Zabine Chareux is the commander of the Crossbone Vanguard's elite Black Vanguard squadron and a supporting antagonist in Mobile Suit Gundam F91.
After Berah Ronah was captured and taken back into the Ronah family to be used as a figurehead for the Cosmo Babylonia, Zabine was the one tasked with training her to pilot a Mobile Suit. Zabine soon grew close to Berah, seeing her as a worthy leader of Cosmo Babylonia.
Zabine and his Black Vanguard squadron later participated in the invasion of the Frontier I colony. During the fight, Zabine piloting his Berga Gilos fought Seabook Arn in his Gundam F91. Zabine's mecha was heavily damaged in the fight, forcing him to withdraw from the battle to get a new mobile suit.
However, Zabine wound up having to instead spend his time searching for Berah Ronah, who had defected from the Crossbone Vanguard to be with Seabook.