Katsuhito Masaki, who appears in the film Tenchi Forever! The Movie, is the grandfather of the protagonist Tenchi Masaki and the keeper of the Masaki family shrine. Within the continuity of this movie, which follows the Tenchi Universe timeline, he is not the centuries-old, ageless being from the original video animations but is instead genuinely elderly. His true identity is that of Prince Yosho, the former crown prince of the planet Jurai and a legendary swordsman. In his youth, he fled his homeworld with his beloved, Haruna, as their love was forbidden due to differing social classes. Tragically, Haruna died from an illness shortly after they arrived on Earth. Grieving but determined to live, Yosho fell in love with a human woman named Itsuki, the daughter of a local priest, and married her. Taking the name Katsuhito Masaki, he assumed the duties of a Shinto priest and raised a family, becoming the father of Achika Masaki, Tenchi’s mother.

In his older age, Katsuhito is a calm, observant, and quietly wise patriarch. He speaks softly and carries an air of gentle authority, having made peace with the long and complicated life he has led. He no longer pursues the political intrigues of the Jurai Empire, having fully embraced his identity as an Earthling and a shrine priest. However, he remains a formidable presence, having passed down his knowledge of Jurai swordsmanship to Tenchi, training his grandson not just in the physical techniques but also in the spiritual and mental discipline required to wield such power. His primary motivation in the film is one of quiet guardianship. He is deeply aware of the dangers that can follow from the past, particularly the threat posed by the villain Kain, a creation of the late scientist Kagato who is obsessed with his deceased daughter, Haruna.

His role in the story is that of an advisor and a source of crucial exposition. While he does not actively participate in the final battle, his previous actions shape the entire conflict, and his wisdom guides the younger characters. He is the one who reveals the full history of Haruna and Kain to Tenchi, helping his grandson understand the nature of the threat they face. His key relationships within this timeline are firmly rooted in his family. He is a loving, if reserved, grandfather to Tenchi and a father figure who watches over his son, Nobuyuki. His past love for Haruna remains a significant part of his history, a bittersweet memory that informs his compassion for Kain's tragic obsession.

Compared to his counterpart in the original OVA, this version of Katsuhito has undergone a clear, natural development. He is not a cunning strategist secretly orchestrating events from the shadows, but rather a retired hero who has lived a full human lifespan, complete with love, loss, and the gradual acceptance of age. He has genuinely aged, reflecting the sorrows and joys of his life on Earth. His notable abilities, while diminished from his prime, are still considerable. He is a master swordsman, and even in his old age, he moves with a grace and speed that belies his frail appearance. He is capable of using Jurai combat techniques and can call upon his Royal Tree, which is rooted at the shrine, demonstrating that his connection to his heritage and power, while quiet, is not entirely lost. He is a man who has traded the glory of a crown for the simple peace of being a grandfather and a guardian of a small shrine on a distant planet.