Decalvan Brothers

The Decalvan Brothers are two infamous New World pirates who allied themselves with Whitebeard.

Appearance
The Decalvan Brothers both have wide faces (though one of them is wider than the other) and flowing black hair. The one with the wider face has sharper teeth. Each brother opens one of their eyes, and closes the other the has a scar over it; which eye they open and close are opposite to one another.

They both wear a pirate tricorn hat with polka dots bandanna underneath it. The hat bears their Jolly Roger: two skulls and a cross-bone, with a wavy design over it. They both wear gloves with razor-sharp nails at the end in both hands.

Abilities and Power
The Decalvan Brothers have managed to make themselves an infamous reputation in the New World, and have managed to ally themselves with Whitebeard. After Squad, they are Whitebeard's choice in leading the allies to attack the Marine warships. They wear gloves with razor-sharp nails at the end, which are most likely used in battle, similar to Sham and Buchi, the Nyanban brothers, of the Black Cat Pirates.

Marineford arc
The Decalvan Brothers and their crew are first seen, along with a fleet of 42 other infamous pirate crews, allied with the Whitebeard Pirates, attacking Marineford to save Portgas D. Ace from his execution.

After failing to reach Squad, Whitebeard has contacted the Decalvan Brothers and gave them, along with certain other captains, the command of all the New World pirates in retaliation to Ace's early execution time.

After Whitebeard got stabbed by Squad and the subsequent dialogue revealed that Squad was actually the traitor and not Whitebeard, they were seen commenting on how ashamed he must be feeling.

They were later seen among the group of New World captains who were backing up Luffy and Ivankov on Whitebeard's orders.