During Luffy's battle with Charlotte Katakuri, it's revealed that he has yet another Gear Fourth form known as "Snakeman". Unlike his other two Gear Fourth forms, Luffy does not significantly expand, with his forearms, legs, and upper torso being only slightly enlarged and the rest of his body retaining its normal proportions. The spread of Haki is slightly more limited, as it does not appear to extend onto Luffy's shoulders and upper body. However, Luffy's hair becomes flame-shaped like his Haki and sticks up. Instead of steam, this form produces a gaseous substance appearing as a mix of steam and fire and like its other counterparts also seems to be draped over his shoulders like a scarf while in this form. His fists also flex differently, with the first knuckles being extended, similar to leopard fist.