Well, a possible plotline is that they discover a Horcrux in a place that was previously thought to be just a mythical or lost location. Maybe it's hidden in an ancient wizarding ruin that has been long forgotten. As they search for this Horcrux, they encounter all kinds of magical creatures and traps. And also, their relationship might develop romantically during the hunt. They share moments of fear and triumph which bring them closer together.
The main characters are obviously Harry and Daphne. Harry, being the Boy Who Lived, has a lot of experience with fighting Voldemort and is determined to destroy all the Horcruxes. Daphne, on the other hand, is likely a Slytherin or has some connection to Slytherin. She brings her own set of skills and knowledge to the Horcrux hunt. Maybe she has a good understanding of dark magic or some family secrets that can be useful.
Another plot could involve Draco actually knowing some secrets about the Horcruxes that he initially doesn't want to share with Harry. But as the danger of Voldemort's power growing becomes more and more real, he realizes he has to help. So, during the hunt, Draco gradually reveals bits of information that he has, which helps Harry in unexpected ways. This could lead to a redemption arc for Draco, as he goes from being on the side of the Death Eaters in a way to actively working against Voldemort by assisting Harry.
One interesting plotline could be how they navigate the wizarding society's reactions. Since Daphne is from a different social circle than Harry, there might be challenges in how they are perceived together. For example, Daphne's pure - blood family might have certain expectations that contrast with Harry's more inclusive views. Another plotline could involve them using their combined magical skills to solve mysteries in the wizarding world. Harry's combat and survival skills along with Daphne's knowledge of potions and magic theory could make them a formidable team.
One possible plotline could be that they meet in the library while searching for a rare book. Harry might be looking for something to help him with a difficult class assignment, and Daphne could be researching dark magic for a different reason. They start off as rivals in this search but gradually develop a mutual respect and then friendship that could potentially turn into something more.
One interesting plotline could be them meeting in a secret place in Hogwarts, like the Room of Requirement. They start off as acquaintances but gradually fall in love as they discover shared interests, like a love for ancient magic spells.
A plotline where Harry, Daphne, and Astoria are all part of a secret club in Hogwarts that is dedicated to uncovering the long - lost magic of the founders. They go on adventures in the castle, searching for hidden chambers and ancient spells. This would bring out their individual personalities and how they interact with each other. For example, Harry's bravery, Daphne's intelligence, and Astoria's creativity could all play important roles in their discoveries.
One possible plotline could be Harry and Daphne exploring the wizarding world together, like visiting hidden magical places. Another could be them facing some kind of mystery at Hogwarts that only they can solve through their combined skills.
The Horcrux hunt with Harry, Fleur, and Tonks in fanfiction could be full of adventure. Harry has his own experience and determination. Fleur could add an element of mystery and allure. Tonks, with her unique magic, is quite a valuable asset. They could start by researching the possible locations of Horcruxes in old wizarding libraries. Fleur might be able to charm the librarians into giving them more access. Tonks could change her appearance to look like a different wizarding scholar. Harry would be constantly on the lookout for any signs related to Voldemort. Their journey would be filled with close calls and unexpected allies.
One idea could be that the character discovers a hidden Horcrux in a place no one expected, like in an old, abandoned wizarding prison. They have to face numerous dark magic traps alone. Another could be that they are being hunted themselves while on the Horcrux hunt, adding an extra layer of danger.
One common theme is the growth of their relationship. As they hunt for Horcruxes together, their bond deepens whether it's a platonic friendship or something more in some interpretations.