Gally

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"Crescent-Moon" Gally is the captain of the Gally Pirates, currently active in the East Blue. He is notable as a character that predates One Piece proper, serving as the main antagonist of the first Romance Dawn prototype. Since then, he has mostly appeared in non-canon portions of the anime (including a loose adaptation of Romance Dawn), though he was eventually confirmed as a canon character by a manga cameo at the conclusion of the Whole Cake Island Arc.