Isolation and connection could be a major theme. Harry is isolated after being neglected, and Daphne is also somewhat on the fringes in the Slytherin house. When they come together, it's about breaking through their individual isolations and forming a unique connection. Their relationship might show how two people who seem different on the surface can find common ground and build a strong bond that helps them both overcome their feelings of being alone in the wizarding world.
Well, perhaps in this oneshot fanfic, Harry is neglected by his so - called friends at Hogwarts. Daphne notices his sadness and starts to interact with him. She might introduce him to her family's magical traditions which are quite different from what Harry has known. They could bond over their shared love for magical creatures that are often overlooked, like the Bowtruckles in the Forbidden Forest. Through their adventures together, Harry starts to feel less neglected and more part of a new kind of community.
One common theme is the exploration of an alternative relationship. Since it's not a canon pairing, writers like to show how Harry and Daphne could get together in different scenarios.
One characteristic is the exploration of the supernatural element. With Harry as a vampire, there are often descriptions of his enhanced abilities like super strength and speed, which add an exciting dynamic to his relationship with Daphne.
The theme of redemption can also be found. Daphne is often from a Slytherin family, and in some fanfics, she has to overcome the negative stereotypes associated with her house. Her relationship with Harry helps in this redemption arc.
One great 'vampire harry x daphne fanfic' is 'Blood Ties'. It explores the unique relationship between vampire Harry and Daphne. Harry's vampiric nature adds an interesting twist to their interactions, and Daphne's character is well - developed as she navigates this new relationship with a dark Harry.
It's appealing because it offers a different take on the Harry Potter universe. Instead of the traditional pairings, this combination allows for new relationships and storylines to be explored. For example, Daphne's Slytherin cunning and Astoria's charm along with Harry's heroism can lead to very engaging plotlines. Also, the fanfic can explore how the three characters from different houses can overcome their differences and form strong bonds, which is a really interesting concept in the context of the Harry Potter world which is so house - divided.
One good 'harry x daphne x astoria fanfic' is 'The Unlikely Trio'. It explores an interesting dynamic between the three characters. The story has great character development and a unique plot that sets it apart from other fanfics in the Harry Potter fandom.
When writing a neglected Harry x sister fanfic, consider the setting carefully. The wizarding world has its own rules and dynamics which can play into the neglect and the relationship. You could have the sister be a Squib, for instance, which might lead to her being neglected. Then, plot out a series of events that will force Harry and his sister to interact. Maybe they have to team up to solve a mystery. As you write, use dialogue effectively to show the growth of their relationship. For example, in the beginning, their conversations might be short and full of tension, but as they get closer, the dialogue becomes more open and affectionate.
I also like 'Daphne's Bond with Harry'. It focuses on the emotional connection between them and how they support each other through various challenges.