Green Dragons are also sometimes called “earth” dragons. They usually live deep within caves, and have power over the earth. They are capable of launching boulders at high speeds, and can cause earthquakes by slamming down onto the ground.

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.

Greeni always finds sometime to chat about, and can talk for hours at a time without pause. His incessant banter drives the others up the wall, and after an incident involving Nova, a Leetle Tree, and a certain Black Dragon who's considered the ARBL's dragons' leader, Riku can be heard muttering that Greeni deserves a tree shoved in his mouth, if only to give the rest of them some quiet (not necessarily peace, considering the large amount of pranks). Some of his friends, like Doc and Skipper, don't mind, and can keep up with the conversation, to the amazement of others.

If he's upset, though, he will rant and rage at everyone, screaming and yelling to bring the cave down. For this reason, it's recommended to tread lightly when speaking to him, and not to make any blunt comments; on at least one occasion, Hades learned this the hard way.