Well, perhaps Issei replaces Naruto during the Chunin Exams. He would bring his own style of combat, which is very different from Naruto's. Instead of relying on ninjutsu like Naruto does, Issei might use his Sacred Gear more. This could change the whole outcome of the exams. For example, his presence could make some of the villains in that arc, like Orochimaru, more interested in him and his power source, leading to a whole new set of challenges and alliances.
The relationship between Issei and Sasuke would be very different. Sasuke, used to Naruto's determination to bring him back, would now face Issei. Issei might not have the same emotional connection to Sasuke as Naruto did. Instead, he could be more interested in Sasuke's power. With Sakura, Issei's more flirty nature could make her either annoyed or intrigued, quite unlike Naruto's one - sided love for her.
It could be that in the fanfiction, Naruto is under some sort of mind control when he kills Issei. This would add an interesting layer to the story as Naruto would have to deal with the consequences of his actions once he is free from the control.
Well, in such a fanfiction, the plot could be set up in many ways. Perhaps Issei's actions in the crossover world are misinterpreted by Naruto as a threat. Naruto, being a protector of his village and friends, would not hesitate to eliminate a perceived threat. On the other hand, it could also be a dark - themed fanfiction where Naruto is somehow corrupted or forced into killing Issei against his normal moral code.
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.
In some fanfictions, it's possible for Naruto to be Issei's father. Fanfiction often takes creative liberties and can create some really out - there family relationships. However, in the original Naruto and High School DxD (where Issei is from) canons, there's no such connection.
In such a fanfiction, it could be that Issei is bashed because he represents a different kind of hero compared to what Naruto stands for. Naruto is all about self - sacrifice and believing in others no matter what, while Issei is more about his own desires and power - seeking in a way. So when these two worlds collide in the fanfic, Issei might be made to look bad in comparison. Maybe the story has Naruto characters like Sasuke or Kakashi giving Issei a hard time because they don't approve of his behavior.
Yes, there might be such fanfictions out there. The idea of crossing over two very different anime universes like Naruto and High School DxD (where Issei is from) and creating a family - like bond between the characters is an interesting concept that fanfiction writers might explore.