First Mate

A First Mate (副船長) 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. They answers only to one person on a ship, the captain.

Essentially, the first mate is the one officer the captain must put full trust in and pick carefully. They are the captain's right-hand man and if the captain is not at hand on the ship or is otherwise incapacitated, 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 of.

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 the Buggy Pirates to the Foxy Pirates this crew role is a common sight. There are some cases where larger crews have used other systems of management such as the "Division" commander rank used in the Whitebeard Pirates, likely as a result 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.

List of Known First Mates

 * Benn Beckman (Red Hair Pirates)
 * Mohji (Buggy Pirates)
 * Jango (Black Cat Pirates)
 * Sarquiss (Bellamy Pirates)
 * Okome (Hokahoka Pirates)
 * Silvers Rayleigh (Roger Pirates)
 * Corto (Amigo Pirates)

Trivia

 * 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 ability close to Luffy's. However, he has never actually been called this title, though he was referred to as "second in command" in the Sabaody Archipelago arc.

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