Daydream Dragons are the hosts of daydreams and fantasies. They spend the majority of their time sitting on clouds, dropping daydreams down into the minds of people passing by. Humans who live near Daydream Dragons must be especially careful not to let their thoughts wander, or they could end up spending hours or even days in a trance-like waking dream state.

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 given name is Ken, but everyone calls him Flash Ken. This nickname arose because of the way he flits like a shadow across the sky.

Flash Ken is a Daydream dragon who is always caught up in his own fantasies, so he doesn't say much. In fact, to be precise, he never says anything at all. Some of the dragons think he's mute, or perhaps deaf. Others believe there's something wrong with his brain, and he can't understand language. However, he responds to sound and seems to understand when someone uses telepathy to speak with him.

Thus, most dragons agree he is simply the taciturn type, and they leave him to his own devices, which suits him just fine.