Alsara: The Dragon's Legacy
Door is, as it turns out, a dragon who had taken human form. He had lived in the Aerie for all of his life, with some limited contact with the people of Nebogorod. Until just recently, he had never been more than a few miles away from the town.
He apparently had two siblings, an “older” brother and sister; a difference of minutes, as all living dragons are twins. Both of his siblings are dead, however: the sister was killed by the Aturans very recently, while the brother died some time ago in an accident Door has not described.
Beyond that, he is a curious but tentative person, who dislikes violence. His skill with languages and magic seem to match the myths, though, and despite the legendary power he supposedly possesses, he does not seem overly concerned with dominion of the lesser races.
He seems nice.