One idea could be that Naruto is somehow transported to the world of High School DxD and meets Moka. He could use his ninja skills in the battles that take place in the DxD world. Maybe he teams up with Moka to fight off common enemies.
One idea could be a crossover where Naruto is somehow transported to the world of High School DxD. He meets Gabriel, and they team up to face a common threat. Maybe a powerful devil or a new, unknown enemy. Naruto's ninja skills could be a great asset in the battles of the DxD world.
Another idea is that Naruto is reborn in the High School DxD world as a half - dragon due to the influence of the Dragon God. He then has to navigate the complex social and power structures of the DxD world while also hiding his true identity at first. As he discovers more about his new powers and the world around him, he gradually becomes a key figure in the battles and politics of the DxD world.
A Naruto - High School DxD fanfiction with the concept of immortality could start with Naruto being summoned to the DxD world by an unknown force. Since he's immortal, he doesn't fear death like many in the DxD world do. This could lead to him taking on more dangerous quests or getting involved in the wars between the different species. He could also use his immortality to experiment with different powers and techniques in the DxD world without the risk of dying, which would make him a very formidable and unpredictable character.
Yes, there are likely fanfictions that combine the two universes in a non - sexual way. Many fans enjoy creating crossovers that focus on adventure, friendship, or the characters facing new challenges together. For example, they might write about Naruto characters ending up in the High School DxD world and having to adapt to its unique rules and magic systems while still maintaining their own ninja skills and values.
One idea could be a crossover where the characters from Katekyo Hitman Reborn end up in the world of High School DxD. For example, Tsuna and his friends could be transferred to the school in High School DxD and have to deal with the devils and angels there. They might use their unique abilities from Katekyo Hitman Reborn to survive and adapt in this new and dangerous environment.
Well, a fanfiction like this could be really interesting. One way it could work is by having a character from Naruto world somehow end up in the High School DxD universe and interact with the archangels there. Maybe Naruto himself could gain some new powers related to the angelic realm in this crossover. He could learn about different hierarchies of angels which are very different from the ninja system he's used to.
A more complex fanfiction could be about a joint mission between the two universes. The leaders of both worlds realize that there is a common threat that only the combined forces of Highschool DxD and Naruto can defeat. So, they send their best characters, like Rias and Sasuke, to work together. This would involve a lot of character development as they learn about each other's cultures and powers.
One idea could be a crossover where Naruto characters are transported to the world of The Highschool of DxD. For example, Naruto himself could end up at the high school and his ninja skills would be quite a shock to the devils and other beings there. He might get involved in the Rating Games, using his shadow clones and other jutsu to his advantage.
In this fanfiction, Naruto could be on a mission to find a way back to his own world. Along the way, he teams up with Issei and his group. Together, they face various challenges, including battles against powerful devils. Naruto's sage mode could be a crucial factor in these battles, and he might also learn some new skills from the DxD world.
One idea could be Naruto being summoned into the High School DxD world during a battle. His unique ninja skills would shock the devils and angels in that universe. He might form an unlikely alliance with Issei, perhaps teaching him some ninja techniques in return for learning about the Sacred Gears.