Rias would probably be very interested in Naruto's Hiraishin. She might see it as a powerful tool for her peerage. Issei, on the other hand, would be both amazed and a bit envious. He might try to challenge Naruto to a friendly spar to see how it works. And Akeno would likely be intrigued by Naruto himself, with the added allure of his unique jutsu.
There would be a lot of interesting interactions. For instance, Kiba from High School DxD might be interested in how Naruto uses his Hiraishin in combat, considering Kiba has his own skills related to speed and movement. Xenovia could be skeptical at first but then see the potential of using it in battles against devils and fallen angels. The devils in general would be cautious around Naruto, as his Hiraishin gives him an unpredictable element in fights.
Well, let's consider Kiba from High School DxD. He's a proud devil with his own set of skills. If Naruto Juubi was in the fanfiction, Kiba might be a bit jealous of its power at first. He might try to prove himself by competing with Naruto Juubi in some way. Xenovia, with her strong sense of justice, could have an interesting relationship. She might see Naruto Juubi as an unknown entity and be on guard, but also be curious to see if it has good intentions. Naruto Juubi, coming from the Naruto universe, might be confused by the different social norms in High School DxD. This could lead to some comical interactions with characters like Asia, who is very kind - she might try to befriend Naruto Juubi and explain the ways of their world.
Well, if Naruto's Hiraishin was introduced into the High School DxD universe, it would likely create a huge shift. Characters in DxD would be astounded by the sudden appearance of this teleportation jutsu. It could change battle dynamics completely. For example, in a fight against a powerful devil, Naruto could use Hiraishin to quickly close the gap and land a surprise attack. It might also lead to new alliances as characters try to understand and utilize this new power.
Naruto and Ravel might start off as strangers. Naruto would be the curious outsider, and Ravel would be intrigued by his different appearance and powers. Then, Naruto could interact with other DxD characters. For example, he might have some friendly competitions with Issei. As the harem forms, Naruto would have to balance his relationships with different girls. He might have deep conversations with Ravel about their different worlds and values.
A crossover might involve power - up scenarios. The Hound from the fanfiction could potentially gain some of Naruto's chakra or learn his techniques. In the High School DxD universe, this new power could disrupt the existing power balance. Also, the story could focus on the relationships between the characters. Naruto is known for his strong bonds with his friends, and this could be contrasted or integrated with the relationships in High School DxD, like the complex relationships between the devils, angels, and fallen angels.
Goku could have some interesting interactions. He might befriend Issei for his determination. Goku, being a pure - hearted fighter, would probably respect Issei's will to get stronger. He could also have friendly rivalries with some of the stronger devils or angels, challenging them to friendly spars to test their strength.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.
One plot idea could be that a kitsune from the Naruto universe gets lost and ends up in the High School DxD world. She has to find a way back while also dealing with the various devils and angels in the DxD world. Another could be that a powerful kitsune is reincarnated as a student in the DxD high school and has to hide her true identity while using her Naruto - inspired powers to deal with the school's problems.
Gohan and Issei would be really interesting. Issei is all about being a pervert and getting stronger in his own way. Gohan is this powerful yet humble Saiyan. Their different outlooks on power and relationships would create a lot of humorous and thought - provoking moments.
The Doom Slayer and Vali would make for an exciting interaction. Vali is a very powerful and ambitious character in High School DxD. He would likely see the Doom Slayer as a rival or a potential ally in his quest for power. The two of them could engage in some epic battles or team up against a common enemy. Additionally, the interaction between the Doom Slayer and Koneko would be interesting. Koneko is a quiet and strong - willed character, and she might be curious about the Slayer's motives and his unwavering dedication to his mission.
Naruto might be really curious about Rukia's powers. He would constantly ask her questions and be in awe of her ability to manipulate souls. Rukia, on the other hand, could be intrigued by Naruto's never - give - up attitude. She might see a bit of Ichigo in him in terms of his tenacity.