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.

His name means "Cloud" in Japanese. He is the son of Yoshii and Jun, and is the result of a fling that they had. He was raised by his mother, and visited his father on a regular basis. He is a fun-loving dragon, and enjoys making others laugh. He had a brief fling with Kiku, which led to their daughter Avaron being hatched. The fling ended, but they raised Avaron together. Kumo also has a terrible knack for getting in trouble though, like getting stuck between the branches of a tree, or eating too much fruit and falling out of the tree. He met his mate Kyoko after he had fallen out of a tree, and right onto her. After apologizing, he asked if he could take her out to make it up to her. She agreed, and one date led to two, which led to more, which led him asking her to be his mate. She agreed, and they've been happily together ever since.