She could be very shy and reserved, in contrast to Harry's more adventurous nature. Maybe she spends most of her time in the library, reading about the history of magic and avoiding the spotlight that Harry often finds himself in.
Well, one possible plot is that the younger sister is a target of the dark forces because of her relation to Harry. She has to constantly prove herself and fight against the stigma. She could form a secret club within Hogwarts to train students in self - defense against the dark arts in a more creative way than what Umbridge allowed. And she might also have a magical pet that is not common, like a miniature phoenix.
Yes, there are quite a few. Some explore how a sister would change the dynamic of Harry's family and his adventures at Hogwarts. For example, she might be an additional source of support for Harry or have her own unique magical abilities that come into play during the fight against Voldemort.
Well, often the sister is used to explore family relationships more deeply. Maybe she has memories of their parents that Harry doesn't, which helps him understand his family history better. Also, a lot of these fanfictions have the sister being sorted into Gryffindor like Harry, and they become a duo that everyone at Hogwarts looks up to. They face challenges together, like dealing with bullies or difficult professors, and their bond grows stronger through these experiences.
Was it 'The Sister Dressed As The Female Lead Of A Sadistic Write'? This novel was an ancient romance novel. It told the story of the female protagonist, Jiang Shuyao, who transmigrated into the novel and became the female protagonist's sister. She worked hard to protect the female protagonist and resolved all the bad luck that the female protagonist encountered in the original novel. I hope you like this fairy's recommendation. Muah ~😗
One common theme is family. Since she is Harry's sister, stories often explore their family dynamic. It could be about how they support each other in the face of the challenges in the wizarding world. Another theme is identity. She has to figure out who she is apart from being Harry Potter's sister.
In certain versions of such fanfictions, the big sister could be a part of some secret plan against Voldemort that Harry is initially unaware of. She might be training in some ancient magic that later helps Harry in his fight. For example, she could be learning about a powerful spell that can break through Voldemort's defenses.
The following are some recommendations from ancient novels where the main character had a younger sister:
1. "Brother Above" by Cheng Seventeen. This novel told the story of the female protagonist as the male protagonist's stepsister. The two gradually developed feelings for each other in the process of getting along with each other as a family.
2. " My Sister is the Best in the World ": This novel tells the story of the main character, Chen Changqing, abusing the male lead for his sister.
3. " Peerless Emperor's Favorite: The Unparalleled Mute Queen ": This novel tells the story of the female lead, Ruan Enjing, and the male lead, Meng Jingyan. The female lead has a younger sister.
Please note that the novels recommended above may not completely meet your needs, but they are all works of the main characters in ancient novels who have sisters.
In some fanfictions, it could be through powerful magic spells that he discovers or is taught. Maybe he stumbles upon an ancient spell in the restricted section of the library that allows him to summon a family member. Another possibility is that he unknowingly activates some kind of magical artifact that has the power to bring a sister into his life.