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.

Sunfyr is the first dragon ever raised in the colony, so he feels attached to it. The oldest of the first brood of four brothers, he commands the entire colony and is in charge of keeping everyone safe. However, being a Sunset dragon, Sunfyr can only protect his colony during the evenings, so he passes that job on to Baleryn during the morning and day. His other two brothers are Viserin and Ghiscare.

Sunfyr is dedicated and loyal. He is fiercely protective of every dragon in the colony. As the colony's king, he sires heirs and rules with justice and grace. He is frustrated by the fact that he is sleepy during the day and has difficulties carrying out his duties during the morning. At night, however, he is exceedingly productive. His wings glow softly in the evening and night with the sun's light that he collected while sleeping during the day.