Gaia and Eywa are both spirits of nature on their respective planets, and they don't save the world directly. Captain Planet and the Na'vi are both blue and want to protect the environment. * Cap is only six-feet tall, has green hair, and a man-shaped body. Perhaps Cap & Gaia are the Id & Ego of Eywa? * He's an immature Na'vi. * Oh so Gaia gets killed at some point.