Brook/Personality and Relationships

Personality
Brook is an eccentric character with, like the other Straw Hat Pirates, a distinct personality of his own. While he looks like and claims to be a gentleman, he possesses very bad manners such as asking to see ladies' panties (in a mermaids case he asks if they can lend him some money) and waiting impatiently for food (a trait shared by Luffy). Despite these behaviors he remains somewhat polite, usually referring to people using the respectful "-san" honorific. He appreciates the simplest of things from a gesture of kindness, the company of others, and walking in the sunlight after receiving his shadow back.

His reactions to different occurrences can be somewhat extreme, often comically so. For example, when the Straw Hats were alarmed at him for being a living skeleton, he forgets the object of fear is actually himself and also begins to panic. Although he tends to display more extreme emotions at times, Brook has been known to over-relax when he is told to stay calm. He is also very patient, having stayed on his former crew's ship for years, waiting for the day in which he would eventually be reunited with his shadow. However, due to his rudeness, he can also be impatient about things like waiting for dinner to be served. Brook's most notable trait amongst others, however, is that he cracks "skull jokes" about himself being a skeleton complimented with his distinct laughter of "Yohohoho" even if there is no one around to hear him. When Chopper broke one of his jokes by saying what he intended to say beforehand, Brook became temporarily depressed.

Brook is a great lover of music. Whether it be through happy or sad times, music is what generally keeps Brook going. As a result, his love for music often reflects itself in various other aspects of his character such as in his fighting style wherein the names of his attacks are derived from various musical songs and dances. He gave himself a musical theme so noticeable that while he was alive in his first life, he was called "Humming Brook" by the authorities.

In contrast to the other cowardly crew members own fears - Usopp's being out of insecurity, Nami's as a survival instinct, and Chopper's from cautiousness - Brook's fear is more down to Earth; he fears the things that are not normal. An example would be that Brook is easily scared by the ghosts and zombies (despite technically being undead himself). In order to fight the various Thriller Bark Creatures without fear when he encountered them, Brook convinced himself that if he sings while fighting, he wouldn't be afraid of them (though he starts running in fear when he stops singing). This singing while fighting, however, had a side effect of making him seem like a more sinister creature to the zombies - a rather ironic fact due to him being the contrary and the fact the song he sings during battle being one of life and joy than one of ominous threat and evil as perceived by them. Because of this, despite his equal fear he was given the name of "Humming Swordsman" by the zombies and was ironically feared by them in turn. He apparently doesn't like moving fast, evident when he was in the more intense rides at Sabaody Park. Linked to this is moving at high speeds via the Flying Fish Riders flying fish or theme park rides and fighting a Pacifista cyborg there was little chance to win against. Comically, most of these fears are things he himself has the potential to unintentionally cause such as being an almost living skeleton that can run fast, that most people would have little chance to win against.

Before encountering the Straw Hats, Brook was very lonely while floating adrift on his ship and longed for the company of other people. He initially accepted Luffy's offer to join the crew and invited himself over for dinner upon arriving on board the Thousand Sunny just so he could interact with the crew and fill the void that he experienced all those years. Also, while possibly one of the oldest pirates "alive", Brook still retains an air of childishness about him that enables him to behave in a manner similar to Luffy and Chopper, noted by the ease with which he participates in their child-like antics.

His distinct personality and laughter allowed Nami, Usopp, and Chopper question a "guardian" of Hogback's lab, Ryuma, who had Brook's signature laughter and personality. This was because Ryuma possessed Brook's shadow until he was defeated by Zoro, upon which Brook's shadow was returned to its rightful place.

Awkwardly, Brook has a tendency to lack common sense in slightly frantic times. For example, when Luffy falls into the water, Brook (and Chopper for that matter) jumps into the water, despite being a Devil Fruit user himself. He also has tendency to accidentally go on rides that go obviously fast and sit out on slower rides.

Also in the film Strong World, he appears to take offense if someone avoids him because he doesn't have any "substance," later commenting he is like that because he is "dieting".

Brook believes in and has quoted the philosophy "Good things come to those who wait", given the years he spent on the ghost ship, and Laboon's eternal patience.

Crew
The Straw Hats were immediately wary of Brook prior to his initial entry into the crew (save for Luffy, who invited him on-board the Thousand Sunny), but this changes after the events of Thriller Bark. Franky is moved to tears upon hearing Brook's backstory, and the rest of the Straw Hats gain respect for him after hearing about his devotion to keeping his promise to Laboon. Before he officially joined the crew, only Luffy made friends with him, due to finding him hilarious; the two even goofed around in the same manner during their dinner on the Sunny. Despite his obnoxious personality, Brook deeply cares for his crew, going so far to protect Usopp and Sanji from Kuma. His eccentric personality often gets on the crew's nerves, showing no appropriate respect for Nami and even Robin when he asks to see their panties, and makes skull jokes in serious situations which often lead to him being beaten up, even shattering Robin's normally limitless patience. Nevertheless, Brook's sense of irony and music can enlighten an organization as big as the Thriller Bark Victim's Association. Brook calls Thousand Sunny "lion-chan". Also, because they are both swordsman, Brook has formed a respectful bond with Zoro as well. When he saw the latter face off against Ryuma he then proclamied Zoro "cool". He, along with the Risky Brothers, were one of the few who paid witness to Zoro and Sanji's attempt at self sacrifice, though he respected their decision enough not to tell anyone else in the crew.

Friends
In addition to losing our nakama, my face, my body, I've lost it all. Even if we met again you wouldn't recognize me at all in this skeleton form. I don't have anything left but they all said... this head of mine made you laugh...!!! I'll protect this look to the end because I'm coming to see you. I just hope you're waiting at our promised cape...!!!

Brook cares a lot about his afro. Because it is the only part of him that didn't rot away after he died, it means a lot to him. It is the only thing he believes that Laboon would still recognize him by after fifty years. Since it won't ever grow back again should it be cut, Brook is extremely protective of it.

Because of the promise Brook and the rest of his crew made to Laboon, Brook feels obligated to meet up with Laboon in order to fulfill that promise. He feels that Laboon wouldn't forgive them for dying irresponsibly in the Grand Line.

During the two year time skip, Brook became a celebrity and had flourished so much in his career as a music star, that by the time he was seen again in Sabaody, he was ready to conduct his final concert for his hardcore fans before returning into piracy once again. His fans were shown to be quite devoted to him, tolerating the fact that he was a walking, moving skeleton, and were greatly saddened when the Marines publicly declared of the Brook's past identity as a pirate and possible membership in the crew of the Straw Hat Pirates. They were even willing to brush off the attempts of the Marines to apprehend Brook when he announced that he will perform one final song for them to hear.

Enemies
While alive, Brook encountered many enemies during his journey through West Blue and the Grand Line, including the group that killed him and his crewmates. He also received a bounty from the Marines in this time; due to his managers betraying him, Brook's existence as a pirate and affiliation to the Straw Hats is revealed to the Marines and his bounty remains active.

Because of the mess he made five years ago in Thriller Bark, three of the Mysterious Four know how troublesome he is. Dr. Hogback, in particular, greatly fears him, mainly because Brook once had him at sword point five years ago and knew the weakness of the zombies. Only Perona doesn't know of his doings because she was asleep at the time and ignored Kumashi's attempts to wake her. Brook's main enemy from his time on Thriller Bark was Ryuma, the zombie that was animated with his shadow.