Dragons are creatures with nearly unlimited life spans. They can survive for long periods of time, and no one has found a dragon that has died of old age. Adolescence 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. Once they hit adolescence, hatchlings change quickly, maturing to their full forms in only 2 years.

Dragons don't communicate with each other verbally, but they will growl to scare off predators and frighten prey. Young dragons will emit an extremely high-pitched squeal when they are frightened. To communicate, they use telepathy with each other and to speak to other creatures.

Red dragons are similar to typical story book dragons. They shoot flames, can fly, etc. However, they aren't evil creatures as depicted in myths and won't go around raiding castles, killing knights, or kidnapping princesses. They live in a variety of habitats, from forests to coastlines to abandoned castles, usually in warm climates, and eat whatever living creatures they can find.

Tsu' is short for Tsunami. A-chana knew that a name with water-related meanings would not work out well for a dragon that kept setting random objects on fire, however, and uses the nickname almost exclusively. Tsu' is extremely emotional, although some of the other dragons joke she has only two moods: Dangerously furious, and obliviously chipper. This isn't to say Tsu' is a bad dragon to be around. Tsu' is the 'little sister' to them all, even though she's older than some. She's loyal to the others, and if the situation ever called for it, she'd give up her life for them. She may act like she hates them sometimes, but in reality, she loves them all dearly. It's her family, after all.