One idea could be that the Akatsuki members are transported to a world full of magic. They have to adapt their ninja skills to this new environment. For example, Sasori might find new materials to create his puppets, and Deidara could be intrigued by the different ways to create explosions in this magical world.
Perhaps they end up in a world where there are different factions like in their own world, but with different powers. The Akatsuki could be seen as either a threat or a potential ally. They might start by trying to understand the power dynamics and then decide whether to work with or against the existing groups.
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.
One idea could be that Zoro ends up in a world full of magic. He has to learn to adapt his sword skills to combat magical creatures. Maybe he teams up with a local wizard who helps him understand the new world's rules while he teaches the wizard about honor in battle.
Perhaps Goku lands in a world where the inhabitants are all pacifists. He has to find a way to protect this world from an external threat without using his usual brute force, which could lead to him developing new skills. Also, he might find himself in a world with a different concept of time, which messes with his ability to power up in his usual way.
One idea could be Naruto arriving in a world full of magic, and he has to learn to combine his chakra skills with magic. For example, he might use his Rasengan with a magical spell to create a super - powerful attack.
Another plot could be that Vegeta lands in a world where time moves differently. He might age at a much faster or slower rate. This would add an extra layer of complexity as he tries to figure out how to get back to his own world while dealing with the changes in his physical state and the relationships he forms in this new world.
Maybe in this other world, Ichigo discovers a group of people who are similar to the Soul Reapers but have different powers and a unique hierarchy. He could get involved in their internal conflicts and help bring peace while also trying to find a way back to his own world.
One idea could be that America is in a world where magic exists. The government has to adapt to regulate magical powers. Another could be a world where America is the only non - technological nation and has to rely on old - fashioned ways while other countries thrive with advanced tech. And perhaps a world where America is split into multiple kingdoms and there's a power struggle between them.
Well, a plot could be Naruto is on a mission to infiltrate the Akatsuki, but he starts to understand their motives which are not entirely evil in some aspects. For example, some members might have joined because they were persecuted by their own villages. Naruto could then try to find a middle ground between the Akatsuki and Konoha, to create a sort of peace deal. This would be a really different take on the Naruto - Akatsuki relationship compared to the original story.
One idea could be Sakura infiltrating the Akatsuki to gather information for the Hidden Leaf. She might start to understand the motives of some Akatsuki members and question her own village's view of them.
One idea could be Naruto joining the Akatsuki but secretly working to reform it from within. He could try to change the views of members like Hidan and Kakuzu by showing them a different way of life. Another plot could involve Naruto being sent on a mission by the Akatsuki that makes him question his loyalty to the group. For example, if the mission is to harm innocent people, Naruto would have to find a way to complete the mission without actually causing harm.