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.

Because Ygicox was left alone as a hatchling, his temper remained similar to a normal Hellfire Wyvern's temper. He is very antisocial and aggressive, roaring at anyone he sees, except when he is hunting and trying to be stealthy. Hatchlings run seeing the sight of him because Ygicox has hurt a number of them, though not severely. He has gotten on the bad side of every parent in his owner's scroll and is constantly being attacked for getting too close. But he knows it's his own fault and just likes scaring and hurting dragons. More friendly dragons have tried to cool Ygicox down, but only got a deadly grin at them and had to turn away.