Mao is the leader of the Jurals. Mao is distinct from the Jurals in that his skin is grey as opposed to purple, has three eyes, and has a distinct-looking chin.

Spoiler

Although the final goal of the Jurals is to take over Earth and gain its resources, he has helped Ken at least once for the sake of Earth, as seen in episode 11 where he helps Ken pull a comet away from earth.