Lumina Dragons received their names from their highly reflective scales, which—at times—seem to glow. They are vain, always strutting about and preening incessantly; if one of their scales has so much as a scratch or a defect, they’ll remove it. Luckily, their scales grow back quickly, and each new growth is more beautiful than the last. These narcissistic dragons live in small groups and prefer to surround themselves with beauty. The females guard their territory and eggs while the males search for vegetation to eat.

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.

"What is that--what's that--hey look at that thing! No, that other thing! Ewww, what's wrong with your legs--hey, look at that! Wow, that's cool! Hey, that thing has runes on it! You look familiar. Hi! What is THAT--Ooh, guess what's in the box...hey, look at THAT!"

Curiosity, like Space, is a hyper, ever-talking dragon. He is oddly curious about everything, and will often question every dragon in the cave. These questions usually include what things are and why other dragons' legs look 'weird'. He also has a habit of stating things about objects.

Rick and Wheatley have never liked Curiosity. A better way of putting it might be that Rick flips out whenever Curiosity comes near him, and often resorts to throwing lemons at the Lumina. Wheatley believes that Curosity, like Space and Chell, has brain damage.