One of the best stories about Brook is his backstory. Brook was a part of the Rumbar Pirates. When they were poisoned, Brook watched his crewmates die one by one. His own death was followed by his soul wandering for decades until he found his body again. This shows his long - suffering and his loyalty to his old crew, which is really touching.
One interesting Brook OC fanfiction could be where an original character joins Brook's crew on a musical adventure across the Grand Line. They might discover new islands with unique musical cultures and instruments.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of One Piece fanfictions, and you can search specifically for ones related to Brook and original characters (OCs).
A cool 'One Piece Brook Crossover Fanfiction' idea is a crossover with the 'Lord of the Rings' universe. Brook could journey to Middle - earth. His undead nature might make him an object of both fear and fascination. He could use his music to soothe or terrify the various creatures he encounters, like the hobbits might be initially scared but then grow to like his music. Also, a crossover with 'Naruto' could be interesting. Brook could interact with the ninja, and his unique abilities would surely stand out among the shinobi.
First, decide which universe you want to crossover with. If it's a well - known one like 'Final Fantasy', research its lore and characters. Then, think about how Brook would fit into that world. What would be his initial reaction? Next, create a basic plot. Maybe Brook is looking for a new musical inspiration in the other world. Start with a strong opening that grabs the reader's attention, like Brook suddenly finding himself in a different, strange place.
There's also 'Dragon - Pirate Alliance'. This fanfiction delves deep into how the Z - Fighters and the Straw Hat Pirates would form an alliance. It explores the different cultures and fighting styles of the two groups. For example, how Vegeta's pride would interact with Zoro's sense of honor, and how Gohan's intelligence could be used in conjunction with Nami's strategic thinking.
The moment when Brook first joined the Straw Hat Pirates was cool. His abilities, like being able to run on water and his swordsmanship combined with his unique skeletal body, made him a very interesting addition to the crew. He also added a new dynamic to the crew with his music - loving and somewhat spooky personality.
They blend the universes by incorporating the power systems. For instance, in some fanfictions, characters might use Devil Fruits while also having the ability to sense and use ki. Also, character interactions play a big role. Luffy's carefree nature might influence Goku's more straightforward approach to life.
One possible plot could be that Goku and his friends somehow end up in the One Piece world. They meet Luffy and his crew. Goku might be interested in the Devil Fruits and their powers. Luffy, on the other hand, would be excited to see Goku's super strength and ki abilities. They could team up to fight a common enemy like a powerful pirate who has also acquired some sort of dragon ball - like artifacts. This would lead to an epic adventure with both the Saiyans' and the Straw Hats' unique fighting styles combined.
One popular theme is crossover, where characters from Dragon Ball Z and One Piece meet and interact. It's really exciting to see Goku and Luffy team up or fight against each other. Another theme is 'what if' scenarios, like what if a certain character had different powers or made different choices.