Originally, Seabook is an engineering student and thus is well acquainted with the inner workings of many machines and even had the skill to work on mobile suits, despite seeming to have a distaste for them. His piloting abilities are shown when he swiftly and almost unconsciously destroys three enemy mobile suits in the first few minutes of his first engagement, though it is unknown whether this is due to his Newtype abilities, the Bio-Computer aboard the F91, his own natural skill, or any combination of the three.

An engineering student at the Frontier IV space colony, who flees with his sister and friends when the colony is attacked by the Crossbone Vanguard. At the nearby Frontier I colony, Seabook and company find refuge aboard the Earth Federation Forces training ship Space Ark. Seabook is forced to defend the ship by piloting the prototype F91 Gundam F91, and his natural talent as a mobile suit pilot leads the crew to speculate that the young man is one of the Newtypes of legend. Appropriately, the F91's advanced bio-computer is designed by Seabook's mother Monica, whom he bitterly resents for abandoning their family to concentrate on her research work.