The Weasley family would have mixed reactions. Mrs. Weasley might be a bit put off at first, thinking Fleur is too different. But as she gets to know Fleur better in the context of her marriage to Harry, she would come around. Bill, being Fleur's husband in the original story, would be very protective at first but eventually see the good in their relationship.
Hermione would probably be a bit skeptical at first. She might worry that Harry is rushing into things. But once she sees how happy they are, she would be supportive. Ron, on the other hand, would be more accepting from the start, especially if there are good feasts at the wedding.
Dumbledore, if he were still alive, would likely see it as an interesting development. He might view their marriage as a symbol of unity between different magical cultures. The other Hogwarts professors would also have different views. Professor McGonagall might be strict in her initial assessment but would warm up to it over time, while Professor Snape would probably be sarcastic about it, but secretly hope that Harry finds some happiness in this new relationship.
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.
Harry might be a bit flustered at first. He's not used to the attention from someone like Fleur. He could be shy and a bit unsure of how to handle it.
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.
At first, Harry would likely be shocked and angry. He's used to being in dangerous situations, but being kidnapped by Fleur, someone he thought was an ally, would be a big betrayal. He'd probably try to fight back immediately, using his magic if he could.
It might explore their relationship through the lens of compromise. Since they are bound by the marriage law, they have to find ways to meet in the middle. For example, Harry might have to adapt to Fleur's more refined lifestyle, and Fleur might need to understand Harry's Gryffindor impulsiveness. Another way is through shared adventures. The marriage law could send them on quests or tasks that force them to rely on each other, deepening their relationship.
It might develop through a series of misunderstandings at first. Fleur might misjudge Harry as just a famous hero, and Harry might be a bit intimidated by Fleur's Veela charm. But as time passes, they start to see the real person behind the surface. They might work together on a project to help young wizards affected by the war. Through this cooperation, they discover each other's true personalities, and their relationship evolves from there, gradually leading to their marriage.
At first, their relationship might be a bit strained. Harry is used to his own space and friends, and Fleur has her own circle. But as they live together, they'll start to respect each other's differences. For example, Fleur might be more flamboyant in her magic use, while Harry is more practical. They'll start to see the value in each other's approaches and become closer friends.
Fleur could be in awe. Harry's scars are a testament to his battles and his survival. She might see him as an even greater hero than she already thought. She could start to treat him with more respect and admiration, perhaps even looking up to him in a new way.
Fleur and Tonks might start off a bit wary of each other. Fleur, with her proud and somewhat haughty nature, could see Tonks as a bit too brash. But as they both love Harry, they would have to find common ground. They could start sharing stories about Harry's heroic deeds from their different perspectives. Eventually, they would become friends and support each other in the relationship with Harry.
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.