In some cases, it could be that the author of the fanfiction simply wants to explore a different narrative where Rias is not the 'perfect' character she is often portrayed as in the main series. They might want to create a more complex or alternative view of the Naruto DxD universe by highlighting what they see as flaws in Rias's character.
A common theme could also be her role as a leader. Fanfiction authors might write about her being a bad leader, making wrong decisions that lead to negative consequences for her group. This could be a way for the author to explore different leadership styles and show how things could go wrong under Rias's leadership.
In the case of 'dxd rias bashing fanfiction', it could be centered around different aspects. It might be that the author has a different vision for the 'dxd' world and Rias doesn't fit into that vision as she is in the original. So they create a fanfiction to bash her character. It could also be due to personal preference of the author. They might prefer other characters over Rias and use the fanfiction as a platform to show why they think Rias has negative qualities. Another possibility is that they want to explore how the story would change if Rias was not the 'perfect' character as she seems in the original, so they write a bashing fanfiction to break her down and see what new stories can emerge.
He might react with hostility. Dark Naruto has a certain edge to him, and if he sees Rias as a threat or someone he doesn't like, he'll likely oppose her. He could use his combat skills to challenge her directly.
Well, in such a fanfiction, Dark Naruto might use his powerful and often shadowy abilities to outwit Rias. Maybe he'd expose some of her less - than - noble actions in the Highschool DxD world. He could easily overpower her in battles, using his ninja skills and the dark powers he has. For example, his shadow clones could be used to confuse Rias and her peerage while he strikes from the shadows.
One possible plotline could be that Naruto is transported to the Highschool DxD world and immediately notices Rias's overbearing attitude. He decides to oppose her and starts to gather allies among the other students and characters who are also fed up with her ways. As a result, a power struggle ensues between Naruto and Rias.
Well, it could involve Naruto characters being thrown into the Highschool DxD universe and having some sort of conflict with Rias. Maybe Naruto's skills and values clash with Rias's actions or leadership in the story. For example, Naruto might see her as too power - hungry or not treating her underlings fairly.
You can try searching on some well - known fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just use the keywords 'dxd rias bashing' in their search bars.
One potential new protagonist could be Issei's other friends or comrades. Since Rias is being bashed in this type of fanfiction, they might get more screen time and development. For example, Kiba could step up and show his leadership skills and unique abilities more.
Well, one interesting aspect could be the exploration of different character dynamics without Rias being in a central positive role. It might show how other characters develop in a new light. For example, other devils or supernatural beings could step up and show their capabilities more prominently.