Monkey D. Luffy's progression throughout One Piece has seen him become one of the most fearsome pirates on the seas. Thanks to the powers of the Gomu Gomu no Mi, Luffy has mastered several powers in the form of gears over the years. Right now, his strongest gear by far is Gear 4, by virtue of which he's defeated the likes of Doflamingo, Cracker and even Charlotte Katakuri.
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Gear Fourth Techniques
Gear Fourth is a technique first seen in Luffy 's battle against Donquixote Doflamingo. Luffy coats his arm in Busoshoku Haki before biting into his forearm. Similar to how he activates Gear Third , he blows an incredible amount of air into his body, but this time he inflates his muscular structure before distributing the air throughout his body, with emphasis on his upper half. When utilizing Gear Fourth, Luffy makes extensive usage of his Busoshoku Haki by coating his arms, legs and much of his torso in it to the point that they turn black from hardening. He also physically grows taller, standing around 4 meters tall. Similar to when using Gear Second , Luffy is continuously emitting steam in this form. Combined with Luffy's rubbery composition and his compressed muscle structure, Gear Fourth both adds explosive power to Luffy's attacks and grants him enhanced defensive capabilities far beyond what he can demonstrate with or without Gear Second or Gear Third. Unlike the previous forms, Gear Fourth focuses on compression more than stretching in a manner similar to the Bane Bane no Mi. He can compress his arms, legs, and head. While the compression grants Luffy's moves overwhelming speed and power, the range of his attacks is severely decreased.
Unlike his other two Gear Fourth forms, Luffy does not significantly expand, with his forearms and legs being only slightly enlarged and the rest of his body retaining its normal proportions. The steam produced from his body also seems to be draped over his shoulders like a scarf while in this form. Luffy compresses his fist and releases it, using Python to change the direction of his punch according to the actions of his opponent. His arm speeds up the more it stretches, and the force of the punch was strong enough to smash Charlotte Katakuri into a wall. Luffy arches backwards and compresses both arms before unleashing a rapid-fire strike, moving his arms up and down to give the impression of multiple arms moving to attack. As with Jet Culverin, Black Mamba involves Luffy changing the direction of his attacks, but their rapid movements make Black Mamba harder to avoid. Luffy compresses his arm, and as he releases it, instead of directly targeting his opponent, he has his arm loop around him once before sending his fist flying at his opponent.
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