The main characters are Rias Gremory, who has her own set of powers and a leadership role in her devilish world, and Harry Potter, the young wizard. Rias would play a key role in shaping Harry's new path. Additionally, we might see characters like Dumbledore from the Harry Potter universe popping up to check on Harry. And from Rias's world, her servants or allies might be involved in the story as they interact with Harry.
For sure, Rias Gremory and Harry Potter are at the forefront. Rias with her alluring and powerful devil self, and Harry with his lightning - shaped scar and inquisitive nature. But don't forget about other important characters. In the wizarding world, Sirius Black could be relevant as he was an important figure in Harry's life. And in Rias's world, characters like Akeno Himejima might play a role in how Harry adapts to this new and strange world of devils.
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.
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.
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.
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.
Issei would be a great choice as he is from the same universe and has a strong connection with Rias already. Their relationship can be further explored in a crossover, especially if they are facing new and different challenges together.
Well, clearly Merlin and Harry Potter are the main characters. Merlin, with his powerful magic and wisdom from a different era, and Harry, the boy - who - lived from the modern wizarding world.
Obviously, the main characters would be Merlin, Harry Potter, and probably the founders would be mentioned or play some role in the background. After all, Merlin is from their era.
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.
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.
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.