You will be attending Royal High in a week. School for Royal Children. Every student there is either a heir to a throne-Crown Princess/Prince or just a Princess/Prince.

You are the child of the Moon Kingdom King. Also known as the Shadow Realm.

The thing is to everyone else and their kingdoms the Moon Kingdom and its people seized to exist so long ago.

People probably will mistake you as part of the Ice Kingdom, for your appearance. Why not have fun with letting them think that, hm?