Maybe a story where Alucard, Naruto, and a character from DxD end up in a strange new dimension. Naruto uses his ninja skills to scout the area, Alucard provides protection with his vampiric abilities, and the DxD character uses their own powers to try and find a way back home. Along the way, they have to face new and dangerous enemies that are a mix of all three universes.
A fanfiction could explore the idea of Naruto being turned into a vampire by Alucard in the DxD universe. He then has to struggle with his new vampiric nature while still holding onto his ninja values. He could use his new powers in unique ways, like using his speed to perform ninjutsu faster. And he would have to deal with the politics and power struggles in the DxD world as a half - vampire, half - ninja.
One interesting idea could be the fusion of Naruto's ninja abilities with the supernatural elements from High School DxD. For example, Naruto's shadow clone jutsu combined with the devils' powers in DxD could create some really cool battle scenarios.
Well, in 'naruto godlike dxd fanfiction', perhaps the concept of Naruto having god - like powers in the DxD setting is exciting. He could potentially change the power balance in that world. His rasengan might be enhanced to a level that it can even damage the most powerful devils or angels. Also, his ability to make friends and influence people, as seen in the Naruto series, could lead to some really unique alliances in the DxD world, like uniting different factions that were previously at odds.
Well, one idea could be the fusion of Naruto's unique jutsu with the DxD universe's magic system. For example, Naruto might use his shadow clone jutsu in a new way within the DxD battles. Another aspect could be the character interactions. Evil Naruto might form unexpected alliances or rivalries with the DxD characters. Maybe he would see some of the devils as kindred spirits in his new evil state.
Well, a plot could involve Naruto learning about the Devil Pieces in the DxD world and trying to figure out a way to use his chakra in a similar way to reincarnate or empower allies. Or maybe some of the DxD characters end up in the Naruto world and have to adapt to the different power systems there, like learning how to use ninjutsu.
One idea could be a crossover where Naruto characters gain the powers of DxD characters. For example, Naruto could get the power of Issei's Boosted Gear and use it in combination with his own chakra powers. This would create some really cool battle scenes and new power - up scenarios.
One interesting storyline could be Alucard forming an unexpected alliance with the main characters in High School DxD. Maybe he uses his unique powers to help them in a battle against a common enemy.
One idea could be a story where Naruto and Rachel Alucard are brought together by a strange magical anomaly. They have to learn to work together to solve the mystery behind it and in the process, they discover new powers within themselves. For example, Naruto could teach Rachel about the power of friendship and determination, while Rachel could show Naruto some unique vampire - related magic.
Perhaps a story where Kuroka transfers to the high school in the Highschool DxD setting and she meets Naruto who is also there for some reason. They could form an unlikely alliance against common enemies. Kuroka's cat - like abilities and Naruto's combat prowess would make for an interesting team - up. And they could also have some comical moments as Naruto tries to understand the strange rules and hierarchies of the Highschool DxD world.
One idea could be that Naruto and Sasuke are transported to the DxD world and they have to learn the new rules and powers there. They might team up with some of the DxD characters to face a common enemy.
A possible plot is that Naruto, mute as he is, discovers a new form of magic in the DxD universe that is related to silent communication. This could lead to him becoming a very powerful figure as he can communicate secretly with his allies during battles. Also, his backstory from Naruto could be intertwined with the DxD lore. For instance, his experience with loneliness in his own world could make him more empathetic towards the devils in DxD who are often misunderstood. He could then try to bridge the gap between different factions in the DxD world.