Perhaps Naruto gets caught in the middle of the war between the three factions in DxD (angels, devils, and fallen angels). His ninja skills would give him an edge in combat, but he would also have to learn about the different power systems in this new world. For instance, he might be able to use his chakra to resist some of the magic attacks from the fallen angels. And his sense of justice would likely lead him to side with the group that he believes is in the right.
A really interesting plot could be that Naruto has a special connection with a fallen angel. Maybe the fallen angel has a power similar to Naruto's, like a special energy that can be molded in different ways. They could form an unlikely alliance and together discover secrets about both of their worlds. This could lead to a whole new arc in the fanfic where they try to use their combined powers to bring peace or fight a greater evil.
He could be a new type of threat or ally in the DxD world. Since Naruto has such powerful abilities, the fallen angels might see him as a potential weapon or a hindrance to their plans.
In this fanfic, Naruto's unique abilities like his shadow clones and Rasengan could be combined with the magic and powers in the DxD universe. For example, a fallen angel might be interested in Naruto's chakra and try to use it for their own purposes. Naruto, being the hero he is, would not let that happen and would start a conflict that could lead to an epic adventure.
One idea could be to create a fanfic where Naruto is somehow transported to the world of High School DxD. He could bring his unique ninja skills and chakra system. Maybe he teams up with Issei to fight against a common enemy. For example, a powerful devil or fallen angel that threatens both the ninja world and the DxD universe.
The theme of self - discovery can be seen as well. Characters from both series might be on a journey of self - discovery, and the addition of the Fallen Angel element can further complicate or enhance this journey. For example, a character might discover new powers or aspects of their personality due to their encounters with Fallen Angels. And of course, the theme of good vs. evil is always present, as the Fallen Angels can be seen as either a force of evil to be fought against or as complex characters with both good and bad sides that need to be navigated.
One possible fanfic could be about an angel who gets trapped in the Naruto world and has to adapt to its ninja ways while still retaining some of the powers and characteristics from the DxD universe. For example, the angel might use its holy powers in a new way to fight against the akatsuki.
A good Naruto and High School DxD fanfic would first have well - written characters. The author needs to understand the personalities of the characters from both series and make them act in a way that is true to their original selves. Also, an interesting plot is crucial. It could be something like a common threat that forces the characters from both universes to work together. For example, a new powerful enemy that neither Naruto's ninja skills nor High School DxD's magic can easily defeat.
A fanfic of this nature could explore different themes. One theme could be the clash between different power systems, that is, the ninjutsu from Naruto and the magic in High School DxD. The primordial god connection could act as a bridge or a source of conflict. Another theme could be about Naruto's journey of self - discovery in this new and strange world. He might have to adapt to the different social and power structures in High School DxD while also coming to terms with his new role as someone related to a primordial god.
One possible fanfic could be about Naruto being transferred to the High School DxD universe and his encounter with the Juubi there. Maybe he has to team up with the characters from High School DxD to deal with the threat of the Juubi. For example, Naruto's unique abilities like the Rasengan and Shadow Clone Jutsu could be a great asset in battles within this new universe.
One great 'Naruto - High School DxD' fanfic is 'Naruto in the World of High School DxD'. In this fanfic, Naruto is somehow transported to the world of High School DxD. It's interesting to see how his ninja skills and values from the Naruto world interact with the supernatural and often chaotic world of High School DxD. The author does a good job of integrating Naruto's character traits into the new setting, creating a unique and engaging story.
Power dynamics play a big role too. Naruto is a very powerful ninja, and in the High School DxD universe which is filled with powerful devils, angels, and other supernatural beings, how his power compares and how he uses it is a major aspect. He might have to learn new ways to use his chakra in a world where magic and sacred gears exist.
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.