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.
One common plotline could be the girl facing emotional hurt from past traumas that are explored within the magical setting of Neverland. Maybe she was betrayed by someone she trusted in Neverland, like a lost boy who turned against her.
In some cases, it could be a corrupted lost boy. Maybe one of the lost boys has turned bad due to jealousy or a desire for power. He sees the hurt girl as an easy target to assert his dominance or to gain something from her, like her friendship with Peter Pan. So he becomes the main source of trouble for the girl in the fanfiction.
One underrated character is Felix. He's always by Peter Pan's side, but we don't really know much about his past or his motives. Fanfiction could explore his backstory, like maybe he was a lost boy who had a really tough life before coming to Neverland and that's why he's so loyal to Pan. Another could be the mermaids. They are often just seen as minor characters, but they could have their own complex society and relationships that could be delved into in fanfiction.
One plot idea could be that Captain Hook and Emma Swan find themselves in a race against time in Neverland. They have to retrieve a magical artifact before a dark force uses it to destroy all the realms. Along the way, they face challenges from the Lost Boys and some of Hook's old enemies.
One popular 'Once a upon a time story' is 'Cinderella'. It's about a kind - hearted girl who is mistreated by her stepmother and stepsisters but eventually finds true love with the help of her fairy godmother. Another is 'Snow White', a beautiful princess who has to flee from her evil stepmother and finds refuge with the seven dwarfs. And 'Sleeping Beauty' is also well - known, where a princess is put into a deep sleep by a curse and is awakened by a prince's kiss.
Well, they could start by relying on each other's skills. Hook's knowledge of Neverland and his sailing expertise, combined with Emma's magic, would make them a formidable team. As they face danger together, like escaping from a giant sea creature or finding a way through a maze in the jungle, they start to trust each other more, which deepens their relationship.
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.
Once upon a time, a family bought a new house. In the basement, there was a locked door. One night, the youngest son heard strange sounds coming from behind that door. He found the key and opened it. Inside, there was a dark room filled with old portraits. As he looked at them, the eyes in the portraits seemed to follow him. He quickly closed the door but could still hear the voices from the room.
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.