One idea could be a fanfiction about the characters' adventures in a school sports competition. For example, focusing on how the characters train hard, overcome difficulties together, and build friendships through the sports event. It can show their teamwork and determination.
A family - friendly fanfiction could be about the characters exploring a magical mystery in their school. Maybe there is a hidden room in the school that holds ancient secrets, and the characters work together to solve the mystery, learn about history and magic, without any inappropriate content.
One idea could be fanfiction about the Powerpuff Girls going on a new adventure in a different city, like saving a famous landmark from a new villain. Another could be them having to deal with a magical creature that has escaped from a hidden realm.
One type of good family - friendly fanfiction could be those that focus on Issei's school life. It might show him dealing with normal school problems like exams, making friends in a non - supernatural context, and his relationship with his teachers. This gives a more down - to - earth view of Issei.
Well, you could explore fanfiction that focuses on the friendships in 'Highschool DxD'. There are also ones that center around the battles and strategic planning within the story. Another option is to find fan - created stories that deal with the comical aspects of the series without any sexual content.
One idea could be to focus on the characters' relationships outside of the main plot. For example, how the students interact during normal school days, like study groups or after - school clubs. Another idea is to create an alternate universe where the rules of the dxd world are slightly different in the high school setting, which could lead to new adventures and challenges for the characters.
One idea could be that Naruto is somehow transported to the world of Highschool DxD. He could use his ninja skills and chakra in the new world, maybe even teach some of the characters there a thing or two about combat. For example, he could show Issei how to better control his power using chakra control techniques.
A third idea could be a fanfiction where Gaara becomes a devil himself. He could bring his ninja skills and his sand abilities into the devil society. This would change the power dynamics in the DxD highschool as he would be a very different type of devil compared to the existing ones, with his own moral code and way of doing things.
One idea could be to create an alternate universe where the main character has a different set of powers. For example, instead of the traditional Sacred Gear, they could have a power related to time manipulation. This would change the dynamics of battles and interactions with other characters.
A third idea could be a time - travel fanfiction. For example, a character from Highschool DxD travels back in time to the era of Bleach and meets Ichigo when he was still developing his powers. This could lead to some interesting interactions and changes in the timeline of both universes.
You could write about an OC who is a half - angel, half - devil. Their internal struggle between the two natures and how they fit into the world of Highschool Dxd, trying to find their place among the devils, angels and fallen angels. It could explore themes of identity and acceptance.
Another interesting concept is to set the fanfiction in an alternate universe. In this universe, the twins could be from a different race or have a different upbringing. This would allow for a fresh take on their characters and how they fit into the Highschool DxD world. For example, they could be raised in a human - devil hybrid society, which would give them a different perspective on the ongoing conflicts in the series.