Pink Dragons are primarily herbivores and only eat meat during the mating season, when mates will exchange kills. When it is not breeding season, pink dragons spend most of their time incubating eggs and caring for their clan’s young. Due to their feminine color, it was traditionally thought that pink dragons were a strictly female breed, but this is not true.

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.

As the first-born male of the clan, Atreiu looked over every other dragons' births along with his Breeder. He is the father figure of the clan, and by his Breeder's consent he (along with the clan's first-born female Bellodia) is allowed to exert full control over the other members. He is wise and fair; his commands are absolute and are only overpowered by the commands from the Breeder herself. However, if he and Bellodia end up drafting different consequences for the dragon in question, he would usually consent to those of Bellodia's as a sign of honor for a female dragon. He is kind and merciful, but would attack without hesitation if necessary. His seniority blessed him with immense power, and he can take down The Warriors without breaking a sweat.