What are some interesting plot ideas for 'highschool dxd god crossover fanfiction'?

One idea could be exploring a new Godly power that the main character discovers within the Highschool DxD universe. Maybe it's a power that has been long forgotten and its emergence shakes up the existing power dynamics among the devils, angels, and fallen angels.

One idea could be that Inuyasha gets transported to the world of Highschool DxD. He might mistake the devils and angels there for demons from his own world and start attacking them. This would create chaos and also lead to some interesting alliances as the characters from Highschool DxD try to figure out who he is and why he's there. Another plot could involve a shared enemy. Maybe a powerful demon from Inuyasha's world somehow makes its way to the Highschool DxD universe and starts causing trouble for both groups. They would then have to combine their powers and knowledge to defeat it.

One interesting plot could be the characters from Highschool DxD somehow ending up in the Bleach universe. Maybe Issei and his friends are mistaken for Hollows due to their demonic energy and are hunted by Soul Reapers. They then have to prove their innocence while also learning about the complex spiritual world of Bleach.

Well, there could be a plot where the Sacred Gears in Highschool DxD are somehow connected to the ninja powers in Itachi's world. Itachi discovers that some of the students with Sacred Gears have a latent ninja ability within them. He then decides to train these students to help them control and enhance their powers. In return, the students of Highschool DxD help Itachi understand the complex social and power dynamics of their world, which is very different from his own.

A cool plot idea could be a tournament where characters from both Highschool DxD and Naruto participate. The ninjas would show off their jutsu and the devils would display their powers. Also, imagine if Naruto got a Sacred Gear. He could use it to enhance his Rasengan or even create a new jutsu that combines his ninja abilities with the power of the Sacred Gear. Or perhaps, the female characters from Highschool DxD like Rias could teach some of the kunoichi in Naruto about different ways of using their femininity as a power, which could lead to some interesting character development for the kunoichi.

Another plot could involve the Quincy from Bleach. Uryu could be mistaken for a Devil by some of the Highschool DxD characters because of his unique powers. This misunderstanding could lead to a conflict at first, but then they realize they are all on the same side against a greater threat, like a powerful fallen angel who is trying to start a war between the Hollows, Devils and Quincies.

Maybe the dragons from Fairy Tail are related to the dragons in Highschool DxD in some ancient way. So, characters like Igneel might have a connection to the dragon in DxD. This could lead to a search for the truth about their origins and a fight against a common enemy that threatens both worlds.

A plot could revolve around an OC Dragon God who forms an unlikely alliance with Issei. They could team up to face a greater threat that neither the devils nor the angels are fully aware of. The OC could bring in their unique dragon god powers and knowledge to help Issei level up in a different way, adding a new dynamic to the story.

Well, an interesting plot might involve an OC Dragon God who has lost their memories and has to rediscover their powers and identity while interacting with the characters in Highschool DxD. They could start off as a seemingly ordinary student, but as the story progresses, strange things start to happen that hint at their true nature. Also, an OC Dragon God could come from a different dimension and bring with them unique powers and knowledge that change the dynamics of the Highschool DxD world. Maybe they have a special connection to one of the main characters that has been fated since long ago.

Maybe in the fanfiction, the Campione characters are invited to the Highschool DxD world to participate in a special tournament. They bring their own unique skills and knowledge, and during the tournament, they form unexpected alliances with the devils, angels, and fallen angels. This would allow for a lot of character interactions and development.