I think Naruto and Issei would be a very fun combination. Issei is all about his pervy ways and his growth as a devil. Naruto, on the other hand, is a pure - hearted ninja. Their interactions would be hilarious at times and also very educational. Issei could learn about real strength and honor from Naruto, and Naruto could get a taste of the crazy world of Highschool DxD through Issei.
Naruto and Akeno could also be an interesting pair. Akeno has her own mysterious side and her powers. Naruto's positive energy and his ability to befriend almost anyone could draw out a different side of Akeno. They could go on adventures together in the school, with Naruto using his ninja skills and Akeno using her lightning - based powers to fight off any threats that come their way.
Naruto and Rias would be an interesting combination. Naruto's straightforward and determined nature combined with Rias's leadership and her own goals in the world of Highschool DxD could lead to some really engaging storylines. They could learn from each other, like Naruto could teach Rias about his ninja way of never giving up, and Rias could introduce Naruto to the complex politics of the devils.
Naruto and Rias would be really interesting. Naruto's straightforward and determined personality combined with Rias' leadership and strategic mind could lead to some great interactions. They could learn from each other's fighting styles and ways of dealing with problems in their respective worlds.
The interactions between Naruto and Akeno would be quite fascinating. Akeno has her own allure and power. Naruto, being godlike, would be an enigma to her. She might be intrigued by his powers and his different way of looking at things. They could have some deep conversations about power, morality, and the differences between their two worlds while also having some light - hearted moments due to Naruto's sometimes clueless nature about the more flirty aspects of Akeno's personality.
Definitely Naruto and Issei. Issei is all about his perverted ways and getting stronger, while Naruto is focused on protecting his friends and achieving his dreams. Their clash of personalities would be really interesting. Naruto might not understand Issei's obsession with girls at first and try to set him straight. And Issei would be amazed by Naruto's power and want to learn from him.
One possible plot could be Naruto being somehow transported to the world of Highschool DxD. He could use his ninja skills and chakra in the battles against the devils and fallen angels in that world. Maybe he teams up with Issei and his group, and Naruto's unique jutsus like Rasengan and Shadow Clone Jutsu surprise everyone.
One possible fanfiction could involve a crossover where the characters from Highschool DxD and Naruto meet in a unique world. Yasaka, being a powerful figure in the Highschool DxD universe, might interact with Naruto characters. For example, she could form an alliance with Naruto to fight against a common enemy that somehow threatens both of their worlds. Maybe a group of rogue ninjas from Naruto's world team up with some rogue devils from Highschool DxD.
Issei is often very popular. His growth as a character from an ordinary boy to a powerful figure makes him a central focus in many fanfictions. His relationships, especially his romantic interests, also add to his popularity.
Ruby and Issei would be an interesting pairing. Ruby's innocent yet determined nature combined with Issei's perverted but also heroic side could lead to some really fun and dynamic interactions. They could learn a lot from each other in terms of combat and dealing with different types of threats.
The interaction between Illya and Rias would be really interesting. Rias is a powerful devil with a lot of charm and leadership. Illya, on the other hand, is a magical girl with her own set of powers. They could start off as rivals, both vying for the attention or respect of other characters, but then realize they have more in common and can work together.
I think Naruto himself would be the most interesting. His positive attitude and never - give - up spirit would be really unique in the Highschool DxD world which has a lot of complex power struggles and some rather morally grey areas. He could bring a fresh perspective and also his powerful ninja techniques would make him a force to be reckoned with in battles against devils and angels.
I think Naruto would be the most interesting. His energetic and determined personality would stand out in the Highschool DxD world. He could bring his ninja way of life and values, which are quite different from the devilish and angelic cultures in DxD. His ability to make friends easily might also lead to some really unique interactions with the DxD characters.