Perhaps a plotline where the characters in the harem form a sort of alliance to protect Ophis from other threats in the 'Highschool DxD' universe. They could train together and develop new powers or abilities.
One interesting plotline could be Issei and Ophis going on a journey to discover more about Ophis' past powers. Since Ophis is such a powerful being, exploring her origins while in a relationship with Issei can add depth. For example, they might encounter ancient beings who knew Ophis when she was first created.
There could be Issei from the 'Highschool DxD' series. He might be involved in the fanfiction, perhaps having a different relationship with Ophis compared to the original series.
The fanfiction might also focus on Ophis' powers and how they could be used in different scenarios. It could show her in situations where she has to make difficult decisions based on her abilities, adding depth to her character. Additionally, the lemon aspect, if tastefully done, can add a new layer of romance or tension to the story.
One plot idea could be that Naruto is somehow transported to the world of Highschool DxD and meets Ophis. Maybe he has to help the characters in Highschool DxD deal with a threat using his ninja skills, and in the process, he forms an alliance with Ophis.
One popular plotline is the self - insert character gradually building relationships with different members of the harem. For example, they might start by befriending a few characters and then over time, romantic feelings develop. Another is the self - insert getting involved in the battles and power struggles in the Highschool DxD universe while also dealing with the harem dynamics. It could be that they have to prove themselves worthy to be part of the group and in the process, win the hearts of the harem members.
One great Issei and Ophis fanfiction could be where they team up to face a new powerful enemy. In this type of story, their unique abilities combine in interesting ways. For example, Issei's boosted gear and Ophis's dragon powers could create some really cool fight scenes. It might also explore their relationship further, perhaps showing how they grow to trust each other more on a deeper level.
Yes, there might be such fanfictions out there. Fanfiction often combines different fictional universes in creative ways. However, not all of them are well - known or of high quality. Some might be more focused on the unique interactions between the characters from Naruto and Highschool DxD, exploring how their different powers and personalities would mesh in an unexpected relationship.
There is also a fanfiction called 'Ophis and the School Festival'. In this story, Ophis gets involved in the school festival preparations. It has a lot of humorous moments and also some great character interactions. For example, her interactions with Issei and the other members of the Occult Research Club are really well - written.
In a Highschool DxD - Naruto crossover fanfiction with Ophis, she could form an alliance with some of the Akatsuki members. They might be interested in her power and knowledge. Ophis could use this opportunity to learn about the unique chakra system in Naruto. This could lead to a series of battles and power - up scenarios as she tries to adapt to this new world and the Akatsuki tries to use her for their own goals.
One interesting plot idea could be the Son of Ophis struggling to fit into the world of Highschool DxD. He might have powers that are both a blessing and a curse. For example, his powers could attract unwanted attention from various factions in the supernatural world, leading to constant battles and challenges.