Brook is the musician of the Straw Hat Pirates. He is a skeleton the Straw Hats found on board a ghost ship after drifting into the Florian Triangle. He is a Devil Fruit user who ate the Yomi Yomi no Mi and is an undead being brought back into a pseudo-immortal state because of its powers. He is the ninth member of the Straw Hat crew and the eighth to join Luffy's crew. He is also one of the two swordsmen onboard their current ship with the other being Zoro. He fills the role of the long awaited musician that Luffy wanted for his crew since his journey began.
Brook is an extremely tall skeleton dressed in formal attire complete with top hat and cane. At 8' 8.5" in height, he is the tallest member of the Straw Hat crew. Despite having no skin, he still has an afro which he says is because his hair has very deep roots. Brook's style was that of a gentleman consisting of a coat, top hat, trousers and afro, which are black, while the inner linings of his coat were yellow-orange. The cravat that was tied in between his coat and around his neck was blue. The outer covering of Brook's cane sword which he carries was purple. Also, due to his many years of seclusion his clothes were somewhat tattered.
However, after two years, he has changed to more colorful and high-end clothes, as though to represent a rock star. He has heart-shaped sunglasses, a yellow feather boa, a top hat with a giant crown on the brim and orange red trousers with a floral design.
In his previous life, Brook had gained a bounty of 33,000,000 for piracy. This bounty and the picture accompanying it were issued fifty years ago. After the timeskip, Brook's managers sell him out to the Marines, allowing them to connect Brook's skeletal appearance to the picture in the wanted poster. They also learned of his connection to the Straw Hats.
Brook's dream is to return to his crewmate Laboon, whom his former crew, the Rumbar Pirates, had left behind at Reverse Mountain for his safety, with the promise to return after crossing the Grand Line. He wishes to fulfill that promise to Laboon, as well as that of his former crewmates, who died at their journey, to deliver their final song recorded in a Tone Dial before their death.
Brook, who has replaced his gentleman-style outfit with rockstar clothing, has gained notoriety as a famous musician with the title of "Soul King". He has learned the true nature of his Devil Fruit, allowing him to put his body back together if the pieces get separated and to separate his soul from his body (acting like a real ghost by astral projection, though he can still be seen by others in his soul form) and can "bring the very cold of the underworld" improving his Fencing Style with freezing effects. He also improved his musical ability, imbuing it with the power of his own soul, and that of his Devil Fruit's ability, to the point where he can even hypnotize people and make them see illusions. His swordsmanship has also improved, as he can now use "flying slash" techniques, and he is now strong enough to cut through one of the dragons on Punk Hazard, whose body and scales are said to be stronger than steel, implying that he can now cut through steel as well.
While a cover story is given to the general public to explain Robin's initial bounty, the actual reason is because the World Government sees her ability to read Poneglyphs as a threat to world safety. After joining up with the Straw Hats, however, the government's view of her becomes more genuine.
• First bounty: 79,000,000 for sinking six Buster Call battleships (in truth, for her ability to read Poneglyphs
• Second bounty: 80,000,000 for her involvement with her fellow Straw Hats in the Enies Lobby incident (her wanted poster also gains a new picture)
Robin's dream is to find the Rio Poneglyph which tells the True History of the One Piece world including the Void Century, continuing the research of her mother Nico Olvia and her old mentor Clover.
Robin no longer has bangs and her hair is much longer but still with straight styled hair. It is pulled back with a pair of sunglasses resting at the top of her forehead with small strands of hair falling from the upper left & right corners of her forehead. Her skin tone is much lighter than before, suggesting that not only was her previous darker tone a tan from spending so much time in sunny regions, (especially Alabasta, due to its desert climate), but also that she has spent much of the past two years getting little sun at all, either due to a climate of less sun, or because she was inside buildings or underground for much of the time. She has mastered her Devil Fruit powers to the point of being able to generate thousands of parts (generating gigantic limbs) of her body and even able to bloom her entire body, thus cloning herself.
While his gang's involvement in the invasion of Enies Lobby is overlooked, Franky's own involvement with the Straw Hats is recognized. Along with burning the blueprints for Pluton and defeating Fukuro of the CP9, Franky is recognized as a threat by the World Government and is given a bounty of 44,000,000.
Franky's dream is to create and travel with a dream ship which would experience countless battles, can overcome extreme hardships and can reach the end of the Grand Line. He has created the ship which the Straw Hats are riding and it's his task to keep it in good condition. Previously, one of his dreams was to beat Spandam to pieces, fortunately this was fulfilled toward the end of the Enies Lobby Arc.
Franky has used the technology from Dr. Vegapunk's research lab to develop a bigger and more advanced body (adding a "BF-37" tattoo to symbolize the latest and greatest model, Battle Franky 37), his bulky arms with oval shape were replaced for square ones, and he installed a device in his nose to control his hair. He now usually goes with a shorter, buzz-cut hairstyle, but can revert to his old style or change to a new one. His arsenal has increased in firepower as well; he now has rocket launchers and a laser cannon (similar to that of Pacifistas and Kizaru's Devil Fruit) at his disposal. He can also fight inside a robot that he developed.