Well, the plot might develop with Sakura being hunted by ninja clans who fear the return of Madara through her. She could then go on a journey to find out more about her reincarnation status. Along the way, she might discover some long - lost jutsu that Madara was known for. She could also form an unlikely alliance with some of Madara's old comrades or enemies in the fanfic. And as she delves deeper into her new identity, she might have to make some tough choices between her old self and this new 'Madara - influenced' self.
In most fanfictions, the evidence is often created within the unique narrative of the story. Maybe it could be things like similar chakra signatures, or shared memories in a dream - like state. However, in the original Naruto canon, there is no such connection, so it's all fictional speculation within the fanfiction.
In many fanfictions, the idea of Sakura being the reincarnation of Madara is used as a plot device. This can lead to some really interesting story developments. For example, it might change how Sakura interacts with other characters like Naruto and Sasuke. Her new 'reincarnation' status could give her access to Madara's powers or knowledge in some way. It also allows the author to play with themes of destiny, power, and self - discovery in a different way compared to the original Naruto story.
There could be implications for the overall plot of the fanfiction. It could lead to a different kind of conflict, perhaps with other characters who have a vendetta against Madara or the Uchiha clan. Sakura's new identity as the reincarnation of Madara could also attract the attention of powerful and dangerous entities, forcing her to face new challenges and make difficult choices that she wouldn't have had to in the original Naruto story.
One challenge is to make their relationship believable. Madara is from a different era and has very different values compared to Sakura. Another is to balance their power levels. Madara is extremely powerful, and Sakura, while strong, is not on the same level. So, it's hard to create scenarios where she can hold her own against him without making it seem unrealistic. Also, staying true to their original characters can be difficult when creating new situations for them in the fanfiction.
Naruto can also be paired with Sakura in these fanfictions. Since they are such close friends in the original, in a reincarnation scenario, their friendship could potentially turn into something more romantic. They could support each other in different ways than in their past lives.
One interesting concept could be Sakura being reincarnated in a different ninja village. This would change her whole upbringing and the way she approaches ninjutsu. For example, she might learn different techniques and have different relationships with her new comrades.
At first, their relationship could be one of teacher - student in a way. Madara, with his vast knowledge of jutsu and the ninja world, could teach Sakura some ancient Uchiha techniques. Sakura, with her thirst for knowledge, would be eager to learn. Through this exchange, they would get to know each other better. As Sakura starts to master these techniques and use them in her own way, Madara might be impressed by her creativity. This could lead to a relationship that evolves from a simple teacher - student dynamic to a more equal partnership, and perhaps even something more romantic over time as they share more personal stories and experiences.
There's a fanfic titled 'Sakura's Reincarnated Path'. In this, Sakura is reincarnated as a princess in a magical realm. It's really interesting as it explores how her ninja skills translate into ruling a kingdom. For example, she uses her chakra control to perform amazing feats that are seen as magic in this new world. It's a unique take on the reincarnation concept for her character.
One idea could be a time - travel plot where Sakura is sent back in time and meets Madara. She tries to change his path of destruction. Another could be a scenario where Madara is resurrected in Sakura's time and they have to team up against a new common enemy. Maybe a plot where Madara, in his search for power, discovers Sakura's unique medical and combat abilities and tries to use her for his own gain.