Holiday dragons are a very mysterious breed. They are only seen during winter, and even then it is hard to catch a glimpse of one. They are responsible for the general cheer that spreads during the holidays. In essence, they are the “Spirits of Winter.”

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

A laid-back and usually even-tempered dragon, J is one of a few dragons that make up the Elite Beat Clan (often shortened to the EBA Clan). The EBA Clan is one of few known clans that help out people through using music to encourage them. J is somewhat an "intermediate" agent in the clan, often helping out whenever he is needed and when jobs are either too tough for Spin to handle or if Chieftain or the Divas (the females of the clan go by this term) are too busy to take on the task. Besides the fact that he's a fairly good dancer, not very much is known about him by most people. It is unclear if his actual name is J or if it is an alias he uses. However, that remains a secret between him, the EBA Clan, and Kim, and they probably won't be telling anyone anytime soon.