One possibility is that Harry grows up in a more refined and magical environment. The Delacour family might introduce him to different aspects of French magic. He could be trained in unique spells and magical traditions. Also, he might have a different relationship with the magical community, perhaps being more involved with international magical relations from an early age.
Maybe Harry would have a different view on the wizarding world. Growing up with the Delacours, he'd be exposed to a more international magical community from a young age. So, instead of being so focused on the British wizarding world's problems like Voldemort, he might be more interested in international magical relations and how to unite different magical cultures.
Well, one possible plot could be that after Harry's difficult life at the Dursleys, Fleur Delacour discovers his situation. She decides to adopt him out of pity and a sense of justice. Harry then gets to experience the wizarding world from the perspective of the Delacour family. He might learn different magic techniques that are more common in the French wizarding community. He could also form new friendships with Fleur's younger sister or other relatives. And perhaps he'll have a different role in the fight against Voldemort, with the support and resources of the Delacour family.
Well, it might be that the Bones family discovers baby Harry after the death of his parents. They could raise him with a strong sense of justice, which is characteristic of the Bones family in the Harry Potter universe. Harry might grow up learning different magic skills from the Bones family traditions, and perhaps have a different perspective on the wizarding world compared to the original story.
One possible plot could be that the soldiers instill in Harry a sense of discipline and combat skills from a young age. He might grow up with a military - style routine, which would make his Hogwarts experience very different. For example, he could be more organized in his studies and dueling, approaching them like military strategies.
Well, one interesting plot could be how Harry adapts to the Delacour family's different culture and traditions compared to the Dursleys. Maybe he learns new magic that is specific to their family heritage.
Well, perhaps in the fanfiction, Gabrielle Delacour is in a cooking class at Beauxbatons. They are learning to make a special magical dish that requires a lemon. But this lemon is no ordinary lemon. When Gabrielle starts to use it in the recipe, it starts to glow and create a portal. Through this portal, she enters a parallel wizarding world where the rules of magic are slightly different. There, she has to find a way to get back home while also dealing with the challenges of this new world, all with the lemon as her starting point.
One possible plot could be that after the war, Harry Potter travels to France for some reason, perhaps for international magical cooperation. There he meets Gabrielle Delacour again. They start to bond over their shared experiences of the Tri - wizard Tournament and the fight against the Dark Lord. Gabrielle has grown into a confident and intelligent witch. As they spend more time together, they realize their feelings for each other and eventually get married. Their marriage could also bring the wizarding communities of Britain and France closer together.
The plot might involve Harry being taken to the Demon World at a young age. There, he'd be raised among demons. Hiei would likely be a strict mentor. Harry would have to learn to survive in a cut - throat environment. His magic could blend with the demon powers in unique ways. For example, his Patronus could take on a more demonic form.
Perhaps a major plot twist is that Harry's connection to Voldemort is affected. In the original story, his connection was partly due to his being a Horcrux. But growing up with the Delacours, he could have been protected in a different way that changes this connection. He might not have the same nightmares or visions as he did in the books. Also, his role in the Triwizard Tournament could be completely different. Instead of being the unexpected fourth champion from Hogwarts, he could be an observer or a special guest from Beauxbatons, which would change the whole dynamic of that event.
Maybe Fleur has some ulterior motive. She could be under the influence of a dark wizard who forces her to kidnap Harry. Or perhaps she believes Harry has something she needs desperately, like a powerful magical item that she thinks can save her family or something.