She could be a half - blood like Harry. Maybe her mother was a muggle - born witch and her father was a pure - blood wizard. This mixed heritage could give her a unique perspective on the wizarding world's issues regarding blood purity.
She could be involved in the Akatsuki plot in some way. In the fanfiction, she might have been sent on a mission that led her to cross paths with the Akatsuki members. This could create a whole new storyline where Naruto has to rescue his sister from the clutches of the Akatsuki, adding more depth to the Naruto universe.
Maybe an original character could be created. This sister could be a powerful and wise ninja who has been traveling the world. She comes back to the village just in time to take Naruto under her wing. She could have a special kekkei genkai that she helps Naruto understand and perhaps develop in himself.
Sure, there are such fanfictions. When it comes to these types of fan - made stories, they can vary greatly in quality and plot. Some may be well - written with in - depth character development for the OC sister. They might show how she could have influenced Gaara's life growing up, or how she copes with the challenges in the ninja world as a relative of such an important character. It's all about exploring new possibilities within the Naruto universe.
One possible scenario in this fanfiction could be that Harry, with his magical abilities, enters the Naruto universe and is reborn as Naruto's older sister. He could use his magic in unique ways within the ninja world, perhaps using spells to enhance his ninja skills or to protect Naruto from early on. This would bring a whole new dynamic to the Naruto story as the presence of someone with such different powers and a different upbringing would change the way Naruto grows and faces challenges.
In the fanfiction, Hermione and her older sister could have a complex relationship. Maybe the sister is overprotective, constantly looking out for Hermione at Hogwarts, especially with all the dangerous situations she gets into. The sister could also be a bit jealous of Hermione's academic success and magical abilities, which could lead to some sibling rivalry.
The older brother in the fanfiction might be a character with a tragic past. For example, he could have been experimented on by Orochimaru and gained some strange powers as a result. And he returns to the village later to protect Naruto from the threats that are coming towards him.
Protection is a common theme. The older sister often tries to protect Naruto from harm. Another theme is growth, where Naruto's development is influenced by his relationship with the sister. Also, family bonds are emphasized, even if it's not a traditional family setup.
Some Naruto older sister fanfiction focuses on the relationship between Naruto and his sister in the context of the overall Naruto universe story arcs. Maybe she has connections to other important clans or characters. Her presence could potentially change the course of events, like how Naruto interacts with Sasuke or how he approaches his goal of becoming Hokage.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a wide range of fan - created stories, including Naruto - related ones. Just use the search function and type in 'Naruto older sister' to find relevant fanfictions.