One possible plot could be that Rikudou Sennin somehow gets transported to the world of Highschool DxD. Maybe his powers disrupt the balance there. For example, his chakra could be mistaken for some kind of new and strange power in the DxD world. The characters in DxD might initially be wary of him but then start to see the potential of his abilities and try to recruit him for their own purposes.
Well, perhaps in this fanfiction, Rikudou Sennin is a hidden figure in the Highschool DxD world. He could be influencing events from the shadows, like guiding Issei in a very different way compared to the normal storyline. He might use his knowledge of ninjutsu and the power of the Six Paths to help Issei gain new powers or face stronger enemies. His presence could also introduce a new element of mystery to the DxD world as the characters try to figure out who he really is and where he came from.
In this fanfiction, it could be that Rikudou Sennin is reborn as a student in the Highschool DxD world. He retains his past life memories and powers. As a student, he has to navigate the complex social and power dynamics of the school. He might use his powers to protect the school from threats that are beyond the normal scope of the DxD world. He could also start to train some of the DxD characters in the ways of ninjutsu, creating a whole new group of fighters who combine the powers of the DxD universe with ninja techniques.
Yes, there are some interesting ones. You can check out fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'rikudou naruto highschool dxd' and you'll likely find a variety of stories with different takes on combining the elements of Naruto and High School DxD.
One interesting plot could be that Rikudou Sennin is reborn into a time when the ninja world is on the verge of a new, unknown threat. He has to quickly regain his powers and knowledge to guide the new generation of ninjas, like Naruto and his friends, to face this threat. Maybe he has lost some of his memories in the rebirth process, adding an element of mystery and self - discovery to the story.
Rikudou Sennin's chakra could be seen as a unique power source by the DxD characters. For example, devils might try to make pacts with him to gain access to his chakra. His ability to manipulate the Six Paths powers could also give him an edge in battles against the various beings in the DxD world. He could potentially use his power to nullify some of the abilities of the angels or fallen angels.
Yes, in some fanfictions, Naruto can be depicted as the Rikudou Sennin. Fanfiction writers often take creative liberties and come up with unique storylines where Naruto might inherit the powers or even be reincarnated as the Rikudou Sennin to explore different plot developments and character arcs.
One possibility is that Naruto has a spiritual journey with Rikudou Sennin. They could travel through different time periods related to the history of the ninja world. Naruto would see first - hand how the world came to be the way it is. And through this journey, Naruto's understanding of his own purpose and the ninja way could be deepened. Rikudou Sennin might also reveal some hidden prophecies or destinies that Naruto has to fulfill.
One implication is that Naruto would have an extraordinary amount of power. He could potentially reshape the ninja world more easily. For instance, he might be able to end all wars and conflicts with a snap of his fingers.
One common theme is power - how the powerful abilities from Naruto, especially those related to Rikudou, mesh with the devil - based powers in High School DxD. Another could be relationships, like friendships or rivalries between characters from the two series.
His powers could be integrated in a really cool way. For example, the Rikudou Sennin's ability to control all the chakra natures might translate into some sort of unique magic control in the DxD universe. Maybe he could use his Sage Mode to enhance his perception of the supernatural elements in DxD. Since he has the power of the Ten - Tails, it could be something like a super - powerful familiar or a source of immense energy that he could draw from in battles against devils, angels, and fallen angels.
In fanfiction, the idea of Naruto being the son of Rikudou Sennin can be really interesting. It could change so many aspects of the story. For example, his relationship with other characters like Sasuke might be different. His power growth could also be explained in a whole new way. But we have to remember that this is just a fan - created concept and not part of the original Naruto story. The original story has its own well - established plot and character relationships that are different from this fanfiction idea.
One interesting plot idea could be that the reborn Rikudou Sennin has partial amnesia. He remembers his great power but not how to fully control it. This leads to him accidentally causing chaos in the ninja world as he tries to relearn his abilities. Another idea is that he is reborn into a different clan than his original one, and has to deal with the cultural and political differences while still having his old soul's knowledge.