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.

The sound of Flixi's voice is described as a mix between a gravelly screech and a husky growl, yet the scent of the she-dragon is not disputed; a brittle, sharp smell of scorched wood. Her fiery temper matches her smell, and she is quick to jump to conclusions and is just as willing to resort to violence. Her superiority complex means that she often butts heads with her husband, Ja'ald, but she loves him enough to get over these arguments relatively fast. Surprisingly, she has a motherly touch to her disposition, and spends her time in the hatching den, caring for the unborn dragons inside the delicate shells.