One plot idea could be a story where the lost girl discovers a hidden realm within the Fae world that holds the key to a long - forgotten power. Another could be a love story between the lost girl and a character who is initially her enemy but then they realize they have a deeper connection. Or perhaps a plot where she has to team up with a group of unlikely allies to defeat a new and powerful threat to the Fae and human worlds.
One plot idea could be that a lost girl in Neverland discovers she has a special power that can break the eternal youth spell on Peter Pan. Another could be a lost girl forming an alliance with the mermaids to find a way back home against Peter Pan's wishes. And a third could be a lost girl trying to rewrite the rules of Neverland to make it a more equal place for all the lost children.
One idea could be a crossover where characters from 'half upon a time' meet characters from another well - known fairy - tale world. This could lead to some really unique and humorous interactions as they try to navigate each other's rules and cultures.
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 idea could be a new agent arriving at Warehouse 13 with a mysterious past that turns out to be linked to an artifact that was thought to be lost forever. This new agent might unknowingly hold the key to controlling the artifact's power, causing a stir among the existing agents as they try to figure out how to handle the situation.
A love - interest plot for Gideon would also be interesting. He could fall in love with a character from a different realm within the Once Upon a Time universe. Their relationship would be complicated by the different rules and cultures of their respective realms. They would have to overcome many obstacles, like disapproving family members or the threat of war between their two realms.
One idea could be to create a story where a new character, an aspiring actress, befriends Rick Dalton and Cliff Booth. She gets involved in their crazy Hollywood adventures and helps Rick revive his career in an unexpected way, like by introducing him to a new type of movie role that suits his acting style better.
One idea could be exploring Gothel's backstory before she became the villain we know. Maybe she had a tragic love in her youth that turned her bitter. Another plot could involve Gothel teaming up with an unexpected character from the Once Upon a Time universe, like a hero who thinks they can reform her. A third option is to create a story where Gothel has a daughter of her own and we see how she raises her in contrast to how she treated Rapunzel.
Another interesting plot could be Loki falling in love with a character from Once Upon a Time. Maybe he has a relationship with a princess or a powerful sorceress, and their love story is filled with magic, drama, and challenges as they come from different worlds.
A great plot for Frozen fanfiction could be a time - travel story. For example, Elsa is sent back in time to when her parents were young. She has to figure out how to get back to her own time while also trying not to change the past too much. But she might also learn some secrets about her family's past and her own powers. Another could be a story about a competition in Arendelle. Anna decides to hold a magical - themed competition, and people from all over come to show off their skills. Elsa has to judge, and in the process, she meets someone who seems to have powers similar to hers but uses them for evil. Anna, Elsa and Kristoff then have to stop this person.
One plot idea could be that Hook and Wendy team up to find a magical artifact that can save Neverland from a dark curse. Along the way, they face many challenges and start to develop a deeper understanding and respect for each other.