Kachi Kachi no Mi, One Piece Wiki

The Kachi Kachi no Mi is a non-canon Paramecia-type Devil Fruit that allows the body of the user to harden and heat up their body at will. It was eaten by Bear King. Kachikachi is the Japanese onomatopoeia for stones knocking against one another to create fire, a reference to the heating up power of the fruit. Kachikachi can be the sound effect of something hardening, another reference to the powers of the fruit. This fruit allows the eater to harden the body at will, increasing their defensive

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