One possible fanfiction could be about Rias and Sona teaming up for a school event. They might put aside their usual competitiveness and work together to organize a devil - related festival at the school. They could combine their unique skills and powers to create an amazing event that not only impresses the other students but also strengthens their bond as friends.
Power - up themes are also common. Naruto already has his powerful ninja abilities, and when combined with the magic and power systems in High School DxD, there are often scenarios where he or Sona gain new powers or find new ways to use their existing ones. For example, Naruto might learn to combine his chakra with Sona's magic for a super - attack. Another theme is friendship and alliance. Since they are from different worlds, they need to form an alliance to face common enemies. This often leads to the development of a deep friendship between them as they rely on each other's strengths.
One way is to explore her family background more. For example, showing how her upbringing in the devil society influenced her leadership style in the student council.
One popular 'naruto x sona highschool dxd fanfiction' might be 'Naruto in the World of High School DxD'. It often explores how Naruto's abilities and personality would interact with the unique world of High School DxD. The story usually has some interesting crossovers like Naruto using his jutsu in the battles against the devils and fallen angels in the DxD setting.
A fanfiction could show how Rias and Sona first became friends. Maybe it was during a difficult time at school when they both had to face some sort of discrimination from other devils because of their different leadership styles. They found comfort in each other and decided to support one another from that moment on.
In this fanfic, Naruto could bring his sense of justice to Sona's side. Since Naruto is always about protecting his friends and doing what's right, he could inspire Sona and her followers. His chakra could be an interesting element in the world of devils and angels. He might even find a way to use his chakra to enhance the abilities of Sona's peerage members.
At first, Naruto might be a bit confused by Sona's world, but his natural curiosity would drive him to learn more. He would ask her a lot of questions, and Sona would find his naivete endearing yet also frustrating at times. As they spend more time together, Naruto would start to understand Sona's motives better and would do his best to support her. He might even start to develop a special bond with her, like a really good friendship or something more, depending on how the fanfic develops.
A third plot idea might be Sona trying to modernize the traditions of the devil world within the context of the school. She could face opposition from more conservative devils, and the story could explore her struggle to bring about change while still maintaining her position and respect.
Perhaps Alex Black has a mysterious past that Sona is intrigued by. They could start off as acquaintances, but as time goes on, they form a deeper bond over shared interests in magic and the supernatural world of Highschool DxD.
Friendship is a common theme. Tsubaki and Sona often start with a pre - existing friendship in the fanfictions and it either deepens or is tested. For example, they might have to support each other through tough times at school or in the supernatural world.