Islewan

Isle One is an infamous New World pirate who allied himself with Whitebeard.

Appearance
Isle One is a massive man whose face greatly resembles that of a walrus, with massive teeth and a large chin. He has black circles around his eyes and a scar under his right eye. Long blonde hair flows on the back of his neck from under his metal helmet, he wears a black and red captain's coat and long gloves almost reaching to his shoulders. He also sports an armor consisting of a barrel-like breastplate and shoulder pads, with porthole-like openings on them.

Personality
Not much is known about Isle One's personality. However, since like his allies he refers to Whitebeard as "Pops", and came to Marineford in order to save Ace, it might be assumed that he has a strong bond with the Whitebeard Pirates.

Abilities and Powers
Isle One is a fearsome pirate who has managed to make himself an infamous reputation in the New World, and to ally himself with Whitebeard.

Weapons
Isle One carries around a katana, and it might be assumed that he's proficient in its use.

Past
Some time prior to the current storyline, Isle One became a known pirate in the New World, and allied himself with Whitebeard.

Marineford Arc
When Portgas D. Ace was to be executed at Marineford, Isle One and his crew joined forces with the Whitebeard Pirates to save him. He was seen attacking the Marines out of the bay with his fellow allies, and later managed to enter it.

Major Battles

 * Whitebeard Pirates and their allies vs. the Marines and Shichibukai

Trivia
It is possible that his appearance comes from a zoan devil fruit