Sunset Dragons are closely related to sunrise dragons. However, their behaviors differ greatly. Sunset Dragons generally live alone or in small packs. They are more active in the evening, hunting and performing all of their daily tasks as the sun sets.

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.

He got his surname since, like Taiyo, he did actions telling his cavemates that the night was coming soon. He usually kind of sleeps but since almost always there are hatchlings in the cave playing around and making sound, he is most of the time in a semi-concious state until sunset comes in which he starts to look for food, explore, or just watch the cave and it's surroundings. He and Taiyo interact with each other a lot since when he goes to sleep when morning is coming Taiyo is already waking up the others giving them time to interact, after some time developing a brotherhood bond.