Sengoku

Fleet Admiral Sengoku (センゴク元帥 Sengoku Gensui), nicknamed "Sengoku the Buddha" (仏のセンゴク Hotoke no Sengoku), is the supreme commander of all Naval forces in the One Piece world, his status apparent by the life-size seagull attached to his hat. He oversees the workings of the Marines from his base in the Sanctuary of Mariejois, though he is subordinate only to the leaders of the World Government, the Five Elder Stars (Gorōsei). He also has a pet goat, it is possible he might have a Devil fruit power, as he is not only the leader of every Marine, and the fact that some of his Marine subordinates have Devil fruit powers, such as Smoker, Hina, and Aokiji. It's also possible that he may have access to Devil Fruits and gives them to subordinates that are deemed worthy.

Note: "Sengoku" can be written in kanji as 戦国, meaning "warring states," which is a period of Japanese history.