What are some interesting plot ideas for 'Supernatural Highschool DxD Fanfiction'?

A plot could involve the main characters having to form an alliance with Trihexa to face an even greater threat. They would have to find a way to communicate and work with it, which would be a huge challenge considering its nature. This could lead to some interesting character development, especially for Issei as he tries to understand and tame Trihexa.

Well, a plot could revolve around a mystery that involves both worlds. Maybe there is an ancient artifact that has the power to disrupt the balance between the Naruto universe and the Highschool DxD universe. Characters from both sides have to work together to find and protect this artifact. This would lead to a lot of character development as they learn about each other's cultures and values while on this quest.

A plot could also focus on a new character who is a hybrid of the two universes. They have the powers of both a devil from High School DxD and a wizard from Harry Potter. They struggle to find their place in either world as they are too different from the norm in both, and they embark on a journey to create their own identity and purpose.

A plot could involve a nekoshou trying to fit into the high school environment while hiding their true nature from most students. But then they get involved in a magical tournament where they have to use their nekoshou abilities to win and prove themselves. Or perhaps a nekoshou is on a quest to find a lost nekoshou artifact that has a connection to their family's past in the Highschool DxD universe.

One idea could be Sora being a new exchange student at the school in the Highschool DxD universe. He could bring with him unique powers or knowledge that intrigue the main characters. For example, he might have a special type of magic that is different from what is commonly known in their world.

One idea could be an alien race coming to Kuoh Academy with unique powers that the devils, angels and fallen angels have to deal with. For example, an alien race that can manipulate time, causing chaos in battles and daily life.

One idea could be a new devil character arriving at Kuoh Academy with a unique power that challenges the existing power dynamics among the devils there. For example, a devil who can manipulate time in small increments during battles, which would make for some really intense and strategic fight scenes.

Perhaps a plot where the dragonborn has to adapt to the modern world of Highschool DxD while also hiding their true nature. They might struggle with the different social norms and also have to keep their dragon powers a secret from most people, except for maybe Issei and his friends who could help them fit in.

One common plot idea is exploring different relationships between the characters. For instance, a fanfiction might focus on a deeper friendship between Issei and Kiba that wasn't fully explored in the original. Another idea could be an alternate universe where the characters have different powers or roles.

One idea could be a new character arrives at the school who has a unique power that disrupts the existing power balance among the student groups. Another could be a time - travel plot where a character goes back in time to change an important event in the Highschool DxD universe. Maybe a crossover with another popular anime, where characters from both shows interact in the Naruko Highschool DxD setting.