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.
The exploration of new magic is another theme. Since they are delving into very dark and ancient magic related to Horcruxes, they often come across new spells, potions or magical artifacts that are not part of the regular wizarding knowledge. This adds an element of mystery and discovery to the fanfiction. Some fanfictions might have them discover a spell that can temporarily disable a Horcrux's protective charm, which is something they have to figure out through research and trial and error.
There's also 'Horcrux Hunt: The Unseen Bond' which delves deep into the relationship between Harry and Hermione during their search. It has some really creative interpretations of how they overcome the obstacles related to the Horcruxes. In this fanfiction, they face not only the danger of the Horcruxes themselves but also the political unrest in the wizarding world at the same time. Their friendship is put to the test and grows stronger as they progress in their hunt.
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.
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.
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 theme of self - discovery for Ginny is often seen. As she delves deeper into the situation of Harry being a Horcrux, she might discover new aspects of herself, like her own strength in dealing with such a complex and dangerous situation. And there's also the theme of hope, that despite the seemingly impossible situation, there is always a way to save Harry and defeat Voldemort.
Well, identity exploration is a big one. Harry has to figure out what it means to be a Horcrux on top of being the Boy Who Lived. There is also the theme of moral conflict. He is part of Voldemort's dark creation, yet he is the symbol of hope. How does he balance this? Another common theme is the exploration of magic. Since he is a Horcrux, there could be new and different magical aspects to his being that fanfic writers can explore, like how his Horcrux - ness affects his magical abilities or his connection to other magical objects.
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.
In many fanfiction works, Hermione being a Horcrux is a fascinating concept. It gives a whole new dimension to the story. By making Hermione a Horcrux, it creates a complex situation. The other characters would have to deal with the fact that she is not only their friend but also a container of a part of Voldemort's soul. This could change the dynamics of their relationships. It also opens up possibilities for new magical solutions to defeat Voldemort, as they would have to find a way to destroy the Horcrux within Hermione without harming her.
In some fanfictions, Draco might use his knowledge of the Dark Arts and Hogwarts' secrets. Since he was raised in a Death Eater family, he could have insights into how Voldemort might have hidden the Horcruxes. For example, he might know of certain places within the school that Voldemort frequented or had an interest in.
One common theme is the exploration of their relationship. Since in the original books they were just friends, fanfictions often look at how they could become more. Another theme is adventure. They might go on quests together that weren't in the original series. And of course, the theme of growing up and dealing with the challenges of the wizarding world as a couple is also quite common.