4 | When Does Luffy First Use Gear

: Similar to Gear 3, he bites into his forearm—but instead of his bones, he blows air into his muscular system while utilizing Haki to maintain the form's high-tension elasticity.

Monkey D. Luffy first uses Gear 4 during his climactic battle against in the Dressrosa Arc . The transformation officially debuts in: Manga : Chapter 784 , titled "Gear Four". when does luffy first use gear 4

: Episode 726 , titled "Gear 4! The Phenomenal Boundman!". Key Details of the Debut : Similar to Gear 3, he bites into

: The first variation shown is Boundman (or Bounce-man). In this form, Luffy inflates his muscle structure while coating his arms, legs, and torso in Armament Haki , which gives him immense power and the ability to "fly" by kicking the air. : Similar to Gear 3