Rue is Santa's helper aiding Santa to deliver gifts all around the world on Christmas.

She's a weredeer, a deer human existed since ancient times. She is by herself after poachers slaughtered her family when she was young. She possesses a wild instinct and exceptional physical prowess, and also has a special ability sealed under her name given by her family. Usually she uses her alias and hides her real name. Santa is the only one knowing her real name as of now.