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Professor Sato, whose full name is Hayao Sato, is a supporting character in the animated film Ultraman: Rising. He is the estranged father of the protagonist Ken Sato and is regarded as one of the world's foremost experts on kaiju. Beneath his public identity as a distinguished scientist, he is the human form of the previous Ultraman, the silver giant who defended Earth before his son took up the mantle, and he later returns to action under the name Ultradad.

His background is defined by the tension between his two lives. As a younger man, Sato balanced his work as a researcher with his duties as a protector of Earth, and his young son Ken initially looked up to him with admiration. However, the demands of being Ultraman kept him in Japan while Ken and his mother Emiko moved to the United States, and this long separation created a lasting rift between father and son. The rift deepened after Emiko's disappearance, an event for which Ken came to resent his father. By the time the film begins, Sato has sustained a serious injury and lives in seclusion, having asked his son to take over the responsibilities of Ultraman.

In personality, Sato is characterized as thoughtful, knowledgeable, and quietly burdened by regret. He carries guilt over the way his commitment to his heroic duties came at the expense of his family, and he is aware that his son's resentment is largely a response to his absence. He is also gentle and paternal in his interactions with those he cares for, showing patience and warmth once he and Ken begin to reconnect.

His motivations center on protecting the world and guiding his son toward an understanding of what it truly means to be Ultraman. He is driven by a strong sense of duty, but also by a deep desire to mend his relationship with Ken and find redemption for his past failures as a father and husband. Rather than seeking to reclaim the spotlight as a hero, he wants to support his son and ensure the legacy of the Ultra is carried on responsibly.

In the story, Sato serves as a mentor and a source of wisdom for Ken. Their relationship remains tense and distant for much of the film, with Ken initially refusing his father's help. That changes when Ken accidentally injures the infant kaiju he has been caring for and finally contacts Sato for assistance. Sato heals the young creature and names her Emi after his missing wife, then becomes an important figure in helping raise her, taking on the role of a grandfather figure to the baby kaiju.

His character development is closely tied to the theme of parenthood. As Ken struggles with raising Emi, he begins to understand the difficulties his own father faced, and the two reconcile during a visit to the family cabin. Sato learns that Ken's drive for success grew out of a need for his father's attention, while Ken comes to appreciate the sacrifices his father made. Later in the film, Sato is injured during an attack by the Kaiju Defense Force and must be placed in a healing tube, but he ultimately recovers enough to transform into the original Ultraman once more, saving Ken in the climactic battle over Tokyo Bay. His return as Ultradad represents the mending of their relationship and his willingness to fight alongside his son rather than stand apart.

Among his notable abilities are his transformation into a giant Ultraman, his extensive combat experience as a seasoned hero, and his deep expertise in kaiju biology. He also possesses substantial knowledge of the history of the Giants of Light, the origin of the Ultra powers, and he is skilled enough in healing to treat Emi's injuries. His scientific mind, tactical experience, and hard-won understanding of what it means to protect others all contribute to his role as both a father and a hero.