I know G3 is kinda dead at this point, but I had this idea, so why not post it. The following is a pitch for the folk legend of how Mangai was founded.
Long ago there lived two matoron. One of earth and one of air. Both were great warriors, and bout sought out new lands to conquer. The warrior of earth was a mighty and beautiful young women. The warrior of air was a powerful and striking young man. Soon the two crossed paths. They met in a land that was filled with fire and rock. Both exclaimed at the same time that from then on the land belonged to them. When they heard each other's shout, they lifted their heads and saw one another. Both wished to claim the land for themselves, so they fought over it. Some say that the two warriors battled for days, others say for weeks, and some even claim that they fought for years! But, during the battle, the two found love for one another, and realizing that one would never triumph over the other, they called for a truce, something which neither of them had ever done in their life. Then the pair fought together, killing many of the vile beasts in that land, ridding it of all evil. It is said though, that they never could track down the devious Fire-spitter, for it had stayed cowering in it's cave, not willing to come out and fight. After they had made the land a safe place, they gave it a name, Mangai and had a son, who became the first Mangaian. What are the names of the two ancient warriors you ask, none other than the great Papu and Rangi!
Keep in mind that this is an ancient legend, so it may not make a ton of sense as most legends don't. But, as always C&C is appreciated.