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.

Nicoro was found as a hatchling, his mother having "lost" him. Merely after a few days, his trainer found an abandon Nebula dragon egg. Since he was still young, he believed it was his sister when it hatched. He has a strong bond with Nicora. Nicoro is playful and silly, being good friends with Midnight Star Shine since he's his sister's mate. His mate is Flying Fell Flame. Nicoro will look for the pattern on his wings, looking to see of any stars have shifted there so he could shift his. The pattern in his wings is precise, right down to the shine of a star.

Both he and Nicora believe that they are related. Their trainer doesn't have the heart to tell them they're not, for she knows it would crush them both beyond belief. After abandonment, they can't handle that kind of news.