Waterhorse Dragons received their name due to their horse-like physique and endearing behavior. They are capable of surviving out of water, and when on land their skin secretes a gelatinous goo to retain moisture. However, their large paddle feet are better suited for swimming, and waterhorse dragons tend to move very awkwardly when on land. Waterhorses are very friendly dragons and enjoy playing with humans.

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.

Nikki was raised almost solely by Young Titan, due to the fact his mother, Yume Nikki, was not only incredibly shy but often driven away by his obsessive aunt, Ying. He does his best to visit her whenever he can, and retains his father's curiosity with the unknown. He seems to get along well with other dragons despite his dubious origins, especially a certain Nocturne dragon.