In some fanfictions, it could be an original character created by the author. Maybe a witch who was the result of an affair that his father had before he married his mother. However, this is completely against the canon of the original books, but in the world of fanfiction, anything is possible.
One common theme is family. Since it's about Harry's half - sister, exploring family dynamics is a big part. It often looks at how she fits into the Potter family, whether she's accepted or faces challenges. Another theme is identity. She has to figure out who she is in relation to Harry and the wizarding world in general.
One possible plotline could be that Harry's half - sister is initially on the side of the dark forces. She could be manipulated by Voldemort or his followers. Harry then has to try and save her and turn her to the good side. This would be a classic good - vs - evil struggle within the family.
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.
One great 'Harry Potter's half - sister fanfiction' is 'The Hidden Potter'. It explores the relationship between Harry and his newly discovered half - sister in a really interesting way. The characters are well - developed and it stays true to the magical world of Harry Potter.
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.
I'm not entirely sure if there is a specific 'Harry Potter is half demon' fanfiction, but considering the limitless creativity in the fanfiction community, it's very likely. Writers might be inspired to create such a story to explore the contrast between the magical world of Harry Potter and the more dark and otherworldly concept of being half - demon. They could use it to examine themes like acceptance, identity, and power in a whole new light.
The allure of 'Harry Potter' half - elf fanfiction lies in the mystery it can bring. Half - elves are not part of the original lore in a big way, so writers can be very creative. For example, they could create a half - elf character who has a secret power that helps Harry in his fight against Voldemort.
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.