Another plot could involve Hibari getting involved in the Akatsuki's plans. Maybe he initially misunderstands their motives and gets caught up in their activities, only to later realize their true nature and try to stop them. This would bring a new dynamic to the Akatsuki's story.
Well, in Naruto fanfiction, Hibari Kyoya could be an interesting addition. He might bring in his unique combat style and personality. Maybe he could be a visiting ninja from another village, interacting with Naruto and his friends in unique ways. For example, he could have some sort of rivalry with Sasuke due to their different approaches to power.
He might become more lenient. In the Naruto world, there is a greater emphasis on teamwork and friendship compared to his original world. So, he could gradually soften his strict and solitary ways as he experiences the bonds that the ninjas form.
Hibari Kyoya could be a mentor figure in the Naruto fanfiction. He might teach Naruto some new techniques or ways of thinking that are different from what he has learned from Kakashi or Jiraiya. This could open up new storylines about Naruto's growth as a ninja.
One interesting plot could be Naruto, now in Obito's body, trying to prevent the Uchiha massacre. He could use his knowledge from his past life to change the course of events and save his friends in the Uchiha clan. Another idea might be Naruto exploring Obito's relationship with Rin in a new way, bringing his own sense of loyalty and friendship to the dynamic.
One idea could be that the OC, reborn as Naruto, uses their prior knowledge to quickly master jutsu. For example, they might know about the Rasengan from the start and be able to perfect it faster. Another plot could involve the OC changing the relationships in the village. Maybe they befriend Sasuke earlier and prevent his defection. Or they could introduce new ninja techniques from their past life to the Hidden Leaf.
Another plot could involve an OC reborn into the body of a criminal in the Naruto world. They have to struggle to redeem themselves and prove that they are not the same person as the original criminal. Along the way, they could discover the real reasons behind the original criminal's actions and try to right the wrongs that were committed.
A really interesting plot could be that Tobirama is reborn as a non - ninja, but still has his chakra control abilities. He has to find a way to use his skills secretly while living a normal life at first. As he discovers more about the world he's in, he starts to influence the ninja world from the outside, creating a whole new dynamic in the story.
One interesting plot could be Naruto using his ninja skills in the world of Tsuna. For example, he might use his shadow clone jutsu to help Tsuna deal with multiple threats at once. Another could be Naruto teaching Tsuna some of his unique chakra control techniques which could enhance Tsuna's own combat abilities in his world.
Another plot could be that Nagato is reborn with new powers. With these powers, he aims to unite the different ninja villages in a more peaceful way than before. He could start by building alliances through diplomatic means and by using his powers to solve common problems, like natural disasters or threats from outside the ninja world.
A really interesting plot could be Erika and Kyoya starting a new business together as a married couple. They would face challenges like financial difficulties, competition, and differences in their business approaches, all while trying to keep their marriage strong. This would show their relationship in a different light, not just as a romantic couple but as partners in a more practical sense. There could be scenes of them brainstorming ideas, arguing over decisions, and then making up in a really sweet way. It would add a lot of depth to their relationship and make for an engaging fanfiction.