His complex personality. Riser is initially portrayed as a bit of a villain, but he has his own motives and insecurities. Fanfiction writers like to explore these aspects, like his pride which is both his strength and his weakness.
There might be a fanfiction where Riser Phenex discovers a new power within himself. This could lead to a whole new set of adventures as he tries to master it and also deal with the political implications within the Highschool DxD universe, like how other devil families react to his newfound strength.
A great fanfic idea could be that Rias and Riser are sent on a joint mission to the human world. They have to blend in as high school students. This would be a comical and interesting premise as they struggle to adapt to human life while also dealing with their own relationship. Rias might be more empathetic towards humans, while Riser could be more arrogant at first.
One possible fanfic could be about a friendly rivalry between Rias and Riser that turns into a mutual respect. For example, they could start competing in various magical challenges within the Highschool DxD universe. This would show their growth as characters and how they overcome their initial differences.
One possible fanfic could be about Riser and Kuroka forming an unlikely alliance. Maybe they start off as enemies, but due to some common goal, like protecting the underworld from a new threat, they have to work together. Their interactions would be filled with tension at first, as Riser is quite prideful and Kuroka is independent. But as time goes on, they start to understand and respect each other more.
In this fanfic, Riser and Kuroka might find themselves in a race against time. They could be competing with other factions in the Highschool DxD world to reach a certain place first. Maybe it's a place full of ancient magic that could give them an edge. Their different abilities would play a crucial role. Riser's fire - based powers and Kuroka's unique nekoshou skills would be used in creative ways to overcome obstacles.
Power - up is a common theme. Fans often write about Riser getting stronger in unique ways, like mastering new magical abilities or combat techniques. It adds an exciting element to the stories.
The main themes can vary widely. But often there is the theme of adaptation. Since she is in the High School DxD world, she has to adapt to different situations. Love is also a theme sometimes, whether it's romantic love or love for her comrades. And there's the theme of destiny, like what her true purpose is in this fictional universe which is full of magic, power struggles and various factions.
One common theme is power growth. Since Ravel is from the Phenex family, many fanfictions explore her developing her powers and how she uses them. Another theme is friendship. Ravel often forms new friendships or strengthens existing ones in these stories.
The Riser Peerage fanfiction stands out because it can take the often - overlooked aspects of the peerage and make them central. For example, the training and development of the peerage members can be a major focus. We might see how they train together, learn new skills, and bond as a group. Fanfictions can also introduce new challenges for the peerage, like dealing with a curse or a mysterious force that targets them specifically. This creates a sense of exclusivity and uniqueness compared to other parts of the Highschool DxD fanfiction world.