Kirisame

This weapon was the property of Hody Jones, captain of the New Fish-Man Pirates, and its position in the famous-blade hierarchy was never pinned down. Built for undersea combat, the arena where Hody dominated, it is a sharply curved edge with a groove at its base that slots straight onto his dorsal fin, folding his natural shark features into the weapon. A dedicated sheath rode on his back to hold it whenever it was idle.

Fixed over the fin, the blade let Hody wound anyone he swept past, amplifying the predatory build his species gave him. Its edge was ferociously keen, shearing clean through an oarfish that drifted close by and carving into the undersea mountains near him. Hody could also throw himself into fast, repeated somersaults, tearing through the water like a living circular saw, and in the anime the same spin threw out trailing blades of air.

Only Hody Jones ever bore the weapon. When Vander Decken IX moved to smash the ark Noah down onto Fish-Man Island, Hody scaled the chain with the sheathed blade strapped on. In the sea battle that followed, his opponents were Luffy together with the Ryugu Kingdom's four royal siblings, and he raked the fin-blade across them as he darted past. The clash with Luffy ended the weapon's story, since the pirate shattered it. Its name rests on a pun: one spelling reads as a light drizzle or misty rain, while swapping the characters produces the sense of a cutting shark.