Hellfire Wyverns are so named for their foul tempers and fiery visages. Their social structure places all females above all males, due to superior physical characteristics and violent dispositions. Forced subservience of the males causes them to become vicious, petty, antisocial, and passive-aggressive compared to the aggressive and social females. However, orphaned hatchlings raised by foster parents of another species can develop surprisingly even tempers and mellow dispositions, proving that their defining unpleasant nature is, in fact, a learned behavior.

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.

Gym Coach is an exercise instructor to overweight dragons who want to shed a few pounds. She does not engage in niceties: she tells everything like it is and is rather tactless, although she barks out compliments once in a while. Many students become success stories and spread the word about their new health and vigor and of their instructor, Gym Coach. However, a few leave the regime rather early. Whether it's the teacher's nastiness or their own laziness or business with other things doesn't matter. To Gym Coach, they're quitters. She often says that the road to health is paved with good intentions, but intention is meaningless if not followed through.