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.

Fujiwara Aoi helps his mother with the Fujiwara ferry service and often nudges humans he has given rides to until they give him something shiny. When the day is done the two dive to shallow waters to their glistening stash. If his charges don't give him something he will make them swim all the way back and give them a hard time about it by sometimes dunking their heads under the water. Aoi is very proud of his speed in the water, and can also be seeing racing any dragon who is swimming near him.