Decalvan Brothers

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

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Abilities and Powers
The Decalvan Brothers have managed to make themselves an infamous reputation in the New World, and have managed to ally themselves with Whitebeard. After Squardo, they are Whitebeard's choice in leading the allies to attack Marineford.

They wear gloves with razor-sharp nails at the end, which are most likely used in battle, similar to Sham and Buchi, the Nyaban Brothers of the Black Cat Pirates, albeit much stronger. In the anime, they were able to fight on par with Vice Admiral Dalmatian to stall him.

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 Squardo, Whitebeard 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 was stabbed by Squardo, 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. In the anime, the brothers dueled Vice Admiral Dalmatian to a stalemate.

When the Blackbeard Pirates launched a barrage of bullets and blades at Whitebeard killing in the process, the Decalvan Brothers were seen crying. Upon the arrival of Shanks and Sengoku calling the war coming to a close, they and the rest of Whitebeards crew left.

Post War Arc
They, along with the rest of the crew attended the funeral of Whitebeard and Ace on a undisclosed location somewhere on the Grand Line.

Major Battles

 * Whitebeard Pirates and their allies vs. the Marines and Shichibukai
 * Decalvan Brothers vs. Marine Officers
 * Decalvan Brothers and allies vs. Pacifistas

Filler Battles

 * Decalvan Brothers vs. Portgas D. Ace and Thatch
 * Decalvan Brothers vs. Vice Admiral Dalmatian

Manga and Anime Differences
In the anime, an additional scene was shown that the Decalvan Brothers fought against Thatch and were beginning to overpower him when Ace joined the fight. The outcome is unknown but it is very likely that the brothers were overpowered by the two commanders because after the battle it was stated that the bounty of Portgas D. Ace was risen again.

In the manga they were always standing together, with one brother partly covering the other one, resembling conjoined twins. In the anime they were always standing further away from each other.

In the anime they were given an additional scene of fighting against Vice Admiral Dalmatian when Whitebeard ordered the allies to backup Luffy; this was not shown in the manga.

Trivia

 * Their name may be derive from the skin conditions Siemens-1 syndrome and Folliculitis decalvans.