Yosho is the first born child to the King of Jurai, Asusa, and the first Queen, Funaho. Yosho is half human and half Jurai. He became the strongest swordman in Jurai by the time Ryoko attack and was inline to take the throne, with Aeka and his Queen. But on that day 700 years ago he chased Ryoko back to earth where they fought x amount of time. After the battle he took all of Ryoko's gem and embedded them into the Master Key(Tenchiken). He then used the sword to imprison Ryoko never to be free again.

Yosho decided to stay on earth rather than return Jurai. Eventually he settled down and marrried and had a child(Achika). he began training her as a swordswoman:P so that he can send her to Jurai to take his place at the throne. But she grew tired of his training and gave it up. When Tenchi was born Yosho saw in him a great warrior and trained him so that eventaully he can go to Jurai. He saw that tenchi had the potential to better him, if given the trainning. There were times when faced with a challenge rather than fight himself, he allowed Tenchi fight so that he would gain some experience and confidence.