One common theme is the clash and fusion of the two different worlds. Harry's magical world and Naruto's ninja world collide, and it's interesting to see how they interact. Another theme is family. Since she's Naruto's sister, stories often explore their family bond, how she protects him and helps him grow.
Yes, there are. I've come across some really interesting ones. In some of these fanfictions, fem Harry brings her unique Hogwarts - trained skills and knowledge into the Naruto universe. For example, she might use her potion - making skills to create something similar to the ninja's medical jutsu ingredients. It's really fascinating to see how the two different fictional universes are blended together in these stories.
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.
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.
Her character might start off a bit confused. Being in a new world as Naruto's sister, she has to adapt. She could develop a strong sense of loyalty to the Hidden Leaf village like Naruto. And as she grows, she might become more confident in using her magic in this new environment. Maybe she starts off being a bit shy about it but then realizes it can be a great asset.
The plot could involve fem Harry trying to keep her identity as Naruto's sister a secret in the wizarding world. She could be on a journey to find out more about her family connection to Naruto. Along the way, she might face challenges from both the magical and ninja communities. She could also meet characters from both universes and have to navigate their different cultures and expectations.
There could be various storylines involving Heather as an older sister in Harry Potter fanfiction. Maybe she's a Gryffindor like Harry and helps him out in his adventures, or she could be a Slytherin with her own complex motives.
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.
Typically, these fanfictions often focus on the unique dynamic between an older Naruto and a female Itachi. There's usually a strong emphasis on their relationship development, whether it be a friendship or something more romantic. For example, in many such stories, Naruto's maturity as an older character plays a big role in how he approaches the female Itachi.
There's also 'The Unseen Bond'. In this fanfiction, the female Itachi has a complex personality. The author does a great job of depicting how Naruto, now older, interacts with her. It shows their growth and how they support each other through various difficult situations in the story.