Nobuyuki Masaki, father of Tenchi Masaki and direct descendant of Jurai prince Yosho Masaki Jurai, inherits an extended Juraian lifespan—estimated at 120 to 200 years. He retains a youthful appearance akin to his twenties but uses unexplained methods to publicly present as mid-to-late forties, revealing his true look only during rare events like his wedding. Orphaned young, he bonded closely with Katsuhito’s daughter Kiyone Masaki, who played with him yet subjected him to cruel pranks. Nobuyuki married Kiyone, fathering Tennyo and decades later Tenchi. After Kiyone’s death during Tenchi’s childhood, he raised Tenchi alone while working as an architect. Nobuyuki displays a carefree, less responsible personality than his son, often exhibiting voyeuristic tendencies and actively encouraging Tenchi’s romantic pursuits—efforts that typically backfire. Despite this, he deeply cares for Tenchi’s well-being. Following Ryoko’s awakening and the family’s relocation near the Masaki shrine, Nobuyuki moved to the city, living with his assistant Rea. Their relationship progressed to engagement and marriage. Before the wedding, Tenchi reacted angrily upon learning the fabricated story of his mother Kiyone’s death. Nobuyuki explained the lie stemmed from hesitation over revealing Kiyone’s actual death and her prankster nature. Tenchi reconciled, accepting Rea as a maternal figure. Nobuyuki and Rea later had a son, Kenshi, protagonist of *War on Geminar*. In the *Tenchi Universe* continuity, Nobuyuki married into the Masaki family, becoming Katsuhito’s son-in-law and addressing him as "father." His personality mirrors the OVA’s, though he frequently complains about the long commute from the shrine to his city architecture job. He flirts with his secretary, presenting her bouquets. During *Tenchi Muyo! in Love*, a younger, shy Nobuyuki appears in high school with Tenchi’s mother Achika, expressing affection indirectly through architectural drawings and video recordings. His dream house design from this period became the family’s actual residence. In *Tenchi Forever!*, he files a missing-person report after Tenchi’s disappearance but receives reassurance from Katsuhito about Tenchi’s resilience. Within *Tenchi in Tokyo*, Nobuyuki’s personality shifts: he lacks voyeurism, smokes, and actively prioritizes Tenchi’s welfare, such as withholding train tickets to prevent the girls from following Tenchi to Tokyo. His role here is primarily comedic, involving physical gags. Across all timelines, Nobuyuki consistently works as an architect, designing the homes for Tenchi and the extended family. His Juraian lineage remains constant, though its implications vary slightly between continuities.