One Piece: Luffy's Nine Great Officers, Explained

gamerant.com:

With the recent conclusion of the Wano Country arc, the Yonko Saga of One Piece concluded as well. Spanning across 4 arcs in the New World, namely Zou, Reverie, Whole Cake Island, and Wano, this saga held tremendous importance in the growth of the crew. The end of this saga signifies that Luffy has finally achieved great infamy and power by reaching the position of Yonko, also called the Four Emperors of the Sea.

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The Four Emperors of the Sea are pirates whose reputation precedes them and they are only outshined by the King of the Pirates himself. Their influence is tremendous and they usually control and protect large areas and multiple islands. Expectedly, they also have extremely powerful crews. Luffy managed to obtain this title and become a Yonko, joining Blackbeard, Shanks, and Buggy after the Straw Hat Pirates played a key role in the fall of not one but two Yonko in Kaido and Big Mom. Everyone in the Straw Hat Pirates was extremely influential in this Raid on Onigashima as they aided by defeating the Beasts Pirates crew's All Stars and Tobi Roppo. Now, the crew is officially recognized as a Yonko crew and Luffy's subordinates are known as the Nine Great Officers.

The Yonko crews in One Piece usually follow a very straightforward composition when it comes to the structure of their crew. Under every Yonko is a set of Commanders, sometimes also known as Executives or Officers. While in some crews, they all hold equal authority, others see a division on the basis of how strong and competent they are. One of the former Four Emperors of the Sea, Big Mom was defeated by Worst Generation members Trafalgar D. Water Law and Eustass Kid after the two awakened their Devil Fruits