They can be any color, though they are usually green. They are giant, glowy, and really really long. They are also dragon-like.
Notable Eternal DragonsEdit
Black Smoke Shenron is the main villain of the dark TRUNKS Saga. He is the Dark COUNTERPART to Shenron and was born from all of the negative energy coming from his wishes. He is the only evil Eternal Dragon.
Shenron is the Eternal Dragon of Earth's Dragon Balls. He was created by Dende.
Porunga is the Eternal Dragon of Namek's Dragon Balls. He was created by Moori.