Mistlet Pygmies thrive in humid environments and are most content when frolicking in the rain or fog. The cheerful demeanor they exhibit provides a remarkable contrast to their shadowy appearance, bringing joy in otherwise gloomy environments. Mistlets are an especially beautiful sight in long summer evenings, as their streak of vibrant scales catch the fading sunlight. They spend a great deal of their time foraging for edible roots and insects, and sometimes enjoy treats in the form of small fish or frogs.

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.

Pygmy dragons are the smallest category of dragons, being on the same scale as domesticated animals. They are often found around concentrated populations of dragons, relying on their larger brethren to ward away potential predators and leave scraps. As such, the majority of a pygmy’s diet is scavenged. Due to their tiny size, pygmies do not breed with larger varieties of dragons.

Due to her small size, which reminds that of a child, Isa has been given the epithet "Ryuukosei" or translated in English, "Dragon Child Star".

She is a dragon who loves to be among others, especially with other Pygmies or hatchlings. Her behaviour is able to cheer up sad or unfortunate people, giving them hope. It is also known that she loves to play tricks on the dragons who are taller and bigger than her. However, no one dares to harm her as she is very loved by everyone. Her plays are not ill-natured anyway. Therefore, most of the dragons are not angry with her to begin with.