There could be a storyline where Naruto is summoned to the High School DxD world by some ancient magic. He is seen as a powerful ally or a threat depending on who you ask. Rias takes it upon herself to figure out Naruto's intentions. As she gets to know him, she realizes that his values of friendship and protecting the weak are similar to her own. Together, they start a journey to stop a dark force that is rising in the DxD world, with Naruto teaching the devils some ninja techniques along the way.
Perhaps a story where a group of rogue ninjas from Naruto's world team up with some evil devils in the High School DxD world. Naruto and Rias both sense the danger this alliance poses. They form an unlikely alliance of their own. Along the way, they face many challenges. Naruto has to learn about the different races in the DxD world like fallen angels and dragons, and Rias has to understand Naruto's ninja way. In the end, they not only defeat the bad guys but also bring about a new understanding between their two worlds.
Another possibility is that there is a tournament that spans multiple universes. Naruto is selected to represent his world, and Rias volunteers or is chosen to represent the High School DxD world. They meet at the tournament grounds. At first, they might be a bit suspicious of each other, but as they see each other's skills and determination in the battles, they start to respect and eventually become friends, working together to win the tournament for their respective worlds.
A great plot could be a tournament - style story in the 'Naruto x Rias High School DxD' fanfiction. The tournament could be a mix of ninja and devil skills. Naruto enters representing his ninja heritage and Rias enters on behalf of the devils. Along the way, they have to face opponents from different factions. As they progress, they start to understand each other better and develop a deeper bond. Naruto's determination to win for the sake of his new friends in the DxD world and Rias's desire to prove the strength of the devils would drive the story forward, and their combined efforts could lead to an unexpected victory.
One possible idea for this fanfiction could be Naruto being transported to the world of High School DxD. He might end up attending the same school as Rias. Given Naruto's strong sense of justice and his combat skills, he could quickly become involved in the supernatural battles and power struggles in that world. He might also form an interesting relationship with Rias, perhaps starting as friends and gradually developing into something more as they face various challenges together.
Naruto might teach some of his ninja skills to the students in the High School DxD. For example, his tree - climbing and water - walking techniques could be really interesting for them to learn. Rias could be intrigued by Naruto's determination and his never - give - up attitude. She might see him as a valuable addition to her peerage. And in return, Naruto could be fascinated by Rias's devil powers and the way she manages her group. They could also have some cultural clashes, like Naruto's more simple and straightforward ninja culture compared to the complex and often flamboyant devil culture in High School DxD.
The plot could also be centered on a mystery related to their family. The brother of Rias discovers some secrets about their family's past that put them both in danger. He then has to work with Rias to uncover the truth and stop whoever is trying to use their family secrets against them. This could involve battles, political intrigue within the Devil world, and self - discovery for both of them.
Well, if Naruto were Rias' twin brother, it would completely change both storylines. In Naruto's world, his new family connection to the Gremory family in High School DxD might introduce devilish powers and politics into the Hidden Leaf Village. This could lead to new alliances and rivalries. For example, the Akatsuki might view Naruto differently, seeing him as a potential link to a powerful devil family. In High School DxD, the devils might be more involved in the affairs of the ninja world, perhaps trying to gain access to unique ninja techniques. It would also change Naruto's and Rias' characters. Naruto might grow up with a different sense of self, having a devil heritage, and Rias would have a strong connection to the ninja world through her brother.
Well, in this fanfic scenario, Naruto's ninja skills could be a huge asset in the High School DxD world. He might introduce new combat styles and strategies. For example, his shadow clone jutsu could be used in various battles or for pranks. Also, his strong sense of justice would likely influence Rias and her peerage. He could help them make more morally upright decisions, and his experience with facing powerful enemies in the Naruto universe would give them new perspectives on handling threats in their own world.
He would still likely have his chakra - based powers from the Naruto universe. So he could use techniques like the Rasengan or Shadow Clone Jutsu. However, due to his emotionless state, he might use them in a more precise and less flashy way. His Nine - Tails chakra could also be present, but perhaps he would have better control over it since emotions often cloud his control in the original series.
Evil Naruto would still have his basic ninja powers. He'd have his shadow clones which could be used for various purposes, like spying or overwhelming opponents in battle. His Rasengan would also be a very powerful attack. Additionally, he could have some dark - themed powers due to his evil nature. Maybe he could corrupt his chakra to have a more sinister effect on his enemies, like causing them to feel despair or weakening their will.
One possible reason for such a fanfiction could be to explore a different dynamic in the story. Maybe the author wants to show a more complex relationship where Issei has some deep - seated issues with Rias' leadership style or her decisions. It could also be a way to create conflict and drama, which are essential elements in fan - created stories.