A very agile boy of a race called "forest people". he's clothes are made with grass, he wants to get to know various things. his weapons are handmade boomerangs.

He sets out on a journey with a circus troupe to look for his father and to investigate the reason of the unusual change happened in the peaceful forest.

He has the "Protector's Proof", a mysterious acorn type pendant which his father left him.

Protector's Proof emits a light that calls the "Mushiking" which is a mysterious, powerful beetle, to Popo's aid.