Another interesting aspect could be the OC's struggle with adapting to Sasuke's personality and the expectations placed on him. They have to balance between being true to their own self and fulfilling the role of Sasuke. This internal conflict could create a lot of drama and character development, especially when dealing with characters like Itachi and the Uchiha clan's legacy.
Maybe the OC reborn as Sasuke has some special powers from their previous life that they combine with Sasuke's natural abilities. This could lead to new and exciting jutsu creations. They could also use their knowledge of future events to help Sasuke form better relationships with his teammates, like Naruto and Sakura, which would in turn affect the overall story arc of Naruto.
Also, the oc might have different goals than Issei. While Issei is often focused on his perverted desires as well as becoming stronger to protect his friends, the oc could have a more noble or self - centered goal like finding a way back to their original world or using the power in this new world for personal gain in a non - perverted way. This contrast in motives can create a lot of tension and interesting plot developments.
A really interesting plot would be Naruto, reborn as Sasuke, trying to prevent the events that led to Sasuke's departure from Konoha in the first place. He would use his knowledge of the future and his Naruto - esque determination. He might also struggle with Sasuke's memories and emotions, which could create internal conflict. For example, when dealing with Orochimaru, he would have to fight the urge to follow Sasuke's original path while also trying to outwit Orochimaru with his own Naruto - like wits.
One idea could be that the reborn OC genius uses their extraordinary intelligence to solve a mystery that has baffled the entire community. For example, they might figure out the secrets behind an ancient artifact's power.
One idea could be that the OC, now as Kakashi, has to deal with the same traumas Kakashi had but with a different perspective from their original self. For example, they might handle the loss of their comrades in a new way that changes the course of events in the Naruto world.
One idea could be an OC who has a unique power to communicate with Titans on a deeper level. This power could be a double - edged sword, as it might draw unwanted attention from both humans and Titans. Another plot could revolve around an OC who is a master of stealth and uses it to uncover secrets within the Walls. For example, they could discover hidden chambers or forgotten knowledge about the Titans.
One plot idea could be the OC struggling with the idea of being a mother at a young age while Sasuke is away on a mission. She has to deal with the judgment of the village and her own insecurities. Another could be Sasuke's reaction when he finds out. He might be initially shocked but then become very protective.
One plot idea could be that the OC is a powerful ninja from a hidden village. She meets Sasuke first during a mission where they initially clash due to Sasuke's brooding nature and her more optimistic outlook. Later, she also encounters Gaara. Gaara is intrigued by her because she doesn't fear him like others. The OC then finds herself in a love triangle, with Sasuke being drawn to her because she challenges him, and Gaara seeing in her a chance for a different kind of connection. As the story progresses, she has to choose between them while also dealing with the political unrest in the ninja world that affects all three of them.
An interesting approach for a 'Naruto Reborn OC Fanfic' would be to create an OC who is an outsider to the ninja world but has to adapt quickly. This OC could be from a far - off land where they have different fighting styles or powers. For instance, a place where they use music as a form of combat, and when they come to the Naruto world, they have to blend in while also introducing their unique skills. They could form unexpected alliances and face challenges that are different from what the native ninja are used to.
She could be a healer in the fanfiction. In the world of Naruto, healers are very important. Sasuke's sister OC could use her healing skills to help not only her friends but also enemies in need. This would create a lot of interesting situations where she has to make moral choices. For instance, should she heal a ninja from an enemy village who has information that could save her village? It would also put her in a unique position within the Uchiha clan as a valuable asset.
A possible plot is that the reborn female OC starts to form a different kind of relationship with the existing characters. Since she's female, her friendship with Annabeth could be more of a sisterly bond where they support each other in different ways compared to Percy and Annabeth's relationship. And she might have a romantic sub - plot with a new character, someone who was not really in the spotlight in the original series. This new relationship could be shaped by her unique identity as a reborn character.