Sichibukai

The Shichibukai the full title being Ōka Shichibukai (Royal Seven Military Seas), are seven (reduced to four after the Battle of Marineford) powerful and well-known pirate captains who have allied themselves with the World Government.

The Shichibukai is an organization of seven former pirates turned privateers in the service of the World Government. Although they work for the World Government, the Shichibukai do not care about or respect the Government (excluding Bartholomew Kuma, who was transformed into their puppet) or even other Shichibukai, and are often considered by the Marines to be no different from any other pirate. On the other hand, they are known as "government dogs" and are despised by other pirates, but are still feared and respected for their infamous reputation and strength before, and even after they become Shichibukai.

The Shichibukai seem to be a mixture of the more chaotic Yonkou and the more orderly Marines. There is an enormous range in the bounties between the members due to differences in circumstances under which they were recruited, with Donquixote Doflamingo, who has the highest known former bounty of the Shichibukai at 340,000,000, Hancock with a comparatively low bounty of 80,000,000 (however this was her starter bounty, so far the highest known) and Blackbeard, with no former bounty at all.

The majority of the Shichibukai are composed of New World veterans. Those who have met the Yonkou or even confronted them.

The terms that the Shichibukai are on with each other is best described as very unstable. They practically have very little (if any) respect for each other and will for the most part not accept help from one another, apparently from a firm sense of pride. During the battle meeting for the Shichibukai where only two members are absent (Hancock and Jinbe) it is even stated that the very notion of them working together as a team is entirely unthinkable. However Kuma and Doflamingo don’t disregard the notion of teaming up with another Shichibukai: Kuma offered Moriah help defeating the Straw Hats and Doflamingo offered Crocodile a chance to team up. Both offers were refused due to pride.

During Boa Hancock’s visit at Impel Down’s Level Six, Jinbe stated that he didn’t know much about her, possibly suggesting that only some of the Shichibukai are familiar with each other or even have personally met all the other members. Despite this as of chapter 575, all of the Shichibukai (including former) fought at the war between the Whitebeard Pirates and the Marines.

Most of the Shichibukai have a jaded attitude of the world, as their vast amounts of experience have disillusioned them. Crocodile and Moriah both disregard Luffy’s arrogant behavior, saying that he is too inexperienced to know what the world is truly like; Mihawk behaved in a similar fashion in his duel with Zoro. Doflamingo believes that there is no true justice in the world, and that both the Marines and Pirates are foolish if they think that they are upholding it. Hancock, through her horrid experience as a slave, considers all men of the world to be scum, outside of Luffy with whom she is in love, Rayleigh who is her "benefactor," and Fisher Tiger who was responsible for freeing her from slavery.