Seabook Arno is the main protagonist of Gundam F91, and childhood friend of Cecily Fairchild. During an incursion of his native colony by the vile Crossbone Vanguard, he takes up arms in the cutting-edge F91 Gundam to fend off the insurgent pirates.
After the Cosmo Babylonia Uprising, Seabook chooses to join forces with Cecily, now using her birth name of Berah Ronah, and lead a reformed Crossbone Vanguard under the alias of Kincade Nau, at the controls of the Crossbone Gundam X-1.
