Daphne might be developed by showing her internal struggle with the allure of the Death Eaters' power. She could be initially attracted to the idea of power and status that comes with being associated with them. However, as she witnesses the true brutality and evil of the Death Eaters, she has to make a choice. This choice could be a turning point in her character development, either leading her to fully embrace the side of good or fall deeper into the wrong path until Harry manages to pull her back.
Daphne could start off as a typical Slytherin, somewhat cold and reserved. As she gets involved with Harry and the fight against the Death Eaters, she could become more empathetic. For example, seeing the harm the Death Eaters cause to innocent people might make her question her family's values. She could develop into a more complex character, torn between her family loyalty and what she knows is right.
Her character could be developed through her interactions with Harry. Maybe at first she is dismissive of him because of the Gryffindor - Slytherin rivalry. But as they are forced to work together against the Death Eaters, she discovers Harry's courage and selflessness. This could lead her to change her own perspective and become more open - minded and brave herself, taking risks to oppose the Death Eaters even when it goes against her family's wishes.
One idea could be that Daphne, who may be on the verge of being lured into the Death Eaters' ideology, is saved by Harry. Harry discovers that Daphne has some family pressure to side with the Death Eaters. He tries to show her the true nature of Voldemort and his followers. They form an unlikely alliance and work together to expose some of the Death Eaters' secrets within Hogwarts.
Daphne could be a shy and artistic girl. She might be into painting or writing, and she sees Harry as this source of inspiration. Maybe she first noticed Harry in an art gallery or a library, and that's when the crush started.
In this fanfic, Harry would likely grow in his social skills. Since Daphne has different social circles, he'd be introduced to new people and ways of interacting. He might become more diplomatic, learning from Daphne how to handle different personalities gracefully. Daphne would develop a stronger sense of loyalty. As she gets to know Harry better, she'd see his unwavering loyalty to his friends and causes, and this would inspire her. She might also become more adventurous, as Harry often gets into exciting (and sometimes dangerous) situations, and she'd be drawn into them, expanding her own boundaries.
Daphne could be a fictional character created specifically for this fanfic. She might be a witch from a well - known wizarding family. Maybe she's a classmate of Harry's at Hogwarts or someone who has just heard about his situation and feels compelled to help.
In some fanfics, their characters are developed through shared adventures. They might face dangerous situations together, like a duel with a rogue Death Eater. During these encounters, Harry's courage and Daphne's quick thinking combine. This not only helps them survive but also makes them realize how much they can learn from each other. Harry might become more cunning in his strategies, and Daphne could become more selfless in her actions.
Their relationship could be one of mutual protection. Harry, with his heroic nature, would always be ready to defend Daphne. And Daphne, being intelligent and resourceful, could offer her own kind of support to Harry, like helping him with his studies or providing advice in tricky situations.
Often, her character is developed as a more complex Slytherin. She's not just the typical Slytherin stereotype. For example, in some fanfictions, she has a strong sense of loyalty that is not just towards her house but towards what she believes is right, which may lead her to side with Harry Potter.
Daphne often provides a different perspective. For example, she might have knowledge of certain magical traditions that Harry is unaware of. This helps him in tasks where such knowledge is crucial.
In the fanfiction, their relationship could develop in a rather unexpected way. Since they live together, they are constantly in each other's presence. Harry might start to teach Daphne some of his Quidditch moves in the backyard, and Daphne could introduce Harry to some of the more sophisticated Slytherin social etiquette. As they engage in these activities together, they start to respect and admire each other more. Eventually, this could lead to a romantic relationship or a very deep friendship depending on how the author wants to take the story.
Daphne could be developed further by showing her as a patient teacher. Since Bloom is a baby, she would need to be very patient while teaching her simple magic tricks or about the history of their world. For example, she could spend hours showing Bloom different magical plants and explaining their uses. Another way is to show Daphne's protective side more. She could be constantly on guard, using her magic to create shields around Bloom whenever there's a hint of danger.