In a fanfiction where Naruto is adopted by Rias, there would be a significant cultural clash at first. Naruto comes from a world of shinobi where loyalty to the village is key, while Rias's world has its own set of values regarding loyalty to the devil clan. However, Naruto's growth potential is huge. His rasengan could potentially be modified with the magic in Rias's world. He could also teach some of his ninja training methods to the members of Rias's peerage, enhancing their combat capabilities. And his experience with fighting powerful enemies in his own world would give him an advantage when dealing with threats in Rias's world.
Perhaps in this fanfiction, Naruto has lost his way in his own world and somehow ends up in Rias' realm. Rias, being kind - hearted, adopts him. Naruto would have to adapt to a whole new set of rules and powers. He might face challenges from other groups who are suspicious of this new addition, but with his ninja spirit, he overcomes them.
Naruto and Rias are bound to be the central characters. Naruto with his determination and power, and Rias with her leadership and magic. But we can't forget about the other members of Rias' peerage. They might have different reactions to Naruto being adopted. Some could be welcoming, while others might be a bit skeptical at first. And Naruto's own comrades from Konoha might also be relevant, perhaps in flashbacks or if they somehow cross over into Rias' world.
If Naruto was adopted by Rias in fanfiction, his life would take a completely new direction. He would be in a world full of magic and supernatural beings. His daily routine would change from ninja training to learning about devil magic and the ways of Rias's peerage. His relationships would shift too. He might form strong bonds with the members of Rias's group, sharing his own stories of growing up as an outcast in the ninja world. His combat style would also evolve as he incorporated elements of devil magic into his ninja techniques. And his presence could potentially change the power dynamics within Rias's peerage, bringing new strategies and ideas to their battles and operations.
One possible fanfiction idea could be that Rias' sick brother is a key factor in a power struggle within their supernatural world. Naruto, being an outsider with his own set of skills and values, could get involved. Maybe he forms an alliance with Rias to protect her brother from those who would use his illness to their advantage.
They would likely start with some mutual curiosity. Naruto would be intrigued by Rias's devilish appearance and powers, while Rias would be interested in Naruto's ninja abilities. They might exchange stories about their respective worlds, with Naruto talking about his village and his friends, and Rias sharing about the devil society. Interaction could also involve sparring sessions to test each other's strength.
Definitely. The concept of combining different fictional universes in fanfiction is quite common. In a 'Naruto is Rias' Familiar' fanfiction, we could expect to see Naruto's ninja skills and powers being incorporated into the world of High School DxD. Maybe Naruto would use his shadow clone jutsu in battles in the DxD universe or his rasengan against some of the devils. It could also explore how Naruto, with his strong sense of justice and loyalty, would interact with Rias and the other characters in her peerage.
In this fanfiction, Naruto might show his jealousy in his typical brash way. He could be all fired up and ready to challenge the person who is making him jealous. Rias, on the other hand, would be more calculating in her jealousy. She might use her devilish powers and influence to subtly drive a wedge between the person causing the jealousy and the object of her affection. They could end up teaming up to get rid of the 'competition' in a rather comical or intense way depending on the tone of the fanfiction.
It's quite possible. Fanfiction writers often come up with interesting and unexpected concepts. Since Naruto and the world of Rias have their own distinct fan bases, combining them in a story where Naruto is a fan of Rias can add a new and exciting twist. You could also check fan - run forums dedicated to either Naruto or High School DxD to see if anyone can point you in the direction of such a fanfiction.
They could go on adventures to stop powerful demons that threaten the balance of the DxD world. Naruto's combat skills and Rias' leadership would make them a formidable team. They might also travel to different dimensions in search of rare items or knowledge. For instance, they could explore a dimension where there are unique forms of magic that Naruto could learn to combine with his chakra.