One common theme is self - discovery. Since Naruto is a female in these fanfics, she often has to figure out who she is in this new context of high school. Another theme is friendship. Just like in the original Naruto series, the importance of making friends and having a support system is emphasized.
One popular fem Naruto highschool fanfic is 'Fem Naruto's High School Adventure'. It's a really interesting read as it shows Naruto as a female character navigating the challenges of high school, like making friends and dealing with bullies, all while having her unique ninja skills.
In a fanfic, Fem Naruto could be a part of a secret organization in the Highschool DxD world. This organization could be focused on maintaining the balance between the different supernatural forces. She would bring her ninja training and knowledge, which includes things like espionage, combat tactics, and survival skills. Her presence would disrupt the status quo and lead to new alliances and rivalries as different characters react to her unique abilities and approach to problems.
One interesting storyline could be Fem Naruto joining the Occult Research Club in the Highschool DxD universe. She could use her ninja skills, like her shadow clone jutsu, in unique ways during club activities or battles against devils and fallen angels. Another could be her forming an unexpected friendship with Issei, perhaps teaching him some ninja stealth techniques which come in handy during his escapades.
In these fanfictions, a frequent theme is adaptation. A female Naruto has to adapt to the very different world of High School DxD, which has its own rules about devils, angels, and other supernatural beings. Also, the theme of identity can be important. As she tries to fit in, she might question who she is in this new context. There may also be themes related to love and romance as she meets new and interesting characters.
Their relationship could start off rocky, with Naruto being his boisterous self and fem Sasuke being aloof. But as they interact more in classes, study groups, or school events, they might start to understand each other better. Naruto's positive attitude could gradually break down fem Sasuke's walls.
One idea could be a story where the OC is a new student at the school and catches Fem Vali's attention during a battle training session. Their relationship could start as a rivalry but gradually turn into a deep friendship and then something more romantic as they discover they have more in common than they thought.
In developing their characters in the fem Naruto x Sasuke highschool fanfiction, start with their appearances. Fem Naruto could have long blond hair tied in a ponytail and bright blue eyes. Sasuke could have his signature dark hair and brooding look. Then, for their personalities, fem Naruto can be energetic and enthusiastic about school activities like sports day or the school play. Sasuke can be more reserved but extremely talented in academics or a particular subject like martial arts. As the story unfolds, their interactions should cause them to grow and change. For instance, fem Naruto's optimism might start to make Sasuke more open to new experiences and relationships.
She might be a mediator between different factions. Since she has experience dealing with different groups in the Naruto world, she could try to bring peace between the devils, angels, and other races in the DxD world. Also, her unique sense of justice could influence the characters in DxD to be more morally upright.
Well, in a fem Naruto in Highschool DxD fanfiction, it could be really interesting. Maybe fem Naruto would bring her ninja skills to the DxD world. She might befriend Issei and the others. Her chakra could be seen as a unique power in the DxD universe, and she could use her jutsu to fight against the devils and fallen angels. She could also learn about the Rating Games and use her strategic mind from being a ninja to compete in them.