Well, it could be about an original character (OC) who is an ice storm dragon in the Highschool DxD universe. Maybe the OC is trying to find its place among the various factions in the school. It could get involved in battles against other supernatural beings and form unexpected alliances.
In a 'highschool dxd oc ice storm dragon fanfic', the story could center on the OC's relationships. It might fall in love with a character from one of the groups in the school, like a devil girl. But this relationship could be complicated due to the differences between their species. Also, the OC could be on a quest to master its ice storm dragon abilities, which could lead to it facing off against powerful enemies and uncovering secrets about the world of Highschool DxD.
Obviously, the main character would be the original character, the ice storm dragon. But there could also be characters like Issei Hyoudou. He might interact with the OC, either as an ally or an adversary. Another possible main character could be Rias Gremory, as she is a key figure in the Highschool DxD world and could have some sort of connection with the ice storm dragon OC.
Well, a great plot could involve a power struggle within the world of Highschool DxD related to the Ice Storm Dragon. For instance, different factions might be vying to control the power of the Ice Storm Dragon for their own purposes. The fanfic could focus on how the protagonist gets caught in the middle of this struggle and has to navigate through various challenges, including political intrigue and battles, to either protect the Ice Storm Dragon or prevent its power from being misused.
You can give the character a special connection to the Ice Storm Dragon. Maybe they were born during an Ice Storm Dragon's roar or something like that. This connection could give them unique powers related to ice or dragon - like abilities.
A good plot idea could be that the OC Dragon God has to hide their true identity in the high school. They are there to find a certain magical item that is hidden in the school. As they search, they get involved with the main characters and have to deal with the normal high school drama as well as the supernatural threats that come their way.
One idea could be an OC who is a dragon slayer but has a unique power that sets them apart. For example, they can absorb the powers of the dragons they slay instead of just killing them. This could lead to all kinds of new storylines as they become more powerful and are hunted by both good and bad forces in the Highschool DxD universe.
The plot might center around the fairy OC trying to fit into the world of Highschool DxD. Since she's a fairy, she could bring a new element of magic and mystery. For example, she could be on a quest to find a lost fairy artifact in the Highschool DxD universe, which leads her to interact with different characters and form alliances or rivalries. She might also have to deal with the fact that fairies are not common in that world and face some prejudice or misunderstanding from other characters.
Well, it could be about the OC, as the son of Thor, coming to the Highschool DxD world and showing off his godly powers. Maybe he'd have to deal with the various factions in the school, like the devils, angels and fallen angels, while also trying to fit in.
One possible plot could be that the OC gamer, being a huge fan of the Highschool DxD world in his own gaming realm, somehow gets transported into the world. He then meets Raynare. Maybe at first, Raynare tries to use him for her own purposes as she usually does. But as the story progresses, the gamer's unique skills from his gaming world start to change her perception of him. For example, he might be able to analyze situations like he does in games and come up with strategies that no one in the Highschool DxD world has thought of. This could lead to an interesting dynamic between them, with Raynare slowly starting to trust the gamer and they end up on some kind of adventure together.
Well, it could start with the discovery of the OC's identity as Grayfia's son. This would surely stir up a lot of reactions among the different factions in the Highschool DxD universe. He could be thrust into various adventures, like having to protect a certain character or retrieving a powerful artifact. His relationship with his mother, Grayfia, would also play a significant role, perhaps she has certain expectations of him that he struggles to meet while also dealing with his own desires and goals.
The plot could also involve Naruto being mistaken for a new type of devil or a strange being in the Highschool DxD world. His chakra could be seen as a very unique power source. He might have to go to the high school in the DxD world and get into all kinds of adventures, like dealing with the pervy situations that Issei often finds himself in, but with his own Naruto - style humor and strength.