In a crossover fanfiction, it could be that the power of Devil Fruits from One Piece becomes known in the Dragonball universe. Vegeta, being his prideful self, wants to obtain a Devil Fruit power to make himself even stronger. He travels to the One Piece world and accidentally ends up on the Thousand Sunny. The Straw Hat crew initially see him as a threat but then realize they can help each other. They end up in a big adventure together where they combine their powers to fight a new common enemy that threatens both universes.
Well, in a One Piece and Dragonball Z crossover fanfiction, the art styles are quite different, but that could add to the charm. For example, the colorful and outlandish characters from One Piece would contrast with the more muscular and intense look of Dragonball Z characters. Maybe the Straw Hat crew would be intrigued by the Dragon Balls and their power to grant wishes. They could embark on a journey to find all the Dragon Balls, while also dealing with the likes of Cell or Majin Buu who are interested in their unique abilities.
Zoro and Vegeta would also have a great interaction. Zoro, with his strong sense of honor and his goal of becoming the world's greatest swordsman, would be a worthy opponent for Vegeta. Vegeta would be interested in Zoro's swordsmanship and might even see him as a potential rival. They could have some intense training sessions together, sharing their knowledge of combat and power - up techniques.
Zoro and Piccolo would also make for an interesting pair. Zoro is a master swordsman always seeking to become stronger, and Piccolo is a powerful Namekian with great combat skills. They could have some intense training sessions together, sharing their knowledge of combat and power - up techniques.
Another plot could involve the Devil Fruits from One Piece and the Ki powers in Dragonball. For example, a character could eat a Devil Fruit that gives them the ability to manipulate Ki in a unique way. Or perhaps a Dragonball character accidentally eats a Devil Fruit while visiting the One Piece world and has to deal with the consequences, like not being able to swim.
Luffy and Goku would be an amazing combination. Luffy's carefree and determined nature combined with Goku's love for fighting and protecting the innocent could lead to some really fun and exciting adventures. They could learn from each other's fighting styles, with Luffy being inspired by Goku's Ki - based attacks and Goku being intrigued by Luffy's Devil Fruit abilities.
A Naruto - One Piece fanfiction could explore the differences in their power systems. While Naruto has chakra-based abilities, the pirates in One Piece rely on Haki, Devil Fruits, and physical strength. It would be fascinating to see how Naruto would interact with the various characters in the One Piece universe. For example, how would he get along with Zoro, the swordsman? Or how would he deal with the wily Nami when it comes to treasure? There are so many possibilities for an exciting and unique story.
One common theme is power comparison. Fans like to see how the powerful characters from each series stack up against each other. Another is adventure. Combining the grand adventures of One Piece with the epic battles of Dragonball Z.
For Luffy, I think a Pikachu would be a great fit. Just like Luffy, Pikachu is full of energy and has a really positive attitude. They both are also very brave and not afraid to take on opponents much stronger than themselves. For Zoro, a Scizor would be suitable. Scizor is a strong and battle - hardened Pokemon, much like Zoro with his swordsmanship skills. Nami could be paired with a Meowth. Meowth loves shiny things, just like Nami loves money and treasure.
Sakura would fit in as a strong fighter. Her physical strength and combat training from being a ninja would make her a formidable opponent in the pirate - filled world of One Piece. She could hold her own in battles against pirates or other threats.