Ukyo Saionji served as a sonar technician in the Japan Self-Defense Forces aboard a submarine before the petrification event. This naval experience sharpened his hearing to exceptional levels, which evolved into superhuman auditory perception after his revival in the Stone World. His acute sense detects and locates sounds with pinpoint accuracy, discerns vocal nuances like fatigue or stress, and perceives distant events beyond normal range. His professional background also provided fluency in English, used for covert communication within the Kingdom of Science. Revived by Tsukasa Shishio, Ukyo became one of the Tsukasa Empire's three strongest fighters, valued for his strategic intellect and combat prowess. However, he harbored deep misgivings about Tsukasa's methods, particularly the destruction of adult statues. Adhering to a strict pacifist philosophy opposed to unnecessary killing, this moral conflict forced him to maintain a loyal facade while wrestling internally with guilt over his inaction. He acted as a covert informant, subtly aiding Senku's allies—like providing Chrome with a battery—and meticulously assessed the Kingdom of Science's ethics before joining them. Ukyo formally defected during the Communications Arc upon confirming Senku and Yuzuriha were repairing shattered statues, an act demonstrating their commitment to preserving life that aligned with his ideals. He joined the Kingdom of Science under the explicit condition that no lives be lost in their conflict with Tsukasa. This agreement cemented his role as a key strategist and intelligence operative. His core pacifism persisted; he consistently advocated non-lethal tactics, apologized to animals before hunting, and expressed discomfort with firearms. Even in high-stakes conflicts, such as the Treasure Island battle against Ibara, he prioritized disabling enemies over causing harm. As one of the Five Wise Generals, Ukyo specialized in reconnaissance, security, and sonar operations. His hearing proved vital in critical missions: detecting hidden threats like Kirisame before she attacked the Perseus, identifying the petrification device's voice-activation mechanism, and intercepting enemy communications during the New America City Arc. Despite his aversion to violence, he demonstrated exceptional combat proficiency, particularly with archery. He fired arrows with surgical precision—missing targets by millimeters to corner them unharmed or striking vital objects under extreme pressure, like disabling the petrification device mid-activation to save Ginro. Ukyo participated in all major expeditions, including the voyage to Treasure Island and the journey across South America. Petrified alongside the Kingdom of Science by the Why-Man's global event, Suika revived him three years later. He contributed to founding Superalloy City and joined the team traveling to San Francisco. His linguistic skills and sensory abilities continued supporting the group against the Why-Man, intercepting its transmissions and aiding Moon Mission preparations. His Kingdom of Science relationships reflect mutual respect and ideological alignment. He shared Senku's commitment to minimizing casualties and was frequently amazed by his scientific innovations. With Ryusui Nanami, he bonded over maritime expertise and agreement on non-lethal strategies, appreciating Ryusui's pragmatic support for his pacifism. He maintained a professional rapport with Gen Asagiri, relying on the mentalist's trickery as a preferred alternative to violence. Though calm and reserved, Ukyo gradually displayed more openness and camaraderie after the Stone Wars, while remaining guarded about his personal history. Physically, Ukyo is a slim, toned man of average height (173 cm) with short white hair and blue-green eyes. He typically wears an orange turtleneck tunic, khaki trousers, pointed loafers, and a distinctive paper cap, later replaced by one bearing the Kingdom of Science insignia. His petrification scar, initially undisclosed, was recreated as a mark of loyalty to Senku after the Treasure Island campaign.