Dragons are creatures with nearly unlimited life spans. They can survive for long periods of time, and no one has found a dragon that has died of old age. Adolescence 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. Once they hit adolescence, hatchlings change quickly, maturing to their full forms in only 2 years.

Dragons don't communicate with each other verbally, but they will growl to scare off predators and frighten prey. Young dragons will emit an extremely high-pitched squeal when they are frightened. To communicate, they use telepathy with each other and to speak to other creatures.

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.

Saito lived a very ordinary life for a dragon of his typing until he found himself in the domain of the young magi dragon Louise. Saito, a once proud male black dragon, was forced to submit to Louise's every desires, mostly despising her cruelty to him. Although she does not treat him well, Saito has fallen for the strong-minded sorceress and wishes to please her. He has not forgotten his strength however and will protect Louise from any danger, using his innate knowledge of any outsider's weapons against them. Saito never wished to be with Louise in the past, but now he is closer to her than any other dragon in the cave, even when her spell craft fails and blows up in his face.