Nebula dragons are nocturnal creatures. With the best eyesight to be found, they are often seen staring into space. Each dragon tends to observe a particular nebula and will eventually change their colors and patterns to match it. As the nebula changes over time, the dragon changes with it. The more intricate the design of the nebula, the better chance an individual has of attracting a mate. It is said that the markings on no two Nebula dragons will be exactly the same.
Mimas's slightly larger than average frame intimidates some at first glance. However, he is quite gentle and loves hatchlings. His playful and energetic nature wins him many friends, but some can't stand how childish he can be. However, at times when he is alone, especially when he observes his nebula, he can transform into a deep thinker. His mate, Asterperigra, shares his love of hatchlings and they both want a big family eventually.