Ryu Yamada

An elderly sensei, Ryu Yamada has traveled the world and hiked along countless trails in his lifetime. He is one of the few humans to have accidentally stumbled upon Dragon Village, where he befriended the Dragon Elder and became the official human-Dragon liaison to Sakura City. There, he oversees the Dragon Sanctuary and secretly trains Dragons.

In addition to being a sensei, Ryu is also handy with machines and robotics. Having located Diode in a scrap heap, Ryu was able to reassemble the robot in a weekend and gained a useful work partner.

He is currently serving as Tai's mentor. Whereas Kel and Akira left on their own volition, Tai decided to stay with Ryu.