Royal Crimson Dragons are so named due to their massive size and confident, regal bearing. Most of the time they are laid back, ignoring non-prey creatures smaller than themselves, although they will occasionally take fresh kills from other dragons as a reminder of their place in the social order. Although there are few other dragons large enough to pose a threat to Royal Crimsons, they have little tolerance for potential rivals and will fiercely defend their territory from such intruders.

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.

Grezire has no desire to breed with other Royal Crimson Dragons, just for the natural caution during mating season. He's seen other males of his kind get killed and sometimes eaten by their female counterparts, which has caused him to have PTSD, and to cope with that, whenever it's mating season, Grezire will only search for females of other breeds. More specifically, smaller, more submissive female dragons, such as the ones he's mated with so far. He especially seems to like Mibirith and is often quite fascinated by her ability to heal and to just avoid violent acts in general. He gets a bit annoyed with her desire to make deals every time she's needed to heal someone's wounds, but he would much rather have that than putting his life in danger.