Kachi Kachi no Mi

The Kachi Kachi no Mi, also known as the Kachi Kachi Fruit, is an anime only Paramecia type Devil Fruit that allows the body of the user to be rock hard and heat up body temperature. "Kachikachi" is the Japanese onomatopoeia for stones knocking one another to create fire. The fruit was eaten by Bear King.

Usage
Bear King's one named attack is Hot Boiling Special (ホット・ボイリング・スペシヤル), where he heats his fist up and punches the enemy.