One common theme is redemption. Since they have a new chance at life through reincarnation, often Sasuke gets a chance to atone for his past mistakes. For example, in some fanfics, he uses his new life to make up for the pain he caused in his previous life.
One popular 'Naruto and Sasuke reincarnation fanfiction' is 'Reincarnation of the Uchiha Brothers'. It has an interesting plot where Naruto and Sasuke are reincarnated in a different era and have to deal with new threats while still having a strong bond from their past lives.
One possible plot could be that Harry, after his death in the Harry Potter universe, is reincarnated as Sasuke in the Naruto world. He would then have to deal with Sasuke's past traumas and his own new set of ninja skills and challenges. He might use his knowledge from the wizarding world in unexpected ways in the ninja world, like using magic - like spells that are disguised as ninja jutsu.
In the 'naruto is protected by sasuke fanfiction', Sasuke's protection of Naruto could be multi - faceted. Sasuke, being a powerful ninja, would first of all use his physical strength and speed to block attacks aimed at Naruto. Emotionally, his bond with Naruto would make him extremely vigilant. He might sense Naruto's distress from afar and rush to his aid. In terms of strategy, Sasuke would likely plan their movements carefully when they are in dangerous situations, ensuring Naruto is always in a relatively safe position. His ability to quickly analyze a battle situation and react accordingly would be crucial in protecting Naruto.
Sasuke's adaptation would be a long process. He'd start by observing the daily lives of wizards. He'd notice how they use magic for simple tasks like lighting candles or cleaning. In contrast, in his past life, he'd use ninjutsu for such things. He'd have to get used to the fact that he can't just rely on his Sharingan all the time. He might attend classes at Hogwarts and learn about different spells. At the same time, he'd be constantly comparing the magic here to his ninja skills. As time goes on, he'd start to blend in more, using magic in his own unique way that combines his ninja - like thinking.
In fanfiction, anything is possible. So, Naruto could be Tobirama's reincarnation. Some fanfic authors like to play with the idea of reincarnation to bring new elements to the story. They might make Naruto inherit some of Tobirama's chakra nature or jutsu. This can create unique scenarios where Naruto has to deal with the memories or expectations that come with being Tobirama's reincarnation. It can also change the dynamics between Naruto and other characters, like Sasuke, as they might view Naruto differently if he has such a connection to an important figure from the past.
Yes, there are such fanfictions in the Naruto fanfiction community. Some fans like to explore unique and creative scenarios in their writing, including this rather unexpected one.
Yes, in many Naruto fanfictions, Naruto is depicted as the reincarnation of Hagoromo. This concept adds an interesting layer to his character and often ties into more elaborate plotlines that explore his connection to the Sage of Six Paths on a deeper level.
Well, in some fanfictions, Naruto might be promoted over Sasuke because Naruto has always been seen as the more positive and inspiring character. He has a strong will to protect his friends and the village, and his growth throughout the series is more in line with the traditional hero's journey. His ability to make friends and bring people together could be a reason for his promotion in the fanfiction.
It might be for Naruto's own good. Sasuke may believe that Naruto is on a dangerous path that will lead to his downfall. So he captures him to keep him from making bad decisions, like sacrificing himself for the village or something similar. He wants to save Naruto from himself in a sense.