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.

Zueko is about as easy to deter from a cause as a raging bull. Ill-tempered and with iron determination tinged by cynicism and bitterness, Zueko has been known to erupt with a moment's notice. He has virtually no sense of humor and tends to grow impatient with those who don't say what they mean.

All of this is not without cause though. For as long as Zueko can remember, his half-sister, Azulka, has always been sheer perfection. His mother, Seravesta, was always comparing the duo and even once attacked him, leaving a nasty welt of ebony-black skin which still mars his whole left side.

Zueko has his moments where he is much more like his long-missing father, however. He can be rather compassionate, if given reason. He is also fairly noble; he would never do anything he feels would endanger other. His stead-fast persona makes him a loyal friend and a great ally to have in any conflict.