Many fanfictions have a plotline where the sister's power is initially seen as a threat by the wizarding community. They might fear that she could be as dangerous as Voldemort if her powers are not controlled. So, she has to prove herself, not only to Harry and his friends but also to the entire wizarding world that she will use her powers for good. This often leads to a lot of internal struggle and external challenges as she tries to gain acceptance.
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.
A more complex plotline could involve the sister being targeted by Voldemort because he sees her as a threat to his plans. She might have a prophecy associated with her that predicts she will be the one to finally defeat him. This would put her in a lot of danger and force Harry to be even more protective of her while also relying on her unique skills to fight against the Dark Lord.
In some fanfictions, Harry's sister might be sorted into a different house than him, like Slytherin. This would create a lot of internal conflict within the family as well as at Hogwarts. It could lead to a situation where Harry has to defend his sister against the prejudices of his friends. Or perhaps she has a prophecy related to her that ties into Harry's own destiny, and they have to figure out how to fulfill both prophecies without sacrificing one another.
One interesting plotline could be the twin sister having a unique magical ability that Harry doesn't. For example, she might be able to communicate with magical creatures in a way no one else can. This could lead to her getting involved in adventures that are separate from Harry's at Hogwarts, but still end up being connected in some way, like when she discovers a secret about a creature that is related to a dark wizard who is also after Harry.
Another plotline could be that the powerful heir is initially hidden among the normal students at Hogwarts. As they gradually discover their powers, they form unexpected alliances. For example, they might team up with some of the less popular characters in the original series. Their power could also be something that is not just magical but also has an impact on the political structure of the wizarding world, like being able to change laws or traditions with their sheer might, which would surely stir up a lot of drama.
One possible amazing plotline could be a story where Harry discovers an ancient magic that makes him all - powerful and he uses it to bring back all the fallen characters. He could then reshape the wizarding world into a more inclusive and harmonious place.
One common plotline is a character getting lost in the forest and having to find their way out while facing various challenges. Another is that the forest is the location of a hidden magical object or power source that characters are searching for. Also, sometimes there are battles or confrontations in the forest between different groups in the fanfiction world.
A lot of fanfiction involves elves forming alliances. They might team up with Hogwarts students or other magical beings. For example, an elf could form a bond with a young wizard and help them discover a long - lost magic. Sometimes, there are also plotlines about elves reclaiming their lost heritage or magic that was taken from them in the past.
One common plotline is Harry's journey to become an outstanding Chaser. It might involve him facing challenges from other players, like rivalries within the team. Another plotline could be how his skills as a Chaser help Gryffindor win important matches and championships.
Often, you'll see plotlines where Snape's desires are tied to his need for redemption. He may see Harry as a way to atone for his past mistakes. Some fanfictions also explore a more emotional connection between them, like Snape becoming a father - figure to Harry in a way. This can involve Snape teaching Harry more about the wizarding world from his own unique perspective. There are also plotlines where Snape and Harry work together to uncover secrets about Harry's past or Hogwarts itself.