Introduced during the Dressrosa Arc, 4th Gear is a technique that Luffy learns from his mentor, Monkey Garp, and further develops with the help of his fellow Straw Hat Pirates. This powerful transformation is made possible by Luffy's rubber powers, which allow him to manipulate his body like rubber. By inflating his muscles and bones, Luffy can increase his physical strength and durability, making him a force to be reckoned with on the battlefield.
Ryzen Edit Show all Form Primary Focus Key Features Boundman (Bounceman) Balanced Power The default form; grants immense striking power and the ability to "fly" by kicking the air. Tankman Defense Used against Charlotte Cracker; an immobile, massive form that absorbs attacks and fires enemies back. Snakeman Speed & Agility A slimmer form used against Katakuri; focused on rapid-fire, unpredictable attacks that accelerate the longer they stretch. Limitations and Risks Despite its power, Gear 4 is a "double-edged sword" with significant drawbacks: Reddit Haki Depletion one piece 4th gear
is the culmination of the time-skip training on Rusukaina Island. It combines the inflation mechanics of Gear Third with the speed of Gear Second, while introducing Busoshoku Haki (Armament Haki) as a structural framework. This creates a form that is both armored and highly elastic, solving the issue of Luffy's vulnerability to cutting attacks and lack of offensive impact against Haki users. Introduced during the Dressrosa Arc, 4th Gear is
Moreover, 4th Gear has raised the stakes in the One Piece universe, as Luffy's increased strength and abilities have made him a more viable candidate to take on the World Government and the powerful pirate organizations that seek to dominate the seas. Ryzen Edit Show all Form Primary Focus Key