Issei Hyoudou can also be a popular character in these fanfictions. His growth from a normal human to a powerful devil is an interesting arc. In Si Sitri fanfiction, he could interact with the Sitri family in various ways, perhaps getting involved in their schemes or forming relationships with the Sitri characters.
I find Tsubaki Shinra, who is part of the Sitri group, quite appealing in fanfictions. Her loyalty to Sona and her growth as a character, especially in terms of her combat abilities and relationships, are well - written in some of the better fanfics.
A cool plot might involve the Si Sitri character forming an unexpected alliance with other factions in the Highschool DxD universe. This could lead to all sorts of adventures and challenges as they try to keep the alliance together and achieve their common goals. For example, they might team up with the Gremory group to face a common enemy that threatens both of their interests.
Akeno can be a popular character as well. Her mysterious nature and powerful abilities make her an interesting character to interact with the SI. She might be part of the SI's adventures, either as an ally or an unexpected challenge.
One common theme is family loyalty. Since the Sitri family is an important part of the Highschool DxD universe, many fanfictions explore the bonds and loyalty within the family. For example, a Sitri character might go to great lengths to protect their family's honor or secrets.
One great Highschool DxD OC Sitri fanfiction is 'The Sitri's New Ally'. It has an interesting plot where the OC, a Sitri, forms unexpected alliances within the school's supernatural hierarchy. The character development is well - done, and it keeps you engaged throughout.
One great Highschool DxD Sitri fanfiction is 'The Sitri's Ascent'. It delves into the unique powers and family dynamics of the Sitri clan within the Highschool DxD universe. The story follows a young Sitri character as they navigate the challenges of the school and the supernatural world. It has an engaging plot with well - developed characters.
Rias Gremory would be a popular choice. She's a strong and important character in the Highschool DxD world. Her leadership and power could be a great contrast or complement to the SI's gamer - like abilities. Another could be Akeno Himejima. Her mysterious nature and powerful attacks could create interesting interactions with the SI. The SI could help her unlock new abilities using their gamer knowledge.
Highschool DxD OC Sitri fanfiction is unique because it gives a chance to expand on the Sitri lore. In these fanfictions, we can see how an OC Sitri might interact with other characters like the Gremory or the Phoenix clan. The stories can also explore the Sitri's magical abilities in more detail, such as their use of magic circles and spells specific to their clan.
Great Red is also a very popular dragon in Highschool DxD fanfiction. Given his mysterious and powerful nature, many fanfictions explore his potential influence on the main characters' lives and the overall plot of the story. His abilities are often expanded upon in these fan - created works.
Another popular one is Shirone. Fanfiction often focuses on her journey, her unique abilities as a nekoshou, and how she interacts with the main characters. She has a certain charm that draws readers in, and her story can be developed in many different ways, such as her adapting to the high school life and dealing with her nekoshou identity.