SnakemanTo defeat the hyper-fast Charlotte Katakuri, Luffy sacrificed the defense of Boundman for extreme speed. Snakeman is leaner and allows Luffy to utilize "Python" strikes. These punches change direction mid-air, accelerating every time they curve. Because the attacks come from unpredictable angles at blinding speeds, they are nearly impossible to dodge, even for those with advanced Observation Haki.
When Luffy activates 4th Gear, his body undergoes a radical transformation. His muscles expand, and his body becomes covered in a network of inflamed, red veins. His limbs elongate, and his joints become incredibly flexible, allowing him to move with enhanced speed and agility. Additionally, Luffy's physical strength increases exponentially, making him capable of delivering devastating blows that can crush even the strongest opponents. one piece 4th gear
Gear 4th represents the peak of Luffy’s "rubber-man" logic before his eventual awakening. It is the moment where he stopped simply reacting to the world and began imposing his physical will upon it, proving that with enough creativity and grit, a "silly" power can become the most terrifying force on the Grand Line. Because the attacks come from unpredictable angles at
"Imagine blowing so much air into your muscles that you become a giant, bouncing, Haki-infused demolition ball. That's Luffy's Fourth Gear—and it changed One Piece forever." His limbs elongate, and his joints become incredibly
The defining characteristic of Gear Fourth is the application of Busoshoku Haki.
Luffy inflates his muscles by blowing air into his arm (not bones like Gear Third). He then coats his entire body with armament Haki, creating a super-dense, hyper-flexible form. The compression from his rubber allows for spring-loaded attacks with massive recoil.
Monkey D. Luffy’s journey in One Piece is a masterclass in creative progression. While Gear 2nd focused on speed and Gear 3rd on raw scale, Gear 4th (Yontago) represents the ultimate synthesis of Haki and Devil Fruit mastery. First debuted during the climactic battle against Donquixote Doflamingo on Dressrosa, this transformation fundamentally changed how Luffy fights, blending the elasticity of rubber with the impenetrable hardness of Armament Haki.