: The most balanced form, focusing on power and defense. Luffy's body becomes spherical, and he is forced to constantly bounce because of the high internal pressure. It allows him to "fly" by kicking the air, similar to the Geppo (Moonwalk) technique.
In conclusion, Gear Fourth is the most mature expression of Luffy’s character in One Piece . It strips away the romanticism of the rubber man and replaces it with a brutal, functional engine of liberation. It is a power that admits its own ugliness, its own fragility, and its own terrible cost. By transforming into a bouncing, muscle-bound colossus who can barely move after a few minutes, Luffy embodies a profound truth: true freedom is not light and easy. It is heavy, exhausting, and often leaves you small and defenseless once the fight is over. Gear Fourth is not Luffy’s ideal self; it is the necessary nightmare he must become so that the dawn of a free world can break. And that contradiction is what makes him a true emperor of the sea. gear fourth one piece
: In the latest arcs, such as One Piece Chapter 1129 , Luffy has shown mastery over this form, allowing him to use it in short bursts or partially transform specific limbs to avoid the massive energy drain. : The most balanced form, focusing on power and defense