Hazel is a Faerie, specifically a Centaur, working as Courier. He delivers both letters and packages for anyone who calls upon him.

Hazel is a friendly and polite Fae, who seems happy to carry out his job. He's also a very loving nephew to his aunt, Marie, dutifully visiting her every Christmas despite the fact that there was a stigma against visiting those born with two-legs among his herd.