Nebula Dragons are nocturnal creatures. With the best eyesight to be found, they are often seen staring into space. Each dragon tends to observe a particular nebula and will eventually change their colors and patterns to match it. As the nebula changes over time, the dragon changes with it. The more intricate the design of the nebula, the better chance an individual has of attracting a mate. It is said that the markings on no two Nebula Dragons will be exactly the same.

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.

Gyunyu Tsubasa, meaning "Milk Wings", is a rather happy dragon who likes to help others and take care of human children at the nearby orphanage, despite the rest of the villagers' protests. When he isn't being chased away by the villagers, Gyunyu is known to fly for long periods at night, with only the company of the stars. He loves to eat small rodents and is known to avoid eating any form of sea food.