One common theme is family loyalty. Despite the strange and often dangerous world of the Lost Boys, the bond between the star and his sister remains strong. Another theme is self - discovery. The sister often has to figure out who she is in this new and wild environment.
There's a fanfiction that focuses on the sister's unique abilities and how she uses them to protect her star brother. In this story, their bond is tested by various challenges in the Lost Boys' universe. It's a really engaging read as it explores their characters more deeply.
She could also have a different view of the world compared to the Lost Boys. Since she has a connection to the stars, she might see things from a more celestial perspective. This could lead to interesting conflicts and resolutions within the fanfiction. For example, she might think that certain actions the Lost Boys take are wrong according to the stars' 'code' or something similar.
In this type of fanfiction, the star sister might be an outcast like the Lost Boys. They could bond over their shared sense of not belonging. The story could explore how they come together and form a unique family. The Lost Boys might protect the star sister from those who want to use her powers for evil, and in return, she could use her star - related abilities to keep them safe from the sun or other threats.
One possibility could be that she shows up at Camp Half - Blood unexpectedly. Maybe she was raised by a mortal family all this time, not knowing about her demigod heritage. When she arrives, she has powers similar to Percy's but also some unique ones, like the ability to communicate with sea creatures in a different way than Percy. This could lead to all sorts of adventures and conflicts within the camp as everyone tries to figure out who she really is and what her role will be.
One possible fanfiction idea could be that Bella, as David's sister, has a conflicted relationship with the vampire gang. She might try to keep David from getting into too much trouble while also being drawn to their wild lifestyle. For example, she could be the voice of reason when they plan their hunts, but at the same time, she has her own vampire instincts that she struggles with.
Her character could develop in a way that is very much in contrast to Percy. While Percy is often impulsive, she could be more calculating. This difference causes some friction at first, but as they face challenges together, they learn from each other. For example, she might teach Percy to think before he acts in some situations, and Percy could show her how to be more spontaneous and trust her instincts. Over time, she becomes more well - rounded, balancing her cautious nature with a newfound sense of adventure.
First, give her a distinct personality. If Naruto is all about determination and Sasuke is brooding, she could be the calm and wise one. Then, give her a backstory. Maybe she was separated from Sasuke at a young age and grew up in a different part of the ninja world. This would shape her view of things. Another way is to show her relationships. For example, how she interacts with Naruto's friends like Sakura and Kakashi. This will help to flesh out her character more.