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.

Galaxy Blu set eyes on a large blue nebula when she was still a young hatchling. Her often gazing into the night sky has attracted the curiosity of Staramu, a dark pygmy dragon who felt like the odd one out when he too was young. At night, they are found resting upon the top of the hill in which "Sharz Cavern" is based. Galaxy Blu has been known to fly out into the sky, as high as she can, for a closer look at her chosen nebula.