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In One Piece, Luffy is the only character who categorizes his various forms using gears. Here

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Monkey D. Luffy/Abilities and Powers, One Piece Wiki

All Luffy's Forms In One Piece (Pirate King, Sun God)

One Piece: All of Luffy's forms, explained

All Luffy's Forms In One Piece (Pirate King, Sun God)

One Piece: Biggest Drawbacks Of Gear 5th

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Luffy's Gears in One Piece, ranked by overall strength

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When does One Piece take place? - Dexerto

Live-action One Piece: What arcs does the Netflix series cover? - Dexerto

Monkey D. Luffy- Gear 12 Crew Mantle by Nectp on DeviantArt

One Piece: The true powers of Luffy's Gear 5 explained - Dexerto

The 'One Piece' Episodes Where Luffy Gets Each of His Gears, Explained

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