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.

Rouge's egg was traded for by the Castle Master, and almost hand-raised by the human. As such, she was a vicious yet loyal hatchling, though her controlling nature almost always ended in a spat between her and the castle's leader, Edin. Despite this, she would take orders without a second thought, and this was a very much beloved trait in a hatchling. When she finally matured Rouge was enlisted to watch over the castle grounds. However, this wasn't her only task. When the sky is black and no moon shines overhead, the large Royal Crimson is seen slinking into the dungeons, disappearing for hours on end. It is unknown by most what she does, but when she finally returns at dawn a malicious smirk is plastered on her face and a stomach-twisting chuckle rumbling from her throat. None dare to ask what she was doing, and those who do know have never so much as whispered a word about it.