Maybe a girl is the sole survivor of a different part of the plane crash. She has a different set of skills compared to the boys, like being really good at fishing. As she meets the boys, she tries to teach them her skills but faces resistance from some of the more power - hungry boys. This could lead to conflicts and also alliances within the group.
One idea could be a girl who is stranded on the island before the boys arrive. She has managed to create a small, hidden shelter and a basic system for survival. When the boys show up, she initially observes them from afar, trying to decide if she should reveal herself. Her presence could change the power dynamics and the way the boys interact with each other.
One idea could be to explore what would happen if there were girls on the island as well. It would change the dynamics completely. Maybe they would be more organized and less violent in their attempts to survive. Another idea is to write a fanfiction where the boys are rescued much earlier, but then have to deal with the trauma of their time on the island back in the civilized world. How would they adjust to normal life again?
Another idea is to set the fanfic in a modern - day version of the island. The boys could have access to some modern technology like a broken cell phone that they try to fix to call for help. This would add a new twist to the story as they deal with the same basic problems of survival but also with the allure and complications of technology.
Maybe the girl in the fanfiction is a very strong - willed character. She could find a hidden part of the island that has resources the boys don't know about. She uses this to her advantage to gain power among the group on the island. As she tries to establish order, she faces challenges from the boys who are used to their own chaotic ways.
Another plot idea could be a time - traveling adventure. What if the characters from 'the thief lord' were transported to a different era? They could face new challenges and learn different things about themselves and their relationships.
A plot could revolve around the main character forming an unexpected friendship with someone who has a completely different background. They could help each other heal and overcome their respective traumas. For instance, if she befriends an older person who has also faced hardships, they can share their stories and learn from one another.
One idea could be that Mosqito Girl discovers a new power within herself that allows her to communicate with other insects. She then uses this power to save her city from an evil villain who is using pesticides to harm all the bugs.
One idea could be that the girl discovers a wounded dragon and nurses it back to health. As the dragon recovers, they form an unbreakable bond and embark on adventures together, protecting the land from evil forces.
Maybe the new girl discovers an old diary in the loft that reveals some hidden secrets about the building's past. She then embarks on a journey with her roommates to uncover the mystery, which brings them closer together. For example, they might find out that there was a famous artist who once lived there and left behind some valuable artworks. The new girl could be the key to solving the clues in the diary.
One idea could be that the girl has a secret talent or hobby that the main character discovers and it becomes a big part of their relationship. For example, she might be an amazing painter but has been too shy to show her work. Another could be that they meet in an unexpected place like a small, out - of - the - way bookstore. And then they start talking about their favorite books and realize they have a lot in common.
Perhaps in this 'ponyboy as a girl' fanfiction, she has a special talent for art. She uses her art to express the pain and struggle of the Greasers' life. This catches the attention of a Soc girl who is also into art, and they start a secret friendship that slowly begins to change the views of both groups towards each other.