Claymorton, originally known as Mack, is a commander of the Smithy Gang and the boss guarding the first Star Piece in Super Mario RPG: Legend of the Seven Stars and its remake. He is a giant pogo stick-like sword with floating eyes and a red-colored, roundish humanoid figure attached to his handles, mirroring the Shymores he commands; in the remake, the humanoid figure is now identified as "Claymorton" and appears completely separate from the sword on which he now rides. When attacking, Claymorton shakes his head. Like the other members of the Smithy Gang, Claymorton is modeled after a weapon (in his case, a shortsword).

(Source: https://www.mariowiki.com/Claymorton)