Ron and Hermione are likely to interact with them. Ron might be a bit more protective of the sister, while Hermione would probably study and share knowledge with her. They could all be in the Gryffindor common room, discussing spells and strategies.
Severus Snape is often a prominent character in these fanfictions. His complex relationship with the Potter family could be explored further. He might have a different attitude towards the twin sister, perhaps seeing in her some qualities that remind him of Lily Potter. This could lead to some interesting interactions and plot developments, like him secretly protecting her or teaching her some advanced potions techniques. Dumbledore is also popular. His all - knowing and guiding role can be enhanced in the fanfiction, as he might have special plans for the twin sister in the fight against Voldemort.
A really interesting one is 'A Twin's Tale'. In this fanfic, the twin sister has her own unique powers and personality. It's fascinating to see how she interacts with the other characters like Hermione and Ron. The story also explores how her presence changes the events in Hogwarts and in the fight against Voldemort. It's a must - read for any Harry Potter fanfiction lover.
Another important character that is often involved is Hagrid. He might be the one who stumbles upon the forgotten twin sister in her hiding place or he could be the one to introduce her to the wizarding world properly. Then there are the Weasley family members. They could play different roles, like Ginny might become the twin sister's best friend or Fred and George could include her in their pranks and adventures, adding some light - heartedness to the story.
Well, obviously Harry Potter is one of the main characters. His twin sister would be another main character. There might also be the usual suspects from the original series like Hermione and Ron, who would likely be involved in the story as friends and comrades to Harry and his sister. Dumbledore would probably also play an important role as he does in the original books, guiding and protecting the young wizards.
Luna Lovegood is also quite popular in these fanfictions. She and the twin sister could bond over their shared belief in things that others might find strange. They might go on adventures in the Forbidden Forest together, looking for the Crumple - Horned Snorkack. And of course, Ron is always a key character. He could be like a big brother to the twin sister, and they could have a lot of funny moments together, especially when it comes to food at Hogwarts.
One interesting plot could be the twin sister having a special 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 helping Harry in his adventures in a unique way, like getting help from a phoenix or a centaur when they are in a tough situation.
Perhaps she would have different magical abilities compared to Harry. While Harry is known for his connection to the Patronus charm and his ability to speak Parseltongue, she could be a natural at things like divination or arithmancy. This would make their dynamic interesting as they would each bring different skills to the table when facing the various threats in the wizarding world.
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.
One common theme is family. Since she's Harry's twin sister, the stories often explore their family connection and how it affects their lives in the wizarding world. Another theme is identity. The sister has to figure out who she is in relation to Harry and also as an individual witch. Magic is also a big theme, of course, like how her magic might be different or similar to Harry's.