Moonstone Dragons are named after the orb on their tails, which resembles the gem of the same name. They are nocturnal and gather energy through the absorption of moonlight with their orbs. They seem to glow with a lunar light and are a very gentle breed, feeding off of plants and the moons’ power.

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.

Arianna is kind and friendly, but tends to judge others very quickly. She has a short temper and doesn't care what others think of her. She was very outgoing but after her father died she locked herself away from the rest of the world. She's very close to her brother Tony, and after meeting Professor Layton she realized that the townspeople are nice and made friends with dragons her age. She is very close with Luke.