You could focus on a side character's backstory in the 'Shippuu Konoha Gakuen Den' fan fiction. Maybe there's a character who seems mysterious, and by delving into their past, you can add depth to the story. Also, a tournament - style plot where different students compete in various challenges can be exciting.
An interesting concept could be to introduce a new power or ability that affects the whole Konoha Gakuen. This new element can create conflicts and new alliances among the characters. You can also play with the idea of different dimensions and how the characters from 'Shippuu Konoha Gakuen Den' interact with those from other dimensions.
First, familiarize yourself with the original 'Shippuu Konoha Gakuen Den'. Know the characters, their personalities, and the overall setting. Then, come up with a basic idea, like a plot or a character arc. It could be as simple as a day in the life of a student at the Konoha Gakuen.
One idea could be a story about a new student arriving at Equestria Gakuen. This new character could be from a different part of Equestria and have to adjust to the unique culture and classes at the school. For example, if they're from a more rural area and come to a school in a big city in Equestria. Another idea is a fanfic centered around a school competition. Different groups of students form teams to compete in various magical and non - magical events, and there are lots of rivalries and friendships formed along the way.
One idea could be creating an OC who is a transfer student with a mysterious past related to the babysitting club. For example, the OC's family might have a connection to the school that is slowly revealed. Another idea is an OC with a unique talent, like being able to communicate with animals, which could add an interesting dynamic to the babysitting situations. A third idea could be an OC who has a different cultural background and introduces new games and traditions to the kids in the club.
One idea could be exploring a mystery within the school that involves a long - lost secret society. Maybe the tanteidan discovers ancient artifacts hidden in the school grounds that have some sort of magical or historical significance.
Your OC could be a transfer student from a far - off place with a different understanding of Alices. They might struggle to fit in at first but then use their unique perspective to solve a big problem at the school. For example, if there's a conflict between different groups of students with different Alices, the OC could find a way to bring them together through their outsider view.
One idea could be an OC who has a special talent for music and uses it to soothe the children at the babysitting club. For example, when the kids are having a hard time going to sleep, the OC plays a soft lullaby on their guitar.
Well, you could write a fan fic where the relationships between the characters are reversed. So if in the original there are certain rivalries, in the fan fic they become allies and vice versa. Also, a story about a character who loses their power but discovers a new way to be strong within the 'unordinary' world would be interesting. Or how about a fan fic that takes place in a parallel dimension within the 'unordinary' universe where the rules of powers are slightly different?
Some interesting ideas for Riverdale fan fiction could be a crossover with another popular teen drama. Imagine the characters of Riverdale meeting the characters from 'Stranger Things'. It would be really cool to see how they interact. You could also write a fan fiction that focuses on the future of Riverdale. What will happen to the town and its residents ten years from now? Will Archie still be in town? How will Veronica's business empire develop?
You could write a fan fiction about a Pokemon trainer who has the unique ability to communicate with Pokemon on a deeper level than others. This trainer goes on a journey to solve the mystery of why some Pokemon are becoming more aggressive. Along the way, they meet different Pokemon species and form strong bonds with them. They might discover that there is an unseen force affecting the Pokemon's behavior, like a new type of pollution or an ancient curse.
One idea could be to write a fan fiction where Bluey and her family go on an adventure to a magical land. They could meet new characters and have to solve puzzles to get back home.