Their relationships could develop in a very interesting way. Kiba, being a ninja, might be initially suspicious of Issei's more brash and perverted ways. However, as they are in this situation together under Rias, they start to understand each other better. Issei might learn some discipline from Kiba, and Kiba could become more open - minded because of Issei.
Perhaps they are hiding because they have stumbled upon a secret that many powerful beings in both universes don't want them to know. While under Rias, they start to figure out the mystery. Kiba might use his knowledge of chakra and ninja techniques to keep their hiding place concealed, and Issei could use his connection with the devils to gather some inside information. Along the way, they might make new friends or enemies from both Naruto and High School DxD worlds.
Some people might write such bashing fanfiction because they prefer other characters or storylines over Naruto, Rias, and Issei. Maybe they want to create a different narrative where these characters don't overshadow their favorites. It could also be a form of creative expression to explore how a story would be different without them.
Kiba has his Inuzuka clan abilities. His connection with his dog, Akamaru, could be very useful. For example, Akamaru could be on the lookout while they are hiding, sensing any approaching danger long before they do. Issei, on the other hand, if we consider his abilities from High School DxD, he has his boosted gear which gives him power. He could potentially use it to defend their hiding place if they are discovered.
One possible scenario could be that Naruto, with his shadow clone jutsu, creates a diversion that leads to an accidental explosion involving Kiba and his ninken. As for Issei, perhaps in a crossover setting, Naruto's Rasengan clashes with one of Issei's attacks and causes an explosion. However, this would require a lot of creativity to blend the two very different universes in a believable way.
The story could develop with Issei forming his own group. He might gather other characters who also feel left out or have similar goals. This new group could then become a rival to Rias' peerage, leading to interesting battles and power plays.
They could become friends. Naruto, with his friendly and open - minded nature, would be interested in Rias and her world. Rias, in turn, would be attracted to Naruto's strength and determination. They might start training together, sharing their combat techniques.
A fanfiction about Issei marrying Rias could explore the cultural differences within their world. Since Issei is human - turned - supernatural, and Rias is from a noble devil family. Their marriage could be a blend of human and devil traditions. They might incorporate elements like a human - style wedding reception with food and music, along with devilish ceremonies that are unique to Rias' family heritage. This would make their marriage a truly special and one - of - a - kind event in the fanfiction world.
At first, Naruto might be deeply hurt by the rejection. But this could lead him to become more introspective. He may start to question his own actions and motives more. For example, he might wonder if his way of approaching Rias was too brash or if he misread the situation entirely.
For the Naruto fandom, bashing fanfiction could potentially turn some fans away from the overall fanfiction community if they feel that their beloved character is being unfairly targeted. In the case of Rias and Issei's fandoms from High School DxD, it could create a stir as well. Some fans might engage in debates with the writers of the bashing fanfiction, trying to defend the characters. This can lead to both positive and negative interactions within the fandoms. On one hand, it can spark discussions about the characters' qualities, but on the other, it can also lead to a hostile environment if not handled properly.
Their relationship could develop further through shared challenges. For instance, if they face a really tough opponent together, they'll learn more about each other's strengths and weaknesses, and that can deepen their bond. Another way is through communication. If Issei starts to open up more about his insecurities and Rias does the same, they can become closer on an emotional level.