Tenchi's Grandfather and "Retired" Prince of Jurai
Katsuhito is the grandfather of Tenchi and serves as a priest at the Masaki family shrine. A number of continuities depict him to be a formidable swordsman despite his apparent age.
In the past, Katsuhito was known as Yosho, the Prince of Jurai born to King Azusa and Queen Funaho. At this time, Jurai recently passed laws that allowed the people to mix their blood with other planets. Funaho was from Earth and appointed as Jurai's queen. This law didn't go well with Juraians as those of half-Juraian blood faced heavy prejudice. Yosho was very upset with these circumstances at a young age as he grew to be very protective of his mother. He would be bonded to his royal tree at eight years old and name it after his mother.
Yosho would go on to have some ordeals with love as he grew up. He found himself growing a romantic interest in his second mother, Misaki, who frequently visited him when he was twelve years old until her mother, Seto, got wind of the developments and persuaded Yosho into attending the Galaxy Academy to prevent a scandal from breaking out. At the Galaxy Academy, he would fall in love with an older student named Airi, whose alien race strongly hated Juraians, as the two would have a child named Minaho. But because these developments would lead to the rivalry between their races to get uglier, Airi was forced to separate from Yosho and had the embryo within her body separated and put in stasis for a period of time until she could reunite with Yosho.
Later on, Yosho was arranged to marry his half-sister, Ayeka. While the arrangement excited the princess due to her love for Yosho, the man only thought of her as a sister. When Ryoko attacked Jurai, Yosho took this opportunity as an excuse to leave the planet (mostly out of his love for Airi) as he pursued Ryoko and made her crash land on Earth. He managed to remove all her gems which were transferred to his sword, Tenchi-ken, and sealed Ryoko in a nearby cave.
After defeating Ryoko, Yosho chose to live a life on Earth. He became a Shinto priest taking the name of Katsuhito Masaki and left Funaho to plant into the Earth soil where it could never be used as a spaceship again. Despite not keeping contact with his parents, Yosho kept frequent contact with Seto and would later marry Airi in a common law marriage. In the present, Katsuhito is Tenchi's grandfather who taught Juraian sword arts to the boy as he desires to send his grandson in his place to inherit the throne on Jurai.
In battle, Yosho can generate a barrier to defend himself from attack and can use Tenchi-ken in battle thanks to his Juraian bloodline. Being a master swordsman, Yosho was an equal match in his battle with Kagato on Earth. Using the power of Ryoko's gems, Yosho was able to sustain his youth over the 700 years he was left stranded on Earth and uses a special barrier to create the illusion of being a much older man, rarely showing his true appearance to others.
In the series, Katsuhito is still part of Jurai's Royal Family and was once being known as the legendary swordsman, Yosho. He is no longer blood related to Ayeka and Sasami, but is still part of the main line of the family to inherit the throne. In addition, Katsuhito is of genuine elder age here instead of being centuries old and secretly not having aged a bit.
Following his defeat of his rival Kagato, Yosho would flee Jurai with his lover Haruna, as the two were forbidden to love one another on the planet due to their differing social classes. Unfortunately, Haruna would die from illness before the two would arrive on Earth. On Earth, Yosho would meet with the Masaki family as he met the family's daughter, Itsuki, and the two would fall in love and later marry to have a daughter named Achika, Tenchi's mother.
Katsuhito would tag along with Tenchi and the girls as they are chased by Jurai and Galaxy Police forces later in the series, where Katsuhito comes to learn that Kagato has returned and took on his identity as Yosho. The two would confront one another at an old Jurai palace as Katsuhito would get severely injured in their fight and would recover after his foe's defeat by Tenchi.
Katsuhito is not of Juraian blood in this series, as he is simply the priest of his family's shrine and an exorcist. Later in the series, he would reveal to Washu that the Masaki family is descended from a line of protectors who guard the Earth from enemy threats with the gems wielded by Tenchi not only being a memento from his dead mother, but power granted to him by the gods to guard the Earth and repel evil. In addition, he commented that Tenchi's kind nature would keep him from killing Yugi, which would appear true when the boy spares her in the finale of the series.
In Magical Project S, Katsuhito and Yosho would appear respectively as Genjuro and Binpachi Hagakure in the show's tenth episode.
Genjuro is the leader of a ninja village theme park trying to prevent it from being turned into a wild west themed park by Nobuyuki Onijigoku.
Binpachi is Genjuro's grandson who joined up with Onijigoku's plans due to loving cowboys. However, he would later rejoin his family's side as Genjuro protected him from getting shot by the Love Love Monster, Gunman Girl.
After Gunman Girl's defeat, Genjuro convinces Onijigoku that they can collaborate together with a theme park mixing wild west and ninjas. But to teach his rival a lesson for his misdeeds, Genjuro would tie up Onijigoku and his assistant to the front entrance of the wild west park as punishment.
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