Kai

カイ

Kai is the Great Child of the 3rd World, Trius, and his Spirit is named Bakuzan (バクザン). He is a martial artist who specializes in staff combat and is a disciple of the enigmatic Master Funen, who was cursed by the Needle Tower.
Kai has admired En since childhood, after En rescued his village from a giant Troublemaking Monster known as Taurus. He forms a trio with Baku and Pink, and the three embark on a journey to the Needle Tower. Kai also possesses a giant purple flying ray named Manta, which serves as his Monster-Guide.