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.

Harunari is a peculiar dragon. Being a waterhorse dragon means she thrives well in water. However, this dragoness prefers the company of her land-dwelling cousin dragons. She spends most of her time out of the water so she can't miss a thing that her cousins get up to. Harunari loves being fed bread, Dragonica is unsure of why she loves this but continues feeding her the leftovers of her lunches. Harunari gets on fantastically with Watau, despite the dragon being of either an aggressive mood or a quiet one. She brings a light to his life and makes the once grumpy drake play.