Master Funen

He's the master of Trios' most known mountain, and it's also Kai's and Rin's mentor. He is an extremely powerful fighter, despite his weird and innocent appearance. It was revealed in later episodes that he was actually Geki (激), the past GC of Trios, who was cursed by Hyou and transformed into that brown little mole in a blue vase. He manages to get back to his original form every 50 years, and he taught Baku the techniques Kiwame and Chouka.