Unlike his previous forms, Gear Four renders Luffy unable to stand still. He must constantly bounce, utilizing the stored potential energy to launch attacks at speeds previously impossible for his size. This "bouncing" nature makes him a difficult target to hit and allows him to change trajectory mid-air, a feat that baffled opponents like Doflamingo.

His muscles began to swell and grow, his skin turning a deep shade of red. His limbs lengthened and thickened, taking on a grotesque yet powerful appearance. Luffy's face elongated into a snarling visage, his eyes blazing with a fierce inner light.

Gear Four serves as a turning point in One Piece for several reasons: