In this 'Stiles is secretly a girl fanfiction', perhaps Stiles is a girl in disguise because she is trying to escape from some sort of danger in her true identity. So she pretends to be a boy named Stiles. As the story unfolds, she might form deep friendships with the other characters and struggle with when and how to reveal her true self.
Well, it could be that Stiles is secretly a girl and in the fanfiction, this secret is slowly revealed as he falls in love with someone. And the person he loves starts to notice little things that don't quite add up with his supposed male identity, like his more delicate features or his different style of communication.
His best friend could discover it. Since they are so close, they might notice something different about Stiles that makes them suspect he's actually a girl.
One possible plot twist could be that Stiles has been a werewolf all along but has been using some sort of magic or potion to suppress his werewolf side. This could be revealed when he is put in a life - or - death situation and his true nature emerges to save the day.
Well, it could be that Stiles' secret vampire fanfiction is actually a premonition. He starts writing about a particular vampire who then shows up in real life. But this vampire is different from the typical ones in the stories. Instead of being evil, it's trying to find a way to co - exist with humans. Stiles then has to use his knowledge from the fanfiction to help this vampire, all while still keeping his vampire - loving side a secret from his friends.
Well, it could be that Gray has been hiding her true female identity all along. Maybe she's in a world where being a girl is not accepted in a certain context, like in a male - dominated sport or a strict military - like organization. And the fanfiction could revolve around her struggles to keep her secret while also trying to fit in and pursue her dreams.
Well, perhaps the plot could revolve around Percy hiding her true identity as a girl in a world where she's expected to be male. Maybe she's in a situation like a boarding school or a fantasy adventure setting, and she has to constantly keep up the facade while also dealing with her own self - discovery and the challenges that come with it.
Well, one possible plot twist could be that Natsu has been hiding her true gender to be able to participate in male - dominated activities like a certain guild or sport. Another could be that she's in love with a male character, but is afraid to reveal her gender in case it changes how he feels. Or perhaps she has a special power that is related to her being a girl secretly, like a unique form of magic that only female dragonslayers can possess.
Perhaps in this fanfiction, Bilbo is secretly a girl who has a great love for adventure but is restricted by the gender norms of her world. She disguises herself as a boy to join the dwarves on their journey. Along the way, she could fall in love with one of the characters, and her secret might be in danger of being exposed when they start to have more intimate moments. Her internal struggle between her true self and the false identity she has created could be a central part of the story.
One possible plot twist could be that Zoro's gender is revealed at a crucial moment, causing shock among the other characters. For example, during a battle when an enemy discovers this secret and uses it to try and throw the team off balance.
A plotline might be that Stiles got secretly married while on a trip away from his friends. When he returns, he has to figure out how to integrate his new married life into his old friendships. There could be comical moments like trying to hide his wedding ring or coming up with excuses for why he can't hang out at certain times. Also, the relationship within the marriage could be explored. Is it a marriage of convenience that slowly turns into love? Or was it a passionate love - at - first - sight kind of marriage that they now have to deal with in secret.
Maybe Ichigo is secretly a girl because she's on a secret mission. In the fanfiction, she could be a spy or an undercover agent. Her guise as a boy has allowed her to infiltrate certain groups or places. When her true identity as a girl is discovered, it throws the whole mission into chaos, and she has to find a way to salvage it while dealing with the personal relationships that are affected.