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.

Luffy, like his mother, loves traveling the seas and oceans of the world.  Unfortunately for everyone else living in Phantom Valley, Luffy has aspirations to become the Pirate King and wrecks havoc at various important marine strongholds—sometimes without even meaning to.  Despite how his mother and the valley leader Phase try to dissuade him, Luffy is all too delighted when his bounty rises and cares not that marine headquarters has listed locating Phantom Valley, Luffy's hometown, on their priority list.