Some common themes could include internal conflict. The characters would have to grapple with their own feelings and the knowledge that their relationship is not socially acceptable. There might also be themes related to protection. For example, Harry might feel an even stronger need to protect his sister because of their romantic relationship. And the theme of sacrifice could also come up, as they might have to sacrifice their relationship for the greater good of their family or the wizarding world.
Yes, there could be. Fanfiction is all about exploring different and often non - canonical relationships. But this particular theme might not be very common as it goes against the general perception of family relations. If you look for it, make sure to approach it with an open mind and also be aware of the boundaries of acceptable content.
One common theme might be the struggle against societal norms. Since this kind of relationship is not acceptable in the normal world, the fanfiction could explore how the characters deal with the outside world's judgment. But this is still a very controversial theme.
At first, they might be a bit competitive, especially in their studies at Hogwarts. But then, when they realize that they are stronger together, their relationship deepens. They could have heart - to - heart talks late at night in the Gryffindor common room. Also, if one of them gets into trouble, like the twin sister accidentally breaks a school rule, Harry would cover for her and vice versa. This would build a strong bond of trust between them. And as they face the challenges of the wizarding world together, their relationship evolves into one of unwavering loyalty.
Hermione would still be a very popular character. She could be the one to help the twin sister study and understand the more complex aspects of magic. Her logical thinking and vast knowledge of magic would be invaluable in their adventures.
Their parents' old friends could be main characters. They might come to check on Harry and his sister, bringing gifts and stories about their parents. These friends could offer guidance and protection when needed.
No, it's not appropriate at all. Incestuous relationships are not acceptable in mainstream society and most moral codes. Even in the realm of fanfiction, it goes against basic ethical and moral values.
Romance between Harry Potter and his sister goes against the original canon and can be considered quite abnormal. However, if you still want to explore fanfiction in this regard, you could try searching on some large - scale fanfiction websites like Archive of Our Own. But be aware that such content may not be in line with the general moral and ethical concepts of the original work.
Obviously, Harry Potter himself is a central character. His sister would be the new addition. Hermione and Ron are likely to be there as well. They are Harry's best friends in the original series and would probably play important roles in the fanfiction too. Dumbledore might also appear, as he is a very important figure in the wizarding world and could guide the sister in her magical journey.