Well, it could be due to their different personalities. Naruto is all about hard work and loyalty to his friends in his own universe. Rias Gremory has a more complex and sometimes manipulative personality in her story. In fanfiction, the writer might want to create a conflict by making Naruto dislike her, perhaps because he sees her methods as being at odds with his own values.
One potential plotline could be Naruto being summoned to the world of Rias by accident. He then has to figure out how to get back home while also getting involved in the power struggles within the devil world. Maybe he becomes a key player in a battle for control of a certain territory.
One idea could be that Naruto is somehow transported to the world of Rias Gremory. He, with his strong sense of justice and determination, catches Rias's eye. They start off as friends, training together. As they spend more time, they realize their feelings for each other. Naruto's unique powers also intrigue the other devils in Rias's peerage.
In a Naruto and Rias Gremory fanfiction, Naruto's chakra system could interact in interesting ways with the magic in Rias's world. His ability to control and manipulate chakra might be seen as a form of power that the devils would either fear or try to understand. Rias, on the other hand, could introduce Naruto to the political and social aspects of her world. They could also exchange combat techniques, with Naruto showing the devils how to move with the speed and stealth of a ninja, and Rias's group teaching Naruto some devil - specific magic that could enhance his abilities in different ways.
One possible idea for this fanfiction could be Naruto being transported to the world of High School DxD. He might end up attending the same school as Rias. Given Naruto's strong sense of justice and his combat skills, he could quickly become involved in the supernatural battles and power struggles in that world. He might also form an interesting relationship with Rias, perhaps starting as friends and gradually developing into something more as they face various challenges together.
Naruto is very outgoing and has a big heart. He's always looking to make friends and help others. Rias is a strong and confident leader. Naruto's friendliness could soften Rias's more serious side. Rias, in turn, could help Naruto better understand leadership and strategy, which he might lack a bit in his own world.
The cultural differences between Naruto's world and Rias's world could play a part. Naruto's world has a strong sense of community and loyalty within the ninja clans. Rias's world of devils has a more hierarchical and self - serving structure. These differences could cause Naruto to have a negative view of her in fanfiction.
A plot twist might involve Rias having to choose between her duties in the Gremory clan and her love for Naruto. This could create a lot of internal conflict for her and also put a strain on their relationship. For example, she might be forced to enter an arranged marriage for the sake of her clan, but she really loves Naruto. This would lead to a complex and emotional storyline.
Definitely. However, the quality can vary a great deal. Some might explore their relationship in a more in - depth and emotional way, showing how their love has developed over time. Others could take a more action - packed approach, with their marriage being a backdrop to battles and adventures they embark on together.
One idea could be that Harry Potter, while on a mysterious magical journey, stumbles upon the world where Rias Gremory exists. They initially misunderstand each other due to their different magical backgrounds. Harry is used to wands and spells, while Rias has her own demonic powers. But as they get to know each other, they start to learn from one another and combine their powers to face a common enemy that threatens both their worlds.