It was previously believed that purple dragons were exclusively female, but this is not the case. Recent environmental shifts have revealed the existence of both genders of this breed. Female behavior is well known; they are primarily herbivores but will eat meat during mating season. On the other hand, very little is known about the behavior and habits of male purple dragons.

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.

This dragon is sometimes a Vocaloid and sometimes a potato. He can't decide whether he is a singing dragon or a small brown tuber. But perhaps the strangest thing about Gaku is the sign which he wrote above his Cave: the sign which contains his message to the world, his everlasting legacy, a perfect description of all that comprises his odd personality. It reads "Sorry. And sometimes a potaito."