One interesting crossover could be Naruto characters in the Once Upon a Time world facing magic they've never encountered before. For example, Naruto might be intrigued by the dark magic in Storybrooke. He could use his own chakra powers in unique ways to combat it or understand it better. Another idea is having characters from Once Upon a Time learn ninja techniques from Naruto. This would change the power dynamics in their own fairy - tale world and create new storylines.
Some crossovers could involve the concept of 'jinchuriki' from Naruto in the Once Upon a Time universe. Imagine if a character in Once Upon a Time became a host for a powerful spirit or magic, similar to how Naruto is a host for the Nine - Tailed Fox. This could lead to a whole new set of character developments and story arcs as they struggle to control or come to terms with this new power.
A cool crossover would be to see how the Nine - Tailed Fox in Naruto compares to the powerful magic creatures in Once Upon a Time. Maybe the Nine - Tailed Fox could be mistaken for a powerful dark entity in the Once Upon a Time realm. And characters like Sasuke could interact with the sword - wielding heroes of Once Upon a Time, exchanging combat skills and knowledge.
One interesting crossover could be Hermione finding herself in the Once Upon a Time world. She might use her magic skills to solve the strange problems there. For example, she could help the characters break a particularly difficult curse using her vast knowledge of spells. Another could be her interacting with the fairy - tale characters like Snow White or Cinderella. She could teach them about the more advanced forms of magic she knows from the wizarding world.
Well, a really cool crossover idea is to combine the powers of Scarlet Witch with the magic in 'Once upon a time'. Scarlet Witch's reality - warping powers could be seen as a form of powerful magic in a fairytale world. She could accidentally open portals to fairytale lands and the Avengers have to deal with the consequences. Also, Thor could be seen as a god - like figure in a fairytale world, similar to some of the all - powerful beings in 'Once upon a time'. His hammer could have even more magical properties in this crossover, and he might have to prove himself worthy in a different way, like by solving a riddle in a fairytale - like trial.
Well, there could be a crossover where the Dark One from Once Upon a Time is interested in Elsa's powers. He might try to manipulate her into using her ice magic for his own dark purposes. Anna, on the other hand, would do everything she could to stop him, with the help of some of the heroes from Once Upon a Time like Henry. This would create a really exciting story full of magic, adventure and a battle between good and evil.
Yes, there can be some really cool crossovers. For example, the characters from Descendants could be inserted into the magical world of Once Upon a Time. Mal could meet Snow White and have an interesting interaction. Maybe she'd try to use her magic in the different magical rules of the Once Upon a Time universe.
One interesting crossover could be Percy Jackson finding himself in the Enchanted Forest from Once Upon a Time. He might use his demigod powers to help the fairy - tale characters deal with threats they've never faced before, like sea monsters invading their land. His water - based powers would be especially useful near the shores of the Enchanted Forest. Another crossover could be some of the Once Upon a Time characters traveling to Camp Half - Blood. For example, Snow White could learn self - defense skills from the demigods there. And the demigods could be fascinated by the magic that the Once Upon a Time characters possess, which is different from their own god - given powers.
One idea could be exploring the backstories of the lost boys in more detail. Maybe one of them has a hidden connection to a character from the outside world. Another plot could involve a new villain coming to Neverland who has a different kind of magic that challenges Peter Pan. Also, a story about Wendy's granddaughter returning to Neverland to find a lost family heirloom could be interesting.
A 'found family' trope is quite common. Characters who were alone or estranged in the show form a close - knit family in fanfiction. For instance, Henry might bring together different characters who then become his new family. Also, the 'hurt/comfort' trope, where a character is hurt (physically or emotionally) and another character comforts them, is frequently used in Once upon a Time fanfics.
Family relationships are a big theme. Some fanfics focus on the family dynamics between characters like the Charmings and their descendants. There are also fanfictions that revolve around the theme of identity. Characters in 'Once upon a time' often have complex identities, and fan writers like to dig deeper into how these identities are formed and how they can change over time.
A prevalent trope is the 'reincarnation' trope. Fans might write about how the characters are reincarnated in different time periods or worlds and how their relationships are rekindled. 'Power - swapping' is another interesting one, where characters exchange their powers and how that affects their relationships and the story. There are also 'secret relationship' tropes, especially for characters who had a lot of chemistry on the show but never got together officially, like Belle and Will Scarlet. Writers create scenarios where they have a secret relationship and all the drama that comes with it.
Another well - known 'once upon a time story' is 'Little Red Riding Hood'. A young girl was on her way to visit her grandmother when she encountered a big bad wolf. This story is often used to teach children about the dangers of talking to strangers.