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.

Lester is a rather jovial fellow- some of the other dragons think he has too much air in his head, but he himself claims that, when floating about among the treetops, he  is above all the troubles of the world.  When he is not busy eating, he has a tendency to float about aimlessly, bumping into things, making up silly songs while doing so, and being a general nuisance.  Still, it's hard to be angry at Lester for long.  He is a harmless balloon buffoon without a bad bone in his body- sometimes even going so far as to let the older hatchlings bounce him back and forth like a beachball.