Fleet Admiral

In the world of One Piece, as well as in many real-world navies, Fleet Admiral (元帥, Gensui) is the highest marine rank. It is just above Admiral.

There is only one Fleet Admiral in the service. He is the supreme commander-in-chief of the Marines.

The only Fleet Admirals seen so far in One Piece is the current one, Sengoku, and Kong seen 25 years ago. They, alongside with the Admirals, are the only ones within the Marine capable of initiating a Buster Call, as well as grant World Government agents the right to do so.