What are some interesting plot ideas for a 'rias gremory x oc fanfiction'?

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.

One idea could be that the OC has a unique power that helps Rias and her harem in unexpected ways. For example, the OC might be able to sense danger before it arrives, allowing them to better prepare for battles against other factions. Another plot could involve the OC having a past connection to one of the members of Rias' harem, which creates some drama and tension as they navigate their new relationships within the harem. Maybe the OC is a long - lost relative or an old friend who has changed a great deal.

You can start by giving the OC a unique backstory. For example, if they are a human, they could have had a strange encounter in their childhood that awakened a latent power. This backstory can shape their personality, like if they had a tough childhood, they might be more cautious or distrustful at first.

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.

One idea could be that the male OC has a unique power that Rias needs to protect her peerage. So they start working closely together, and slowly feelings develop. For example, the OC might be able to sense impending danger to the group in a way no one else can.

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.

A more complex plot could be that there is a powerful enemy that threatens both Naruto's world and the world of Rias. Naruto and Rias's harem have to team up to defeat this enemy. Along the way, they face many challenges that test their abilities and relationships. Naruto's positive attitude and never - give - up spirit start to influence the members of the harem, and they in turn show Naruto new ways of using magic and power.

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.

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.

One idea could be that the OC is a healer who stumbles upon Frankenstein's monster in the woods. The OC decides to help the monster, despite the danger, and they form an unlikely bond. This could lead to a story of redemption for the monster and a journey of self - discovery for the OC.