One idea could be that the eight little hellions discover a magical portal and end up in a parallel world where everything is opposite. They have to figure out how to get back home while also dealing with the strange new rules and characters in this world.
It could be an old, grumpy neighbor who is constantly annoyed by the eight little hellions' antics. He tries to get them in trouble at every turn and devises all sorts of plans to make their lives miserable.
One idea could be exploring an alternate ending where Jo actually marries Laurie. It would change the whole dynamic of the story and show a different side of their relationship.
One idea could be to explore what would happen if Sara Crewe had a secret magical ability that she discovered while in the attic. For example, she could be able to communicate with the mice in a more profound way and they help her find a hidden treasure in the old house.
Another plot could be about the mermaid learning more about the human world in a different way. Instead of just falling in love with the prince, she discovers a hidden talent among humans like music or art and tries to bring it back to the underwater world. This could create a whole new set of adventures and challenges for her. For example, she might have to find a way to communicate with a human artist without revealing her true identity at first.
Maybe in the little Avengers fanfiction, they go on a quest to find a special artifact that can only be accessed by those of small stature. Along the way, they face challenges like tiny traps and miniature monsters. Each of the little Avengers, such as a young Spider - Man, could use their unique abilities to overcome these obstacles. They could also have a mentor, like a shrunken version of Iron Man, guiding them through their adventure.
One idea could be that the little merman discovers a hidden underwater kingdom full of magic and mystery. He could be on a quest to find a powerful artifact that can save his own kingdom from a dark force. Another plot could be a love story where he falls in love with a human who can also breathe underwater due to a special spell.
One idea could be exploring the vampire's family history more in - depth. Maybe there are ancient secrets or rivalries within the vampire clan that the main characters could uncover.
One idea could be exploring what would happen if Ariel had a secret power she didn't know about until after she became human. For example, she could have the ability to communicate with all sea creatures, not just the ones she already knew. This would create new challenges and relationships on land.
One idea could be exploring the backstory of the Thin Man. Maybe he was once a normal child in the world of Little Nightmares but something happened to turn him into that terrifying figure.
One idea could be a little one in a magical world where they discover they have special powers. For example, they can communicate with animals and go on adventures with their new furry friends to save the enchanted forest from an evil sorcerer.