He could also rely on his own skills and past achievements. Naruto has saved the village multiple times. By bringing up these instances, he can show that he has always been on the side of good and that it doesn't make sense for him to be framed for something he didn't do. He might also use his ninja skills to investigate and find the real culprits, which would prove his innocence.
It could also be a power play. In the Naruto universe, power is a big deal. Some might frame Naruto to get him out of the way in their pursuit of power. Since Sasuke has his own group of fans in the fic, they could be used as tools to achieve this by making it seem like Sasuke is against Naruto, when in fact it's all a setup.
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.
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.
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.
In some fanfictions, Naruto might reject Sasuke because of Sasuke's continuous pursuit of power in a way that endangers others. Naruto, who values friendship and the safety of the village, could see this as a betrayal of their shared values.
Naruto might protect Sasuke by using his physical strength. He's got those powerful jutsus like the Rasengan. If any enemy comes near Sasuke, Naruto can just blast them away with his attacks.
Sasuke could be a likely character in some fanfiction. Maybe in an alternate universe where their rivalry takes a darker turn, Sasuke might frame Naruto to gain an advantage or to prove his own superiority. It would add a whole new dimension to their relationship.
I don't think it's a common type. The typical Naruto fanfictions usually revolve around things like the ninja battles, the growth of the characters, or the complex relationships in a more traditional sense. The concept of one character being the 'property' of another is a bit extreme and not in line with the general feel of the Naruto series. So, it's not likely to be a very common form of fanfiction.