Yugo
Yugo is one of the original six Eliatropes, a civilization who existed long before the events of the animated series or game.
The Eliatropes originated on a world far from the World of Twelve, and fled once they were attacked by a spacefaring race known as the Mechasme. After venturing through space for a long time, they landed on the World of Twelve. Yugo and his dragon brother, Adamai, were the adventurous ones of the six, and later on Yugo was named king of the Eliatropes.