If Kitsune Naruto was in Highschool DxD fanfiction, it could change the power balance. Naruto is already a very powerful character from his own series. His Kitsune powers, like the nine - tailed fox's chakra, are extremely potent. In Highschool DxD, this could make him a major player. He might not be as interested in the whole devil - angel - fallen angel conflict as the original characters, but his presence would force all the parties to take notice. His unique abilities would also mean that he could teach the other characters new ways of fighting or using their powers, which would have a big impact on the overall story.
Well, one way the storyline could develop is that the Naruto Godlike Kitsune would bring in his ninja skills to the world of Highschool DxD. He could use his transformation abilities like the Kitsune form to deceive enemies or charm the characters in the DxD world. Maybe he'd form an alliance with some of the main characters to fight against common foes, like the devils or fallen angels who might see his power as a threat.
Well, if Naruto had the Rinnegan in the Highschool DxD world, the power dynamics would change drastically. Naruto's abilities with the Rinnegan could make him a dominant force in the battles against the devils and other supernatural beings. He might introduce new jutsu styles that could shock everyone in the DxD universe. Maybe he'd use his Rinnegan to quickly analyze the powers of his opponents and come up with strategies on the fly.
Naruto would be different in this fanfiction in many ways. Firstly, his appearance might change slightly to fit the more modern and different aesthetic of the Highschool DxD world. His clothing could be a mix of his ninja gear and the school uniform of Highschool DxD. His power would also have new applications. For example, his shadow clone jutsu could be used in creative ways in the battles and social situations in Highschool DxD. His character would grow as he learns about the new races and abilities in the Highschool DxD world, and he might start to see his own powers from a different perspective. He'd be more of a bridge between the two worlds, bringing his ninja values and adding them to the mix of the Highschool DxD universe.
A possible blend in the fanfiction could be through a magical or technological device. Maybe a scientist in Highschool DxD creates a device that can open portals to other universes, and Naruto's world is one of the destinations. When Naruto arrives, he discovers that there are elements related to Beelzebub there. The device could malfunction and start to merge the three universes in unexpected ways. This would force the characters to adapt to the new situation, with Naruto using his ninja training to survive, the Highschool DxD characters using their social and magical skills, and those related to Beelzebub using their demonic powers to deal with the chaos.
Naruto would likely be more rebellious. In the original Naruto series, he was an outcast but still had a strong sense of justice. In this crossover, as a delinquent in the Highschool DxD world, he might question the existing power structures more. His sense of humor could also take on a more edgy tone.
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.
He could play the role of a mentor. Since he has godlike powers, he could teach the characters in Highschool DxD new ways of fighting or using their powers more effectively. For instance, he could show the devils how to better use their magic in a more stealthy and efficient way, just like how ninjas use their skills in Naruto.
Well, in such a fanfiction, the story could unfold with Naruto having devilish powers in the Highschool DxD universe. He might use his ninja skills along with new devil abilities. For example, his shadow clone jutsu could be combined with some devilish illusions to outwit his opponents. Maybe he'd form an unlikely alliance with some of the devils in the DxD world, like Issei's group, and they'd go on adventures fighting off other supernatural threats together.
Well, Naruto's immortality could bring a whole new dynamic to the Highschool DxD world. He might use his ninja skills in a really unique way there. Maybe he'd form some unexpected alliances with the characters in DxD. For example, his shadow clone jutsu could be used for various strategic purposes during battles or even for pranks at school.
Well, in a fem Naruto in Highschool DxD fanfiction, it could be really interesting. Maybe fem Naruto would bring her ninja skills to the DxD world. She might befriend Issei and the others. Her chakra could be seen as a unique power in the DxD universe, and she could use her jutsu to fight against the devils and fallen angels. She could also learn about the Rating Games and use her strategic mind from being a ninja to compete in them.