Well, some storylines involve the OC dragon having a special bond with one of the main characters from Highschool DxD. This bond could be based on a shared goal, like finding a powerful artifact that is important to both the dragon and the character. It could also be a more emotional bond, like the OC dragon helping a character through a difficult time. There are also storylines where the OC dragon is an outcast from their own dragon clan and has to prove themselves in the world of Highschool DxD.
One popular storyline could be the OC's struggle to control the power of the Red Dragon Emperor. For example, they might face challenges in taming the intense and sometimes uncontrollable power within them. Another could be their relationships with the existing characters from Highschool DxD. They might form alliances or rivalries with Rias and her peerage. Also, a story could revolve around the OC uncovering secrets related to the Red Dragon Emperor heritage that were previously unknown, leading to new adventures and battles.
One popular storyline could be Gabriel's interaction with the main characters from Highschool DxD in a more peaceful school setting. For example, she might be involved in a friendly competition among the different factions at the school. Another could be a story where Gabriel has to adapt to the modern human world while still maintaining her angelic duties. She could face challenges like understanding modern technology or human emotions.
The 'Redemption' trope is often seen in 'Highschool DxD White Dragon Emperor OC Fanfiction'. Maybe the OC has a dark past that they are trying to atone for, and their relationship with the White Dragon Emperor helps in that journey. The 'Alliance' trope is also popular, with the OC forming an alliance with the White Dragon Emperor against a common enemy. This can lead to epic battles and strategic planning within the fanfiction. And don't forget the 'Discovery' trope, where the OC discovers something new about the White Dragon Emperor or vice versa, which can change the course of the story.
One popular storyline could be a crossover where characters from 'King of the Holl' interact with those from 'Highschool DxD' in a battle for supremacy. Maybe the power dynamics between the different species in both universes are explored. Another could be a story where a character from one series tries to adapt to the rules and culture of the other series. For example, a character from 'King of the Holl' having to deal with the school life and devil politics in 'Highschool DxD'.
One idea could be a dragon OC that has the ability to transform into different elemental forms. For example, it can be a fire - breathing dragon in combat situations, but a water - based dragon for healing or stealth purposes. This would add an interesting dynamic to the story as it could befriend different characters based on its form.
One interesting storyline could be the Red Dragon Emperor exploring new powers. For example, he might discover a hidden aspect of his Boosted Gear that allows him to access a different form or ability. This could lead to him having to train in new ways and face challenges that he wasn't prepared for before.
There is also 'OC's Adventure in Highschool DxD'. This story stands out because the OC is not just a bystander but actively changes the course of events in the Highschool DxD world. It has exciting plot twists and the development of the OC's powers over time is really fascinating.
In Highschool DxD OC fanfiction, the 'Power - Up' trope is quite common. Your OC starts with a certain level of power and then, through training, battles, or special encounters, they gain more power and become stronger. The 'Redemption' trope can also be used. If your OC has made mistakes in the past or has a dark history, they can strive to redeem themselves throughout the story. Also, the 'Chosen One' trope works well. Your OC could be the one chosen to save the supernatural world from a great threat, like an impending war between devils, angels, and fallen angels. This gives them a sense of purpose and importance in the story.
A fanfiction might explore a story where the Occult Research Club members are all transported to a different dimension. In this new world, they have to find a way back home while facing new enemies and challenges. Rias could use her leadership skills in a different way, and Kiba might discover new powers within himself to protect the group. This would also test the bonds between the characters in a whole new setting.
Well, in these fanfictions, a common plot twist is the revelation of a unique ability. Say, the OC dragon hybrid can communicate with all types of dragons, which gives them an edge in battles and negotiations. Sometimes, the plot twists involve relationships. For instance, the OC might be betrothed to a powerful character without their knowledge, and this creates a whole lot of drama. And then there's the plot twist where the OC's dragon side is suppressing a dangerous entity, and when it's released, it changes the whole story dynamic.