Water Walkers are small dragons that are frequently found around bogs and ponds. While they are flightless, they retain the flight sacs and hollow bones of their airborne cousins. These traits, coupled with their extraordinarily long, webbed toes, allow them to stand on top of calm waters, using their small sails to propel them wherever they please. They spend the majority of their lives on the water, retreating to the tops of lily pads when the waters become too rough to float atop.

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.

Another one of Tommy's water-based dragons. Garthos recieved his name from one of Tommy's favorite sidekicks on a television series. Like Codee, Garthos is Tommy's mode of transportation to and from school.  He is quite shy, often staying in the middle of ponds whenever strangers come to catch a glimpse of him. He enjoys treading on water lilies and giving Tommy rides across the pond to escape from bullies.