Well, one possibility could be that Naruto, with the power of the Juubi, enters the DxD world. He might use his ninja skills and the Juubi's immense power to face off against the devils and other supernatural beings in the DxD universe. Maybe he forms alliances with some of the characters there, like Issei and his friends, and together they fight a common enemy that threatens both the ninja world and the DxD world.
Naruto and Issei would be really interesting. Naruto, with his positive and determined attitude, would contrast with Issei's more pervy and hot - blooded nature. They could learn a lot from each other. Another interesting interaction could be Naruto and Sirzechs. Sirzechs, as a powerful devil king, would be intrigued by Naruto's power source, the Juubi. And Naruto would be interested in Sirzechs' leadership and power management in the devil world.
One possible fanfiction could involve Naruto with the power of the Juubi in the Highschool DxD world. He might use his newfound abilities to face the devils and fallen angels. For example, his shadow clones could be used in combat strategies against the various factions in the DxD universe.
In this kind of fanfiction, Naruto becoming the Juubi would completely change the Naruto universe. It would mean he has an insane amount of power. He could potentially reshape the world, bring peace in a way no one expected. His relationships with other characters like Sasuke would also be very different. Sasuke might be both in awe and a bit jealous of this new power Naruto has.
Well, in these fanfictions, the world - building is really cool. The Juubi Naruto elements bring a whole new level of combat and power dynamics. In some stories, Naruto might end up making friends with the devils in the Highschool DxD world because of his straightforward and kind nature. His skills and the power of the Juubi can also be a great asset when dealing with the various threats that pop up in the Highschool DxD universe. It's always exciting to see how different authors blend these two universes together.
The combination of different power systems. Naruto's ninjutsu and the Juubi's power are very different from the magic and devil powers in Highschool DxD. So when they're mashed up in fanfiction, it creates unique battles and interactions. For example, how would a devil react to Naruto's shadow clone jutsu? It's a fresh take on both universes.
The plot might revolve around Naruto's Juubi powers disrupting the balance in the Highschool DxD universe. This could lead to him having to either hide his powers or learn to control them in a new way. He might get involved in the Rating Games, using his ninja skills and Juubi - enhanced abilities to compete. And of course, there would be some sort of character development as he adapts to this new world.
In the Highschool DxD fanfiction world, Naruto with the Juubi's power could be seen as a wildcard. His arrival could change the political landscape. For instance, if he sided with a particular devil family, it could shift the balance of power. His ninjutsu skills would be a mystery to the DxD characters at first, and they would have to learn how to work with him. He could also introduce new concepts like the ninja way, which could inspire the DxD characters to reevaluate their own beliefs and fighting styles.
Well, it could be about Juubi Naruto being transferred to the Highschool DxD world. Maybe he'd use his unique ninja skills to stand out among the devils and angels there. And with the harem aspect, he might attract the attention of various female characters from both universes.
Well, he could be a transfer student. Just like any new character in the Highschool DxD world, Naruto could enter the school and immediately draw attention due to his strange powers and different appearance. His Juubi - influenced abilities would make him a target or an ally depending on who discovers him first.