Seabook Arno

is a fictional character from the Gundam universe. He is the main protagonist in the Gundam movie, Mobile Suit Gundam F91, and also one of the supporting heroes in the manga, Mobile Suit Crossbone Gundam.

In the Gundam F91 movie, Seabook began as simply an engineering student from the colony of Frontier IV at the Frontier Side (formerly Side 4) and presumingly, a Newtype where by this time, they were long forgotten and became figures of legend. He also bears resentment to his mother, Monica Arno, for abandoning her family to devote herself to her research in the bio-computer being utilized for mobile suits like the F91 ("F" for Formula) Gundam F91.

It has been thirty years of peace following the end of the second Neo Zeon War, where in UC -123, a beauty pageant is being held in the Frontier IV colony. Seabook Arno takes forcefully his friend Cecily Fairchild to appear in the contest, even though she refuses to participate in it; meanwhile Crossbone Vanguard mobile suits Den'an Zon and Ebirhu-S enter the colony and engage the Federation forces stationed there. Eventually, the fighting escalates and soon reaches the civilian areas.

Seabook saves Cecily from getting crushed by a falling mobile suit and along with his younger sister, Rees, join their friends Drosie Mua, Arthur, Georgi, and Sam to head for the mobile suit museum. The museum owner, Roy Jung, wants to fight, using an old Guntank R-44 mobile suit. Georgi and Arthur also join in the fight, but then Arthur gets killed in an explosion. The Guntank damaged the escape route, forcing Seabook and his friends to head for the wharf with the Guntank in order to get aboard a Federation ship. They were blocked by a G-Cannon mobile suit and an officer who wants to use them as human shields. They are then helped by Seabook's father Leslie, who tells them to hurry to the wharf.