Sengoku

Fleet Admiral Sengoku (センゴク元帥 Sengoku Gensui), 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.

Personality
He appears to be a proud man, who is loyal to the World Government and never questions orders. He is somewhat baised towards pirates and seems to show displeasement towards at least one of the Shichibukai. He also can't accept any reason for letting a criminal go at all, even on the grounds of moral values. He follows the code of 'Absolute Justice'.

Past Story
He was in the Marines over 22 years ago, while Gold Roger was at large and is named as one of the figures of his day by Whitebeard along with Garp and Roger.

He use to be an Admiral 20 years ago and was the one who ordered the Buster Call to Ohara; he had Sakazuki and Kuzan to led the Buster Call.

It was proven that he is extremely loyal to the World Government and does not like anyone questioning them; he believes that the World Government must always be trusted. He also believes the Oharans were "evil" for breaking the law, and he blindly follows the World Government's orders. He seems to not know that the Oharans don't care about the Ancient Weapons as he seems to be aware that the World Government is actually hiding the real reason to "punish" the Oharans.

He even orders the Marines and CP9 Agents to find Robin.

Present Story
He first appeared when he called in the Shichibukai to discuss the replacement for Crocodile. He told Donquixote Dolflamingo to quit playing his 'game'. He seems to use Tsuru as his assistant and would get information from her.

Current Events (Spoilers)
Recently, in chapter 438 Garp informed Sengoku about Luffy about being his grandson and Sengoku got annoyed and ordered him back to Water 7 to capture Luffy.

Trivia

 * "Sengoku" can be written in kanji as 戦国, meaning "warring states," which is a period of Japanese history.
 * He is followed around by his pet goat.

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