Black Dragons are warriors. They are strong and capable in battles of force, but also ample magic users, capable of devastating opponents with their spells. Their bright eyes give them excellent night vision, which is why they generally hunt during the night.

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.

His name means Black Darkness in Dutch. Zwart is an extremely dark and morbid character. His pessimism sometimes bothers the other dragons because he is always complaining about something. He is easily angered or upset. He does not have a mate for no female has been able to stand his personality long enough to get close to him. He cannot stand bright or girly colors, and he despises Momoiro Ojousan, who is a pink dragon. The other dragons can't help but laugh whenever Momo tries to flirt with him.