Up until this point, Luffy had been using Gear 2 and Gear 3, but Doflamingo’s "Awakened" Ito Ito no Mi (String-String Fruit) abilities proved too versatile and durable. Realizing that his current strength wasn't enough to protect his friends and the citizens of Dressrosa, Luffy reveals that he spent his two-year timeskip on Rusukaina developing a new technique to combat the massive monsters on that island. What Makes Gear 4 Unique?
726 Chapter: 784 Arc: Dressrosa Context: Luffy first uses Gear Fourth against Doflamingo after realizing his regular attacks (including Gear Second and Third) aren't enough to break Doflamingo's string-based defenses and overcome his awakened Devil Fruit powers. when is gear 4 introduced
True to Eiichiro Oda’s writing style, this massive power boost comes with a heavy price. When Gear 4 is introduced, we quickly learn its fatal flaw: it exhausts Luffy’s Haki completely. Once the timer runs out, Luffy is left physically depleted and unable to use Haki for ten minutes, leaving him completely vulnerable—a plot point that added immense tension to the final moments of the fight. Impact on the Series Up until this point, Luffy had been using
: He coats large portions of his body in Armament Haki , which allows him to maintain a rubbery flexibility even while hardened. 726 Chapter: 784 Arc: Dressrosa Context: Luffy first
When Gear 4 is introduced, it introduces a concept called (Muscle Balloon). Unlike Gear 3, where Luffy blows air into his bones, Gear 4 involves blowing air into his muscular structure while coating his limbs in heavy Busoshoku Haki (Armament Haki). This creates "Boundman," a form that:
This form, known as Boundman (or Bounce-Man), involves Luffy blowing a massive amount of air into his muscular structure, combining his rubber physiology with the defensive power of Armament Haki (Busoshoku). This gives him a bouncy, spring-like quality that drastically enhances his attack power and speed, allowing him to utilize the "Python" technique to change the direction of his attacks mid-air.