Brook (ブルック), known as the "Gentleman Skeleton", is a pirate inhabiting the Florian Triangle region of the Grand Line. He loves to tell odd, bone-themed jokes, as well as melodramatic tales, and is very perverse, asking to see Nami and Robin's underwear upon meeting them. He's a skilled musician, fond of playing the violin. Due to his light weight he can not only jump to incredible hights but can run on water by moving his legs furiously. He uses a shikomizue as his main weapon; with it, he is able to make swift attacks that the enemy cannot notice. The reason why Brook keeps living on and protecting his afro from being cut is that he made a promise to Laboon 50 years ago. He promised that he would return to him and play the violin which Laboon loves as much as he loves Brook's afro. He also believes without the afro, Laboon would not recognize him.
Long ago, Brook ate the Yomi Yomi no Mi. Up until when he died, he simply was unable to swim. A few decades before he ran into Luffy, he and his crew set sail in the Grand Line, but left one of their friends behind- the whale Laboon. Brook and the crew promised to return, but he and his crew were massacred in the Florian Triangle. Thanks to his Devil Fruit, his soul was able to wander until he found his body. He revived, and was determined to return to the Cape of Good Hope and fulfill his promise to Laboon by telling him of the crew's fate. However, due to the heavy fogs, his soul wandered for a year, and by the time he found his body it was only a bleached skeleton. The roots of his hair were as strong as ever, so he still had his afro as a means for Laboon to recognize his new skeletal form. Unfortunately, he's unable to regrow his afro, and thus protects it until he can finally be reunited with Laboon.
Five years before meeting the Straw Hats, he found his way to Thriller Bark, where his shadow was stolen by Gecko Moria and used to revive Samurai Ryuma. Because of this, Brook is unable to exist in sunlight, as he would immediately perish. During his time there, he learned that throwing salt into the zombie's mouth would purify it because salt is part of the sea, so it breaks the hold of Moria's devil fruit power. He used that knowledge to kill many zombies before he was faced off by Ryuma himself and beaten. He then pleaded to spare his afro and be able to escape, and Ryuma let him, because he would die too if Brook did. After meeting the Straw Hats, Luffy asks him to join his crew. Although overjoyed by the invitation, he later declines as his curse prevents him from leaving the Florian Triangle. They soon stumble upon Thriller Bark, and Brook becomes determined to retrieve his shadow. Luffy, determined to help Brook retrieve it, has the Straw Hats follow.
Brook was last seen fighting with Ryuuma to win back his shadow. Despite having grown stronger over the past 5 years, Brook's vow to protect his afro gives Ryuuma a serious advantage, as it is difficult for Brook to guard it and fight Ryuuma evenly. Ryuuma then subdues him, & prepares to cut off Brook's afro. However, an earthquake caused by Oz disrupts Ryuuma. Franky then bursts into the room & guards Brook as Zoro faces off against the zombie.