When Water Dragons mature, they lose the ability to survive on land, entering the water permanently. They are adept swimmers and eat whatever fish are in the lake they live in. They tend to inhabit the same lake for their entire lives, although a few live in the ocean and swim all over the world.

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.

As the only male water dragon in his pod, Castor has grown up to be a very feminine dragon. It's actually to the point of his being suspect of various odd activities. The rumors are all bogus of course—especially the one about him playing for a different team—but Castor doesn't actually bother to try and remove these, as that would bring up a whole slew of different issues. Namely, staying comfortable in his own skin and with his home pod.