One common theme is the clash of cultures. The ninja - like Akatsuki with their own values and traditions coming into the very different wizarding world of Harry Potter. Another theme is power struggles. Akatsuki members are often power - hungry in their own universe, and in the Potter world, there are different power dynamics with the Dark Lord and the Ministry of Magic.
Another interesting crossover could be with 'Sailor Moon'. The Sailor Scouts could join forces with Yona's gang. Yona could learn about the power of friendship and magic from the Scouts, and they could work together to protect both their worlds from a new, menacing threat.
One idea could be that a Naruto character gets accidentally transported into the Akatsuki's hideout. They then have to figure out how to get back while avoiding being captured or worse. Another could be a scenario where an Akatsuki member has a change of heart due to an encounter with Naruto and his friends, and decides to help them instead. Maybe a joint mission where Naruto and the Akatsuki have to team up against a greater threat that endangers both their worlds.
Definitely Kisame Hoshigaki. His shark - like appearance and water - based abilities could be really interesting in a crossover with the Pirates of the Caribbean world. He could be a fearsome sea creature that the pirates have to deal with. Also, Deidara would be a good choice. His love for explosions could create chaos in a crossover with the world of James Bond. He could be a new kind of terrorist threat that Bond has to stop.
A great plot idea is to cross Akatsuki with the world of Fairy Tail. The Akatsuki members could be seen as dark guildsmen. They might try to steal Fairy Tail's magic or fight against the guild's most powerful wizards. Their abilities in the Akatsuki world would be a new and dangerous threat in the Fairy Tail universe. This would create a lot of exciting battles and character interactions.
In a crossover with 'Fullmetal Alchemist', Edward and Alphonse Elric would be ideal. Edward's hot - headedness and Alphonse's calmness could play off well against Yona and her group. They could exchange knowledge about alchemy and Yona's world's unique powers.
For Naruto characters in the crossover, think about how they would react to the Akatsuki's presence. Naruto might be more cautious but still retain his optimistic nature. Sasuke could have a more complex reaction as he has his own dark past. For Akatsuki members, show their motives more deeply. For example, Itachi's love for his brother could be explored further in the context of this crossover. Maybe he tries to protect Sasuke from other Akatsuki members.
One popular one is 'The Akatsuki in Hogwarts'. It has an interesting plot where the members of Akatsuki find themselves in the wizarding world of Harry Potter. They bring their unique powers and personalities, which creates a lot of chaos and also some unexpected alliances. Another is 'Akatsuki's Magic Adventure at Hogwarts' which focuses more on how they adapt to the magical rules and customs in the school.
Well, you could do an Akatsuki crossover fanfic with the world of 'One Piece'. Picture the Akatsuki sailing the Grand Line, having to deal with pirates and the Marines. They might be interested in the Devil Fruits for their own purposes. Or you could cross them with characters from 'Fullmetal Alchemist'. The Akatsuki could be intrigued by the concept of alchemy and try to use it for their plans. Also, consider a crossover with 'Attack on Titan'. The Akatsuki facing the Titans would be quite a sight, and they might find new ways to use their powers in that world.
First, decide which other universe or story you want to cross the Akatsuki with. Once you've made that choice, research both the Akatsuki and the other world thoroughly. Then, come up with a basic plot idea. For example, if you're crossing with 'Harry Potter', maybe the Akatsuki are after a powerful magical artifact in Hogwarts. Next, create some initial character interactions. How would Sasori react to seeing a wizard use magic? After that, start writing your first draft, don't worry too much about making it perfect at first.