"Koki! Don't slack off... Focus!"
Personality: Katsuhito/ Yosho is usually pretty calm in nature. He is very wise and when training Koki displays a stern side. He tends to look pretty serious but is quite gentle.He likes to joke about sometimes. His sense of humor is usually cloaked in his cool disposition. He likes to watch as the people around him develop and grow in their relationships.
Yosho is the eldest child of Juraian Emperor Azusa Masaki Jurai born to the first of his two wives, Funaho. He is the Grandfather of Koki Oyamada. Because his mother was from Earth and was under a lot of heat from the people of Jurai because of her heritage, Yosho stood in a very difficult position since birth. Though half of the members of the Jurai palace were benevolent to her, others took the position of being neutral or critical to her. Yosho was always apprehensive of Funaho and if he found any chance, he tried to stay with her as much as he could. He believed that was the only way to help and protect her in his father's place as he was busy with his official work. When Yosho was eight years old, he was bonded to a first-generation Royal Tree like his father, which made him second in line for the throne. He named his tree, Funaho.
Yōshō had a marriage arranged with his half-brother Aiba, but at the time, not all Juraians liked the idea of mixed blood heritages as he is part Earthling on his mother's side. So, when Yosho took on the space pirate Ryuichi during his massive attack on Jurai, he used it as a perfect excuse to slip away. Yosho used his Master Key called "Tenchi-ken (Sword Tenchi)" to do battle with Ryuichi. However Ryuichi escaped.
Yosho relocated and lived on the planet Earth where his tree took root and sustained his life. He took the name of Katsuhito Oyamada and started a family while becoming the caretaker of the Oyamada shrine. He had a son Nobuyuki and then his grandson Koki. He lives at the shrine under the guise of an old man and works as a Shinto priest.
Character Theme: Hiromitsu Agatsuma – Solitude http://youtu.be/B7u9ugjMO0U
Other: He intends for Koki to take his place as heir to the throne of Jurai someday. He also still harbors feelings for Prince Aiba, but he is interested to see how Koki feels about Aiba.