Sinii Krai Dragons are known for their love of fish and their strong personalities. They are able to travel both in the air and in the water with their unique tails. They live on the coast in groups of ten or more and are fiercely territorial. Sinii Krai Dragons are nearly impossible to tame if not obtained at an early age. Great care must be taken around them as their skin is highly poisonous after maturity.

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.

Seikaku likes fish, but dislikes confrontation. This means that she attempts to hunt stealthily, so other dragons don't notice the locations of her food sources. Most of the time, she hunts in large bodies of water, staying below the surface and trying not to cause any unnecessary ripples that might give away her presence. If she notices anyone trying to hunt in the same place, Seikaku will attempt to grab as many fish as she can carry, even if she can't eat all of them at once, and take off before the other dragon even realizes she was there.