Perhaps in the fanfic, Kiba is shown as being overly arrogant about his ninja skills when compared to the supernatural abilities in High School DxD. This arrogance could lead to him making mistakes and getting in trouble, which in turn causes the other characters to look down on him. The plot could then revolve around how he tries to redeem himself or continues to spiral downward in the eyes of the other characters.
One possible plot could be that Kiba is made out to be a bully in the High School DxD setting. He could be picking on characters from the DxD world, which angers the main characters from that series. This then leads to a conflict where the DxD characters team up with some Naruto characters who also don't like Kiba's behavior.
In this type of fanfiction, the author might be trying to create a new narrative by bashing Kiba. It could be that they have a particular vision for how the Naruto and High School DxD worlds blend together. Maybe they think Kiba's character doesn't fit well in their idea of the crossover, so they use him as a sort of 'villain' or an obstacle for the other characters to overcome. This can add drama and a new layer of storytelling to the fan - made universe.
One idea could be Kiba getting involved in a secret magical tournament within the school. Another could be him forming a special alliance with an unexpected character to solve a mystery. Maybe he discovers a new power that changes his role in the school's supernatural hierarchy.
A possible plot could be that Naruto is somehow transported to the world of High School DxD. He's seen as a delinquent because he doesn't follow the school's rules which are very different from what he's used to in Konoha. He might start fights with some of the devils or fallen angels in the school who underestimate him. As the story progresses, he forms alliances with some of the students and they work together to solve problems in the school, like stopping a powerful enemy that threatens both the human and supernatural students.
Well, it could be that Naruto, as a Nephilim, enters the High School DxD world. He might use his ninja skills along with his new Nephilim powers. Maybe he has to deal with the devils and angels in the school setting, while also trying to keep his identity a secret. He could form new alliances and rivalries within the school, all while facing challenges that are unique to this crossover world.
Perhaps in this fanfiction, Naruto and Kushina are reincarnated in the High School DxD world. They have to adapt to the new school life there. Naruto would surely stand out with his determination and fighting abilities. Kushina would be a motherly figure to some of the students who lack that kind of support. They both could change the balance of power between the different factions in the world.
One great 'High School DxD Kiba Fanfiction' is 'Kiba's Ascent'. It really delves into his character development, showing his growth as a warrior and his relationships in a new light. The story has some exciting battles and also some heart - warming moments between Kiba and his friends.
The popularity of 'High School DxD Kiba Fanfiction' is mainly due to the character of Kiba himself. He is a very likable character in the original series, and fans want to see more of his story. Fanfiction allows writers to explore different aspects of his character, like his past or potential future relationships.
Perhaps the plot revolves around a conflict between the ideals of the Naruto world and Issei's actions in Highschool DxD. The Naruto characters, with their strong sense of justice and camaraderie, see Issei as a threat to the harmony of the new world they find themselves in. So they begin a sort of campaign against Issei. This could involve things like trying to expose his wrongdoings to the other characters in the Highschool DxD world, and at the same time, using their own powers and skills to undermine Issei's position in the school and in the supernatural hierarchy.
One possible plot could be that Naruto and Hinata are transferred to the High School DxD world. Naruto's powerful ninja skills might make him stand out, while Hinata's shy yet strong - willed nature could attract different reactions. Maybe they have to face the devils and angels in this new world together, with Naruto using his Rasengan and Hinata her Gentle Fist techniques to protect their new friends and find a way back to their own world.
One possible plot could be that Naruto, who is now half - youkai, gets transferred to the High School DxD world. He has to hide his true identity at first but then gets involved in the power struggles between the different factions. Maybe he uses his ninjutsu and new - found youkai powers to protect his friends and the school from a common enemy.