トナカイ

A boy in a reindeer costume who acts as Santa's support. He is not actually a reindeer. He comes from a family of reindeer support, and although he wears a reindeer suit, he is a sensible person. His job is to pull the sled with a motorcycle that looks like something you've seen before. He used to work for Aria's predecessor, Claus (an old man who had sex with Aria before he left to cheer him up, but he hurt his back and forced him to retire), but when Claus retired, he was forced to become Aria's assistant. He is a pitiful guy who is always involved in the messes that Aria makes, but he is always there to cover for her. He's sometimes offered as a "present"... [From official site]