Well, it could be really interesting. The characters in Highschool DxD might get some new and crazy ideas. For example, Issei might be inspired by the ninja skills in Naruto fanfiction and try to incorporate them into his own fighting style. He could start thinking about using stealth and quick strikes like a ninja in his battles against other devils or fallen angels.
A really interesting fanfiction could be where Naruto's Nine - Tails chakra has an unexpected reaction when he is near Moka. Maybe it flares up in a way that he can't control at first, and Moka's vampire instincts sense the power. This could lead to a situation where they have to work together to figure out how to control this new interaction between their powers. Also, Naruto could introduce the concept of ninja teams to the characters in Highschool DxD, which could change the way they approach battles and group activities.
Well, in such a fanfiction, Naruto might feel out of place in the Highschool DxD world. He could be heartbroken because he misses his friends from Konoha. Maybe he has a hard time adjusting to the different rules and powers in the new world.
If Naruto was a god in Highschool DxD fanfiction, he would likely change the power dynamics completely. His abilities could overpower many of the existing characters in the Highschool DxD universe. For instance, his speed and strength, enhanced by his god - like status, would make him a formidable opponent in battles. He might also attract a lot of attention, both from the good and the bad characters in the story, as his power would be a great asset or a threat.
The female characters from Highschool DxD, like Rias, would be intrigued by the unique personalities of the Naruto characters. Rias might see potential in some of them to join her peerage. And the Naruto girls, like Sakura, would be a bit shocked at first by the more revealing outfits and flirty nature of some of the Highschool DxD characters. But over time, they would bond over things like protecting their friends and the school. The Naruto boys would respect the power of the Highschool DxD devils and might even try to incorporate some of their fighting strategies into their own ninja combat styles.
In fanfiction, such a betrayal could occur due to power struggles. Maybe Rias sees Naruto as a threat to her position in the Highschool DxD world. She might fear his growing power and influence, which could overshadow her own. So, in order to maintain her status, she betrays him.
The relationships between the characters might change. If they read about the strong bonds between the characters in Naruto fanfiction, they might strive to improve their own relationships. This could lead to more cooperation among the different factions in Highschool DxD. For example, devils and fallen angels might start to work together more if they are inspired by the teamwork shown in Naruto fanfiction.
Well, in such a fanfiction, Dark Naruto might use his powerful and often shadowy abilities to outwit Rias. Maybe he'd expose some of her less - than - noble actions in the Highschool DxD world. He could easily overpower her in battles, using his ninja skills and the dark powers he has. For example, his shadow clones could be used to confuse Rias and her peerage while he strikes from the shadows.
Perhaps Naruto would try to find allies among the outcasts in the Highschool DxD world. Since he has been betrayed, he would understand the feeling of being alone and might reach out to those who are also on the fringes of society. He could form a new group that challenges the existing power structures in the Highschool DxD universe, using his unique abilities and his unwavering will from the Naruto world.
In fanfiction, anything is possible. Naruto has his powerful jutsu like Rasengan and Shadow Clone Jutsu. If he were in the Highschool DxD universe, he might use his speed and surprise factor. Maybe he could catch Riser off - guard and land a fatal blow with a Rasengan. However, Riser also has his own set of powers in the Highschool DxD world. So it would be a very interesting and intense battle if written well in a fanfiction.
Well, it could be really interesting. The character from Highschool DxD might find the concepts in Naruto fanfiction very strange or inspiring. For example, if Issei from Highschool DxD reads Naruto fanfiction, he might be intrigued by the ninja techniques and different power systems. He could potentially even try to incorporate some of those ideas into his own battles or ways of thinking.