One possible plotline could be Naruto being transported to the Highschool DxD world and having to adapt to its unique rules and social hierarchy. He might use his ninja skills to rise through the ranks in the school. Another could be that Naruto's presence disrupts the existing power balance in the DxD world, leading to various conflicts and alliances. Maybe the devils and angels in the DxD world are intrigued by Naruto's power and try to either recruit him or eliminate him.
The devils who oppose Naruto's presence and his new - found influence in the DxD world could be main antagonists. They might see him as a threat to their power structure and the way things are done in their society.
Well, you can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just type in 'Naruto replaced Highschool DxD' in their search bars, and you should be able to find some relevant works. However, the availability might vary depending on the popularity of this particular crossover concept.
One idea could be that Naruto finds himself in the DxD world and tries to use his ninja skills in the battles against devils and fallen angels. Maybe he forms unique alliances with the various factions in the DxD world, like teaming up with Rias Gremory's peerage and teaching them some ninja techniques.
It could mean that in some context, the original Naruto work has taken the place of fan - created fiction about Naruto. Maybe official Naruto content has become so comprehensive or dominant that fanfiction seems less relevant.
It can be seen as a good thing. The official Naruto content is likely to be of high quality and consistent with the overall vision of the creator. So if it replaces fanfiction, fans get a more 'authentic' Naruto experience.
Yes, it can be. Naruto is a very popular series, and with its large fan base, there are bound to be a lot of fanfictions. Some fans may lack the creativity to come up with original ideas, so duplicate fanfictions are likely to emerge, making it seem like Naruto is being replaced in some areas of the fandom.
Well, 'naruto replaced by duplicate fanfiction' might imply that there's an excessive amount of fan - created stories that are just copies or very similar to existing Naruto concepts. This could be due to the popularity of Naruto. Some fans might not be creative enough and end up creating duplicate fanfictions, and as a result, it seems like Naruto is being replaced in a sense. For example, in some online fanfiction platforms, you might see a flood of stories that follow the same plotlines as Naruto, making it hard to distinguish the original charm of Naruto from these duplicates.
There probably is. A lot of fanfiction platforms are filled with creative crossovers. Given the popularity of Naruto and High School DxD, some fans might be intrigued by the idea of Naruto being in the Dragon DxD universe. They could explore how Naruto's abilities would interact with the unique magic and supernatural elements in the Dragon DxD world, like how his ninja skills would fare against the devils and angels in that setting.
One idea could be that Naruto is somehow transported to the world of Highschool DxD. He could use his ninja skills and chakra in the new world, maybe even teach some of the characters there a thing or two about combat. For example, he could show Issei how to better control his power using chakra control techniques.