Yokozuna

Yokozuna is a giant sumo-wrestling frog, who he was a friend to the legendary shipright Tom until Tom's execution. After that, he would always swim through the waters around Water 7, stepping in the way of the Sea Train to try and stop it. This habit is said to be caused by Yokozuna wanting to become stronger so he won't lose anymore of his loved ones. This habit also caused him to try and stop the Rocket Man while the Straw Hat Pirates, Galley-La Foremen, and Franky Family were travelling towards Enies Lobby, and he ends up helping them in their attempt to get Franky and Nico Robin back. While on Enies Lobby, he is in charge of preventing any government agents from getting into the courthouse, and does well until the Jurors arrive and attack. He is then saved by the giants Oimo and Kaashii, who decide help him guard the courthouse. Yokozuna boarded the sea train with the Franky Family, the Galley-La, and the giants and has since returned to Water 7.

Yokozuna is the highest rank in professional sumo.