Monkey D. Luffy has some wild transformations in One Piece, but no official appearances could be really considered "dark" until this reveal.
Game Rant on MSN
One Piece Author Eiichiro Oda Reveals Luffy's New Gear Transformation In Latest Work
Oda has unveiled his draft for a secret Luffy Gear. This new Gear design is far darker than Gear 5 in One Piece.
Comic Book Resources on MSN
Every character who can use Gear 5 in One Piece
Monkey D. Luffy isn't the only One Piece character who can wield the ridiculous powers of the Gear 5 transformation.
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