A cool plot could involve Naruto having a unique Sacred Gear that combines his chakra with devil powers. He is initially an outcast in the Highschool DxD world because of this strange combination. But as time goes by, he proves himself in battles against other factions like the fallen angels. Along the way, he forms a deep bond with some of the main characters from Highschool DxD, and together they strive to create a new world order where all species can co - exist peacefully.
Well, a great plot might be about Naruto being a new exchange student in the Highschool DxD school. There, he discovers that some of the devil students are being secretly controlled by a mysterious force. Using his Rasengan and shadow clone jutsu, Naruto tries to expose the culprit and free his new friends. He also has to deal with the complex relationships and power dynamics in the school, which is a whole new experience for him.
One possible plot could be that Naruto is suddenly transferred to the Highschool DxD world. He teams up with Issei and they use Naruto's ninja skills and Issei's Sacred Gear powers to face a new threat that endangers both the ninja world and the devil world. Maybe an ancient evil that was sealed long ago has been awakened and they have to find a way to reseal it.
One possible interesting plot could be the characters from Naruto and Highschool DxD universes being forced to attend a special high school together. Naruto characters like Naruto himself might be intrigued by the unique magic and devil - related things in the Highschool DxD world. And the devils from Highschool DxD could learn a lot about chakra and ninja techniques from the Naruto crew. They could have joint battles against a common enemy that threatens both their worlds, and in the process, form unexpected friendships and rivalries.
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 a fanfiction where Naruto goes to Highschool DxD, he could introduce new concepts of chakra to the world. This would be really fascinating as the characters in DxD might try to incorporate it into their own powers. Naruto could also be a bit of a fish out of water, not fully understanding the social norms and hierarchies in Highschool DxD at first. But his kind heart would help him navigate through it all, and he'd end up changing the school environment in a positive way with his unique personality.
Naruto would be the most interesting. He has such a unique personality and set of skills. His never - give - up attitude would contrast and blend well with the often more self - centered characters in Highschool DxD. He could introduce new values like friendship and loyalty in a more extreme way, and his ninja techniques would be a fresh addition to the battles in the Highschool DxD world.
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.
Well, in a 'Naruto x Greyfia Highschool DxD' fanfiction, perhaps Naruto is a new transfer student in the Highschool DxD. Greyfia could be a popular student there. Naruto's positive and energetic attitude might attract Greyfia's attention. They could start off as friends and gradually develop a deeper relationship. Maybe they get involved in the supernatural battles of the DxD world together, with Naruto using his Rasengan and other jutsu while Greyfia uses her demonic powers. And as they spend more time together, they learn from each other's worlds and values.
One possible plot could be that Naruto is somehow transported to the Highschool DxD universe and meets Gabriel. They might team up to face a common threat that is endangering both the ninja world and the supernatural world of Highschool DxD. Naruto's unique skills as a ninja could be combined with Gabriel's angelic powers in an epic battle against evil forces.
Maybe in this fanfiction, the Nine - Tails in Naruto is actually a super - powerful Sacred Gear that was sealed within Naruto. This Sacred Gear has its own consciousness like in DxD. The story could revolve around Naruto trying to master this new form of power that is a blend of his chakra and the Sacred Gear's abilities. He would have to deal with the various factions in the DxD world who are interested in his power.
Well, a cool plot might involve Issei from Highschool DxD being sent to the Naruto world. He could learn ninjutsu there and then bring some of those skills back to his own world. He might befriend Naruto and they could work together to fight a common enemy that has somehow crossed between the two worlds, like an evil group that wants to take over both the ninja world and the world of devils and angels.
Maybe a story where the main characters from both universes have to team up to fight a common enemy. This enemy could be a powerful demon that has somehow found a way to cross over from another dimension. The Naruto characters could bring their combat skills and teamwork, while the Highschool DxD characters contribute their unique powers related to the devil and angel aspects.