Yes, there might be such fanfictions out there. Fanfiction writers often create crossovers where they put characters from different universes like Naruto and High School DxD together and come up with various scenarios, including ones where Naruto could potentially 'kill' a character from the DxD universe. However, the quality and nature of these fanfictions can vary greatly.
There are several. 'Reincarnated as a God in Another World' is one where the MC is a god. The story follows his adventures and challenges in the new world.
It would probably be really interesting. Naruto's skills and abilities as a 'god' would likely disrupt the normal flow of the Highschool DxD world. Maybe he'd use his ninja techniques in battles against the devils and angels in that universe.
Rias could also be a popular character. She is a powerful devil and her leadership skills could be put to the test in a story that combines Highschool DxD with the God of War. Maybe she has to negotiate with the God of War characters or lead her group against a common enemy from that realm.
Well, it could be really intense. Naruto has his powerful jutsu and abilities. If he were to kill a character in DxD, it might start with a misunderstanding or a power struggle. For example, if the DxD character underestimated Naruto's power, it could lead to a quick and unexpected end for them. Maybe Naruto would use his Rasengan or Sage Mode to take on the DxD character.
A possible plotline could be a battle royale - style story where characters from both God of War and DxD are pitted against each other in a tournament. The winner gets some ultimate power or prize.
One common theme is friendship and alliances. Naruto is known for making friends and in the DxD fanfiction, he might form new alliances with characters from DxD. Also, the theme of self - discovery. As Naruto enters a new world, he has to learn about himself in this different context. For example, how his ninja way might change or stay the same. And of course, there's often the theme of combat. Since both series have a lot of action, seeing Naruto fight in the DxD world against different opponents is a big draw for these fanfictions.
One interesting concept could be the unique powers an original character (OC) might possess as a god. For example, they could have the power to manipulate time on a grand scale, which would add a whole new dynamic to the story. Another concept might be how the OC god interacts with the existing characters in the Highschool DxD universe. They could form alliances or rivalries that change the course of the story.
In some fanfictions, there might be a plot where the world of Highschool DxD is merged with the realm of the God of War. This would lead to all kinds of chaos as the characters from both universes interact. For example, the devils in Highschool DxD might be intrigued by the brutal and straightforward combat style of the God of War characters, and they may try to adapt it to their own battles. It could also lead to interesting power - up scenarios as they learn from each other.
A popular OC in this fanfiction could be a god of knowledge. They are highly intelligent and know a great deal about the secrets of the Highschool DxD universe. This character might help the main characters solve difficult problems or understand complex magic. Additionally, an OC god of the underworld can be very interesting. They have control over the dead and dark magic, which gives them a mysterious and powerful presence in the story.