Hermione could be a main supporting character. She might use her intelligence to help Harry and Fleur understand the legal and magical implications of the marriage contract. Ron could also be there, providing some comical relief and also being a loyal friend to Harry during this strange situation.
Well, in fanfic, the Harry and Fleur marriage contract might be interesting in terms of character development. For Harry, it could force him to grow up faster and deal with adult - like responsibilities. Fleur, on the other hand, might have to adjust her view of Harry from just a famous hero to a life partner. Also, the magic involved in the contract itself could be a cool element. Maybe there are special spells or enchantments that are unique to their contract that the author invents, which could add a whole new layer of mystery to the story.
In the fanfiction, the marriage contract might involve Fleur and a character like Harry Potter himself. This could create a whole new dynamic. Fleur might see it as an opportunity to get closer to the hero of the wizarding world, or it could be a source of conflict between her and Ginny, who has feelings for Harry. There could be all sorts of magical stipulations in the contract, like they have to perform certain spells together or pass a series of wizarding trials as a couple.
Well, perhaps a plot twist is that the marriage contract was actually a misinterpretation all along. It was originally written in an ancient magical language that was misread, and instead of a marriage contract, it was a pact for magical knowledge exchange. So, Harry and Fleur have to figure out how to deal with this new understanding and the expectations of their families and friends. It also might be that the contract was magically altered by a dark wizard long ago, and as they dig deeper into it, they uncover a conspiracy that dates back generations.
Often, Harry's sense of responsibility grows. He starts to see the marriage contract as not just a burden but also an opportunity to create a new life for himself and Fleur. Fleur's personality may develop in a way that she becomes more protective of Harry. For example, when they face opposition from the wizarding community about their contract, she stands up for them. She also might help Harry to overcome his insecurities about being in a relationship with someone as glamorous as her.
It could make Ron and Hermione a bit jealous. Since Harry is their best friend, his sudden marriage contract with Fleur might make them feel left out or worried about how it will change their friendship. For Fleur's side, her relationship with Bill might become a bit strained as she is now in a contract with Harry. And the Weasley family in general might be a bit cautious or have mixed feelings about this new development.
Well, perhaps the marriage contract was made with an evil wizard. Fleur has to figure out a way to protect herself and her family. She teams up with some of the Order of the Phoenix members who are also interested in the ancient magic involved in the contract. They research in the Hogwarts library and other secret places to find a way to nullify the contract. In the process, Fleur also has to deal with the wizard who is trying to enforce the contract and his minions. This could lead to some exciting battles and tense moments.
One interesting plot twist could be that the marriage contract was actually a ruse by a dark wizard to gain control over both Harry and Fleur. So they have to team up to break the contract's hidden enchantments.
A possible plot could be centered around the two of them falling in love in an unexpected way. Despite the marriage contract being an initial binding factor, they might discover that they have more in common than they thought. Harry's experiences with facing dark magic and Fleur's own determination to prove herself in the wizarding world could draw them together. They could start off as reluctant partners but gradually develop real feelings through shared adventures and mutual understanding.
Well, Hermione would probably be one of Harry's supporters. She's always been his friend and would likely see the potential good in the marriage contract. She might help Harry understand Fleur better and encourage him to make the best of the situation. On Fleur's side, her sister Gabrielle could be a strong supporter. Gabrielle looks up to Fleur and would want her to be happy in this new arrangement, and she could also help Fleur adapt to any new cultural or family aspects related to Harry.