Ember Dragons have a great affinity for hot environments. While they themselves are not hot to the touch, their tendency to lurk amongst smoldering ashes has caused many to believe they are fire-starters. Their dully glowing markings serve many purposes: acting as a means of identification between individuals, as an important part of mating displays, and as a way of showing aggression. The long, low build of the breed makes them ungainly in flight, and the thick fleshy membranes of their wings hinder them further. As such, it is rare to see an Ember Dragon take to the air. Ember Dragons are also not particularly sociable; females tend to be defensive, whereas males are more aggressive. Once they have settled with a particular group of dragons, Ember Dragons are incredibly loyal and will defend their pack by any means possible.

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.

Tsukoyami is a very childish dragon despite being full grown. She tends to keep to herself when in rather large groups of dragons. When she communicates with a dragon she knows, she tends to tread off on many topics completely unrelated to one another. She considers herself a loner, but values having the company. Her favorite hobby is drawing, but her owner has yet to figure out how she keeps the paper she uses from burning. She loves to eat extremely sweet fruit, and occasionally chases after chickens for a meal. She utterly detests garlic and loves the dark. Night is her favorite time of day as she loves looking at the stars and watching her Nebula companions fly around. Ironically, she fears heights, despite her innate ability to fly. The other dragons consider her a true, and loyal friend. She is proud and fairly stubborn, but often gives in when she's proven wrong.

The one that she considers her true companion and lover is Gexerion, the Shadow Ember.