Jozu

"Diamond Jozu is the commander of the Whitebeard Pirates' third division.

Appearance
Jozu is a big, gruff, heavily armored man. The armor he wears is similar that to a samurai, with bolted shoulder pads. Jozu has a long face with stripe-like patterns for a beard and hairstyle. His legs are relatively thin, in comparison to his muscular arms. He appears to look angry and battle-hardened, and keeps his arms crossed at most times.

Abilities and Powers
As the commander of the third division of the Whitebeard Pirates, Jozu has authority over the lower-ranking subordinates.

Like Marco, Jozu was capable of retaining consciousness from Shanks' powerful Haki.

Devil Fruit
Jozu apparently ate some sort of Devil Fruit that allows him to turn his body into pure diamond. In this form, he seems to be invulnerable to all slashing attacks, including those sent by the world's greatest swordsman, Shichibukai Juracule Mihawk, which could even slash through Don Krieg's flagship with one stroke. This power has earned him the nickname "Diamond" Jozu.

This fruit is most likely a parmecia because he can't shoot out his diamonds and he doesn't dodge attacks like most logia types.

Jaya Arc
Like Marco, Jozu first appeared as a background character, but unlike Marco, he did not get any dialogue. It wasn't until later, that he gets identified by name and role in Whitebeard's crew.

Post Enies Lobby Arc
Like Marco, Jozu displayed a knowledge of what would happen when Shanks boarded their ship and commented on how Shanks' spirit was as strong as ever.

Marineford Arc
Jozu shows up at Marineford with the rest of the Whitebeard Pirates and their allies from the New World, in order to save Portgas D. Ace from execution. Including him and Marco, all other division commanders are ready to battle. When Mihawk, the greatest swordsman in the world, made a massive slashing stream at the Moby Dick, Jozu easily stopped it by becoming diamond, effectively stopping the strongest sword in the world.