be really unexpected!
I expect Damion will have some conflict of interest now... He knows what his father will do if he finds out about Harry... i hope he chooses Harry's side because I rather like him.
Last chapter there was something that bothered me... When Harry met Ryan he told Harry that his parents were a part of said pack as well, but he had no other relatives. But now he suddenly has three sisters... Where did that come from?
Hope you'll continue soon!