Maybe the fanfiction could revolve around James Charles' little sister getting involved in a mystery. A strange package arrives at their house addressed to her. Inside, there are some old makeup products that seem to have a magical quality. When she uses them, she can transform into different characters. James helps her figure out the origin of these products and they go on an adventure to return them to their rightful place, all while she has to keep her secret identity under wraps.
The plot could be that James Charles' little sister discovers a hidden talent for singing. She's too shy to tell anyone at first, but then she starts to secretly practice in an old barn on their family property. One day, James accidentally overhears her and is completely blown away. He encourages her to share her talent with the world. With James' support, she enters a local singing competition and wows the judges, starting her journey to becoming a singer.
One day, James Charles' little sister decided to follow in her brother's footsteps in the world of makeup. She started by borrowing his makeup brushes. With a determined look, she began to apply bright eyeshadow, just like she had seen James do countless times. But being younger, her hand wasn't as steady, and the result was a bit of a colorful mess. However, James saw her effort and instead of laughing, he gave her some tips on how to hold the brush properly and blend the colors better.
One possible plot could be that Kaite and James are part of a special squad in the Gears of War universe. They are sent on a dangerous mission to retrieve an important artifact. Along the way, they face hordes of Locusts and have to rely on each other's skills. Kaite might be the strategist, while James is the more combat - oriented one. Their relationship could start as just comrades but develop into a deep friendship as they face life - and - death situations together.
It could be about Tenten's sister's adventures in the ninja world. Maybe she discovers a new jutsu or goes on a mission with Tenten and their friends.
It could be about her growing up on Pandora and learning the ways of the Na'vi. Maybe she has a special connection with the nature there that no one else has.
One possible plot could be that Naruto's little sister is also a ninja in training. She might struggle with the same kind of ostracism Naruto faced because of the Nine - Tails inside him. However, she could also be a source of great support for Naruto, helping him through his toughest times and together they could train to become stronger. Maybe she has a unique ninja ability that even Naruto is in awe of.
One possible storyline could be that James Potter's little sister is a bit of an outcast in the wizarding world because she doesn't have the same brash and popular personality as James. Maybe she's more into books and research. She could struggle to find her place among the Gryffindors who idolize her brother. Another could be that she has a special power that she's afraid to show because she doesn't want to be compared to James all the time. And she might form an unlikely friendship with someone from a different house, like a Ravenclaw, who helps her explore her own identity away from her brother's shadow.
She could be a key to unlocking an ancient supernatural prophecy. The Winchester brothers might discover her existence and realize she holds the key to stopping a major apocalyptic event.
She could be a secret prodigy. Maybe she's been hiding her true magical abilities because she doesn't want to overshadow Neville. But then, in a time of great danger at Hogwarts, she reveals her skills to save the day.
Well, one possible plot could be that Thor and Loki's little sister has some special powers that are a mix of their own. She might be caught in the middle of their feuds, trying to bring peace between them. For example, she could use her powers to stop Loki from his mischievous plans that would anger Thor, while also making Thor understand Loki's motives better.
Another possibility is that the fanfiction is set in an alternate universe. In this universe, the little sister has some special powers related to the Duel Monsters world that no one else has. She uses these powers to help Jaden and his friends save the world from an evil force that wants to misuse the power of the Duel Monsters cards. This could involve a lot of action - filled duels and exciting adventures.