Stratos Dragons resemble sea dragons, but these massive creatures are far too buoyant to swim in the water. Instead, Stratos Dragons use air mana accumulated in their scales to live high up in the skies from the moment they mature enough to leave the ground, only ever returning to the ground in open spaces or very high elevations to lay their eggs. The underside of a Stratos is covered in reflective scales that slowly shift colors throughout the day to mirror the sky and the clouds above, serving as camouflage. Young Stratos consume anything that will fit in their mouths, and are especially drawn to air mana, but adult Stratos are difficult to observe and not much is known about what they eat or where they continue to gain mana. Corpses of grown Stratos dragons have been found with an incredible amount of crystallized light and air mana embedded in their backs, and it is thought that they fly so high up as they would otherwise be a delicacy to many of the more mana-hungry dragon breeds.

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.

Swimmer's name (in addition to referencing his sea serpent-esque appearance) refers to his unique hobby of hanging around bodies of water, specifically the ocean. Though he won't go in the water, and, frankly, hates getting wet, he has a unique fascination with the ocean and all its residents, be them colorful fish, bizarre aquatic organisms, or sea dragons. He's the direct opposite of his sister, Shrimp, who is obsessed with the sky and seeks to reach great heights. Swimmer will travel from high in the air to the shores of his home to observe the water. He gets along quite well with his fellow serpents, though he is very meek and quiet and doesn't do well with conversation, much like his other Stratos relatives. He's generally friendly and kind-hearted, not to mention a fantastic listener. He's a pure pacifist, absolutely refusing to fight under any circumstances. Unlike his siblings and father, he doesn't participate in defense training, choosing to fly away if ever trouble arises.