Percy would most likely find it both fascinating and a bit bewildering. The concept of ninjas and their unique abilities would be a whole new thing for him. He might start to think about how the Naruto characters would fare in his world and vice versa. He could also be interested in the character development of Naruto and Sasuke. Since he values friendship so much, he might be drawn to how Naruto's friendship with his comrades affects the story, just like how his friendships with Annabeth and Grover are important in his own adventures.
He'd probably be very intrigued. Percy has a penchant for adventure and new things, and this fanfiction would be something completely different from what he's used to.
Well, it would be really strange. Percy Jackson comes from a world of Greek mythology, and Naruto vs Sasuke fanfiction is from the Naruto universe. Percy might be really confused at first. He'd probably wonder about all the ninja stuff, like jutsus and the shinobi clans. But he's also a curious guy, so he might get into it and start comparing the power dynamics in the Naruto story to the battles he's used to in his own world.
Percy's reaction would be a mix of confusion and fascination. The world of Kratos is so foreign to him, with different rules and a much darker tone. However, he would also be drawn to the hero's journey that Kratos undertakes in the fanfiction, comparing it to his own journey as a demigod.
Ruby would be excited. She loves stories full of action and adventure, and Percy Jackson fanfiction would be right up her alley. Weiss might be a bit more reserved, but could still find aspects of it to enjoy, like the complex characters. Blake would be interested in the themes of the story, such as loyalty and friendship. Yang would be enthusiastic, especially about the fight scenes and the strong characters in the fanfiction.
Bruce Banner, when he's not in Hulk mode, would be really interested in the scientific aspects that might be hidden in the Percy Jackson fanfiction. Even though it's a world of magic, he could look for ways that the magic could be related to some kind of scientific principle. He might also be interested in how the characters control their powers, whether it's Percy with his water powers or the Avengers with their various abilities, and look for similarities in self - control and management of power.
I think young Sasuke would have a very intense reaction. He was so consumed by his hatred for Itachi at that young age. A Sasuke vs Itachi fanfiction would be like a trigger for him. He would be eager to see how the fictional fight is portrayed. If Sasuke in the fanfiction is shown as strong, it might fuel his own ego and make him strive even harder to become powerful. However, if the fanfiction shows Itachi as superior, it could enrage him. He might feel that it undermines his own goal of defeating Itachi and he might even want to find the writer to correct their 'wrong' view.
He might be intrigued. After all, it's about a world he's somewhat connected to.
Percy could be a bit skeptical at first. He's been through a lot in his own world, and fanfiction might seem a bit strange to him. But as he reads more, he could get really into it. He might find himself rooting for the characters in the Red Pyramid fanfiction, especially if they remind him of his friends or himself in some way. For example, if there's a character who is an underdog but has great potential, just like Percy felt in his early days.
Athena, being the goddess of wisdom, might analyze the fanfiction. She could look at how the mortal writers understand the Greek mythology and use it to create new stories. She might be impressed by the intelligence and creativity of some of the fanfictions, or she might be critical of inaccuracies.
The gods in the Percy Jackson universe would have mixed reactions. Some might see the daughter as a potential threat or a powerful ally. Zeus might be initially suspicious, but if the daughter proves her worth, he could be an important figure in her story. Poseidon would be proud, as he was of Percy. In the Naruto world, the village elders would be cautious. They would want to make sure the daughter uses her powers for the good of the village. But characters like Iruka would be very supportive from the start, seeing the potential for great things in the daughter.
The cultural clash between the ninja world of Naruto and Sasuke and the world of Percy Jackson would also be a big part of it. Naruto and Sasuke are used to a very different set of rules and values. In the Percy Jackson world, they would have to adapt to things like the importance of the gods and the role of demigods. This adaptation process could create a lot of drama and growth for their characters. For instance, Naruto might struggle with the idea that the gods seem so much more involved in the lives of mortals compared to his own world, while Sasuke might be intrigued by the power dynamics among the demigods.