One common theme is the clash of combat styles. For example, when Zoro crosses over to a world like Naruto's, his swordsmanship clashes with ninjutsu. Another theme is adaptation. Zoro has to adapt to new environments, like if he's in a world with different magic systems or cultures.
Blackbeard would probably be very interested in the magic in the Fairy Tail world. He might try to steal some of the powerful magic items or learn magic for himself. He could see the mages as a threat to his plans if they oppose him, but also as potential allies if he can manipulate them. He would likely use his cunning and power - hungry nature to his advantage in this new world.
One interesting aspect is the character interactions. Characters like Goku and Luffy, who have such different personalities but similar heroic traits, coming together. Goku's pure - hearted love for fighting and Luffy's determination to protect his crew can lead to some great dialogue and storylines. Also, the different settings of the two series being merged. The vast ocean - based world of One Piece and the various planets in Dragon Ball Z create a whole new backdrop for the crossover fanfiction.
If Naruto met Newgate in a fanfiction, Naruto would likely try to understand Newgate's world view. Naruto is all about protecting his friends and village, while Newgate has his own code among the pirates. They could end up having a philosophical discussion about power, loyalty, and the meaning of family. Naruto might learn about the complex relationships in the pirate world, and Newgate could be intrigued by Naruto's ninja skills.
One interesting plot could be Blackbeard traveling to an alternate universe where the roles in the One Piece world are reversed. For example, pirates are the law - enforcers and the Marines are the outlaws. Another plot could involve Blackbeard teaming up with a character from a different anime in a crossover event. Maybe he partners with Naruto to search for a powerful treasure that has somehow ended up in the Naruto universe. A third plot could be Blackbeard losing his powers and having to start from scratch in a world where all the other One Piece characters have forgotten who he is, and he has to regain his status and power in a new and unexpected way.
Well, a really cool plot for a Percy Jackson - One Piece crossover fanfiction might involve the search for a powerful and mythical treasure in the One Piece world that has a connection to the Greek gods. The Straw Hat Pirates and Percy's gang could be on a race against some evil force, like a powerful sea devil or a dark sorcerer, who also wants the treasure. Percy could have some knowledge about the treasure's origin from his Greek mythology background, which would be super helpful.
Typically, one of the main plot elements is the clash of different power systems. For instance, the Semblances in RWBY and Devil Fruits in One Piece. This often leads to interesting battles and strategic thinking.
One idea could be that the Straw Hats end up in the Naruto world and have to team up with the ninja to fight a common enemy. For example, they might face a powerful demon that can only be defeated with both Devil Fruit powers and ninja jutsu. Another idea is that some of the Naruto characters get Devil Fruits. Like Naruto getting a Logia type fruit that allows him to transform into a powerful energy form, similar to his Nine - Tails chakra mode but with new abilities.
Well, for a One Piece Doflamingo crossover fanfiction, we could think about a crossover with a fairy - tale world. Picture Doflamingo in a world of Snow White and the Seven Dwarfs. He would be the ultimate villain, trying to take over the magic of the fairy - tale land. He could use his powers to control the dwarfs and try to capture Snow White for his own dark purposes. Another option is a crossover with a superhero world. Doflamingo could be a supervillain who has to face off against a group of superheroes, and his unique powers would make for some very interesting battles.
Well, Akainu could cross over into a fan - made version of the One Piece world where the Yonko are all united against the marines. He finds himself in the middle of this conflict and has to decide whether to side with the marines who he used to be a part of or join the Yonko for some self - interested reasons. He could also have a change of heart during this crossover and start to see the pirates' side of things, which would be a huge character development for him considering his strong stance as a marine in the original story.