First Mate

A First Mate (副船長, Fuku Senchō) is the top officer on board a ship after the Captain. Mostly, they may fill a number of roles from checking stock to making sure everyone else is doing their job on the ship. He answers only to one person on a ship, his captain.

Essentially, the first mate is the one officer the captain must put full trust in and pick carefully. He is the captain's right-hand man and if the captain is not at hand on the ship or something has happened to him, the First Mate is the next in line to take over the captain's job. In history there were a few incidents where the First Mate killed the captain to take his role, cases like these were rare but not unheard.

The first mate's mainly responsible for the vessel's stability and cargo operations. They supervise the crew and are also responsible for the safety and security of the ship, as well as the welfare of everyone on board. Additional duties include maintenance of the ship's hull, cargo gears, accommodations, the life-saving and the firefighting appliances. The first mate also trains the crew on various aspects like safety, firefighting, search-and-rescue, and various other contingencies.

On most vessels, the Chief Officer and First Officer (or First Mate) are synonymous, but passenger vessels often carry a separate First Officer who is junior to the Chief Officer.

One Piece
Most pirate crews have a first mate. From Buggy to Foxy this crew role is a common sight. There are some cases where larger crews have used other systems like "Division" commander as seen in Whitebeard's crew, prompting a hint of the sheer size of the crew. While the captain is regarded as the strongest crew member, the first mate is regarded as the captain's champion, or their crew's second strongest, so to speak.

On the Straw Hat Pirates, some people believe this position belongs to Roronoa Zoro as Luffy referred to him as his 'champion' and 'partner' early on in the series, and because Zoro has a fighting power equal to Luffy's. However, he has never in the Japanese manga actually been called this title so far, however he was referred to as "second in command" in the Sabaody Archipelago arc. Also, he usually fulfills the duties of one and often takes charge when Luffy isn't around, sometimes even when Luffy is there. Seeing that Brook was appointed captain of the surviving half of the Rumbar Pirates, he might have been first mate of his old crew. The same might also be true of Jinbei, since he was appointed captain of the Sunny Pirates after Fisher Tiger's death. Also, Bepo of the Heart Pirates seems to have command over the newcomers to the crew, so he might be first mate.

List of Known First Mates

 * Benn Beckman (Red-Haired Pirate Crew)
 * Mohji (Buggy Pirates)
 * Jango (Black Cat Pirates)
 * Gin (Don Krieg's Pirate Armada)
 * Sarquiss (Bellamy Pirates)
 * Okome (Hokahoka Pirates)
 * Silvers Rayleigh (Roger Pirates)

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