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Luffy has developed several specialized forms of Gear 4 to handle different types of opponents:
Unlike Gear 2nd (blood flow) or Gear 3rd (bone inflation), Gear 4th focuses on . Luffy activates this by: gear 4th
The transformation carries severe recoil. Upon expiration of Haki stamina, Luffy expels all remaining compressed air, resulting in a "chibi" form (Mini Luffy). For 10-20 minutes post-transformation, he cannot re-inflate or utilize Haki effectively. This represents a complete depletion of ATP-analogous energy reserves and Haki concentration, forcing reliance on allies—a narrative device emphasizing the Straw Hat Pirates' interdependence. Luffy has developed several specialized forms of Gear
Gear Fourth is impossible without advanced Busoshoku Haki. Luffy coats his expanded muscles in a hardened shell. This serves two distinct purposes: Luffy expels all remaining compressed air



