When Water Dragons mature, they lose the ability to survive on land, entering the water permanently. They are adept swimmers and eat whatever fish are in the lake they live in. They tend to inhabit the same lake for their entire lives, although a few live in the ocean and swim all over the world.

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.

Cerulean Madame is the only female water dragon in the cave, and she feels a bit left out when the others go on and on about Lilac Lulu. She knows if they take up with her they'll be sorry—and she wishes one of them would just look at her lovely fins. But they don't; fancy hair is all, it seems. So she dreams about leaving the cave altogether and swimming far out to sea in the hope of finding someone who will truly appreciate her. She has made friends with a school of dolphins who are teaching her how to sing to whales. That's very difficult, and she is very afraid of singing the wrong thing and annoying some passing killer whale enough to eat her. Her favourite food is mackerel, with an order of squid on the side—so she has to go out to sea for dinner. But she finds fresh water fish tastes kind of muddy and not pleasant at all.

She also likes to play water polo. Sadly the other water dragons don't, so she has to persuade Lily the Lovely to play—and Lily isn't very good at it.