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.

Fukuremashita Fukubu, as a Balloon Dragon, was named after the Japanese words meaning "Bloated Belly." She often just floats about, reaching for fruit and leaves. Her belly is so big it looks like she might pop, which would never happen due to her tough skin. Fukuremashita Fukubu is a little shy and doesn't like to make friends. She occasionally talks to dragons that pass by her but other then that she is alone. She suffers badly from Rupophobia, fear of dirt, which is why she is never seen on the ground. If Fukuremashita Fukubu does have to get out of the sky, she lands on trees or rocks, scared of ever touching the ground.