Kira Kira no Mi

The Kira Kira no Mi is a Paramecia-type Devil Fruit which allows the user to either encase or transform their body into diamond. It was eaten by Jozu.

Strengths and Weaknesses
The fruit allows the user to transform or encase themselves in diamond, giving them a very tough body as diamond is the hardest substance in the One Piece world, along with Seastone and the Poneglyphs.

However, the diamond does not protect the user from freezing, and the frozen body parts can be shattered regardless of whether they are diamond or not. Besides that, the user is affected by the standard Devil Fruit weaknesses.

Usage
Jozu's fruit gives him the ability to greatly increase his offensive and defensive capabilities, as his already strong physical attacks are enhanced by the density of his diamond body. This power is made even more effective, especially on Logia users, when Jozu uses Busoshoku Haki.

His defenses seem to enhance exponentially, and he is able to block the strongest slash in the world from the world's greatest swordsman, Shichibukai Dracule Mihawk with no visible damage to himself.

Attacks

 * Brilliant Punk (ブリリアント・パンク): Basically a powerful tackle, Jozu rushes towards an enemy at high speed and slams the person with his diamond-transformed forearm, dealing damage and launching the target a fair distance back. This was first seen being used against Crocodile. This technique's name is derived from the diamond cut, "Brilliant". In the Viz Manga and FUNimation subs, its name is the same.

Video Game-only Attacks

 * Cabochon Knuckle (カポションナックル): Jozu's attack exclusive to the game Unlimited Cruise SP. It is a simple punch from the left, with his fist turned into diamond. Cabochon is a type of gemstone cut.
 * Octagon Hammer (オクタゴンハンマー): Jozu's attack exclusive to the game Unlimited Cruise SP. Jozu holds his arms above his head, turns them into diamond, and slams them down on his opponent. Octagon is a type of diamond cut.
 * Dispersion Impact (ディスパーションインパクト): Jozu's attack exclusive to the game Unlimited Cruise SP. While on solid ground, Jozu smashes the ground, grabs a huge chunk of earth, and throws it onto his opponents. So far, Jozu has only thrown ice (he also throws ice in Unlimited Cruise, even when he is not standing on ice). Dispersion is a light phenomenon that occurs in diamonds.

Trivia

 * It can be mistaken for a Logia-type due to the fact that Jozu can willingly transform his entire body into an element, something that distinguishes Logia users from Paramecia users; but it is a Paramecia-type due to the fact he did not reform his arm after it was severed. He also has not been seen producing diamond outside the perimeter of his body, which is one of the common characteristics of Logia-users. This implies that it could be a fruit that grants the user the power to encase himself rather than transforming.