Balloon Dragons are so named because they are filled with a gas that makes them almost lighter than air, similar to balloons. However, they are not prone to bursting, as they are covered in tough skin and can deflate themselves if necessary. In addition, they generally are slow moving. They use their gas bladders to float to the tops of trees, where food is more abundant. They can shift their weight from their backs to their fronts, allowing them to reach leaves and fruit.

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.

Bviur loves to bounce. He loves to hop. He loves to jump. He loves to fly! Sometimes Bviur spends days just bouncing. Up, down, up, down, all the time. The other dragons watch him and get headaches.

Bviur, other than bouncing, loves to eat. He wastes so much energy bouncing, he has to eat at least a deer a day. Most Balloon dragons look "large" because they have massive air sacks. This is also the case with Bviur, but on top of that he has a good layer of fat which makes him much ... larger than the other dragons. Most dragons laugh at his ambitions to mate, which is cruel. This, unfortunately, makes Bviur mad. Then he bounces faster.