It would mean a really interesting mash - up of two different fictional worlds. Issei might gain unique abilities and a different perspective on combat and self - improvement.
I'm not sure if there's a specific instance where 'issei' is actually trained by Naruto fanfiction in a literal sense. There could be some fan - created crossovers or concepts where someone might play around with the idea, but it's not a common or established form of training in the official Naruto or Issei - related canons.
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.
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.
Well, Naruto would probably gain some really unique magical abilities. Fairy Tail mages are known for their diverse magic, and Naruto could combine his chakra skills with something like Fire Magic or Celestial Magic. He might become even more powerful in combat, with new ways to attack and defend.
Naruto would gain better combat awareness. Kurama's experience in battles can be passed on to Naruto. He'll be able to read his opponents better, know when to attack and when to defend. This will make him a more formidable opponent in combat situations.
Yes, there are likely to be such fanfictions out there. The idea of Naruto being trained by Ichigo combines two very popular anime characters from different series. Fanfiction writers often come up with creative crossovers like this. You can try searching on major fanfiction platforms to find specific works.
One possibility in this fanfiction could be that Naruto gains new and unique combat skills. Monkey D. Dragon is known for his revolutionary ideas and powerful abilities in the 'One Piece' world. Under his training, Naruto might learn different ways of strategizing and approaching battles, perhaps incorporating some of the more unorthodox fighting styles from the 'One Piece' universe. This could lead to Naruto becoming even more formidable, not just in terms of his ninjutsu, but also in his ability to lead and inspire others in a different way, much like how Dragon has an impact on the 'One Piece' world.