Maybe there is an ancient prophecy in both worlds that foretells of a union between a wizard and a demon. Harry Potter and Rias Gremory are unknowingly the ones mentioned in the prophecy. As they are brought together, they first resist the idea as it goes against their own beliefs. However, as they face various threats, like a group of rogue wizards and demons who want to stop the prophecy from being fulfilled, they start to see the value in each other. They combine their unique magical abilities and ultimately fulfill the prophecy, bringing peace and a new era of cooperation between the two worlds.
Well, it could be really interesting. Harry could bring his magic skills from the wizarding world of Hogwarts. Maybe he'd introduce new spells to the world Rias is in. He might also form a strong alliance with Rias and her group, using his experience in fighting dark forces like Voldemort to help them in their battles.
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.
The story would change in many ways. Firstly, the power dynamics would shift. Harry has his own set of powerful magic, which could tip the balance in battles. Secondly, the relationships within the group would be different. Harry might have a different approach to problem - solving compared to Rias's group members. So, there could be some friction at first but also a lot of growth as they learn to work together.
Well, perhaps the plot could involve Rias Gremory taking Harry Potter under her wing in a world where the two fictional universes collide. She might use her devil powers to protect Harry from the threats in the wizarding world that Dumbledore couldn't handle. Harry could also learn some new skills from the devilish side of things, like enhanced combat abilities.
One idea could be that the OC is a new transfer student to the school where Rias Gremory is. They accidentally discover a hidden power within themselves that Rias is interested in. So she takes the OC under her wing, and as they train together, a deep bond forms between them.
In this fanfic, an interesting concept could be the power dynamics. Harry Potter has his own set of powers and skills, and Rias Gremory has her own abilities and her peerage. When they come together, there could be a whole new power structure. Maybe they form an alliance and have to figure out how to combine their powers effectively. It could also be about the exploration of different values. Harry Potter values friendship, courage, etc., while the Rias Gremory world might have different values related to loyalty within the peerage. This contrast could lead to some great character development and storylines.
Obviously, Harry Potter would be one of the main characters. He brings his own story, skills, and personality from the Harry Potter series. And Rias Gremory would also be a main character as she is from her own universe. Her leadership and unique abilities would play a major role. Hermione and Ron could also potentially be main characters as they are Harry's closest friends. In the Rias Gremory side, her peerage members like Akeno or Koneko might also be important characters in the fanfic.
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.
Well, 'The Crossover of Rias Gremory' is a fanfiction that you might like. It combines the world of Rias Gremory with other fantasy elements. In this fanfic, there are some really cool battles and strategic planning. The author does a great job of bringing out the unique abilities of Rias in the crossover scenario. It also explores some new relationships that Rias forms which add depth to the story.
One common theme is love and romance. Since it's about Rias Gremory and a male reader, there's often a development of a romantic relationship between them.