In Avatar: The Last Airbender... There are four nations. Fire, Water, Earth, and Air. In the video and the game... Sora\Ven=Air, Kairi\Aqua=Water, Riku\Terra=Earth, Heartless\Nobodies\UEM=Fire. Imagine the Avatar as Neutral or Light. Then in Avatar and KH... Three of Nations\People (Earth, Air...