Deep Sea Dragons, as their name suggests, spend most of their time in the darkest depths of the sea. They have a bioluminescent dorsal spine that serves to attract prey and communicate with their own kind. As with many deep sea animals, they generally eat whatever they can manage to bait. They rarely leave the ocean floor, surfacing only during breeding season. When they do choose to travel to the shallower depths, they avoid bright lights and will only come up far away from shore.

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.

Kirofu's name means deep, as that is where he lives, deep at the bottom of the ocean. As he is the only deep sea dragon in flamedreamer's cave, he is very lonely and wishes there was another salt water dragon to keep him company. Lucky for him, a new deep sea dragon was picked up at the cave recently, and could possibly grow up to live with Kirofu. He loves to swim through the seaweed and exploring seems to be a hobby.