It would likely be full of warm family moments. Harry would grow up surrounded by the Weasley chaos and love. He'd have a different kind of Hogwarts experience, with the Weasley family values influencing his every move at school.
In this fanfiction, a possible plotline is Harry's influence on the Weasley family. Since he has his own experiences with Voldemort, he could teach the Weasleys some new defense magic or strategies. Also, the Weasleys' financial situation might change as they take on Harry. They might have to find new ways to support the family with an extra member. And of course, there could be a plotline about how Harry deals with the Weasley parents as his own. Molly Weasley's motherly love could be both a comfort and a challenge for Harry as he grows up in this new family setting.
In this fanfiction, Harry's character development is quite significant. Growing up with the Weasleys, he learns the value of loyalty and togetherness. He starts to see family not just as blood relations but as those who are there for you. His experiences with the Weasleys also make him more adaptable. He has to deal with different personalities within the family, which helps him become more patient and understanding. Moreover, he may develop a different sense of humor, influenced by the Weasley family's light - heartedness. His relationship with magic may also change as he learns from the Weasley family's unique magical traditions.
Well, Harry Potter is the central figure, but the Weasley siblings are key too. Fred and George could be like his fun - loving older brothers, teaching him all kinds of mischievous spells and pranks. Ginny would be like a sister, and their relationship could develop in a really interesting way. And Percy, despite his differences from the rest of the family, would also be an important character as Harry would be part of the family dynamic that Percy is also a part of.
One possible reason could be that Harry has post - war trauma. He might have seen so much death and destruction during the war that he doesn't want to bring his darkness and pain to the Weasleys. He may think that staying away is a way to protect them from his own emotional turmoil.
At first, the Weasleys might try to reach out to Harry. But as he continues to avoid them, they could start to feel rejected. This might lead to some resentment building up, especially among the younger Weasleys who don't understand why Harry is acting this way. For example, Ron might be really frustrated as he considered Harry one of his best friends.
I'm not sure if it's a popular fanfiction. It's such a dark and against - the - grain concept for the 'Harry Potter' fandom that it might not have a large following. Most fans are used to the positive relationships between Harry and the Weasleys in the original series.
I haven't actually read this specific fanfiction, but it's a very dark and disturbing concept. In the normal 'Harry Potter' universe, Harry and the Weasleys are friends. So this fanfiction probably involves some sort of dark plot twist or alternate reality where Harry turns against them for reasons that could range from being influenced by dark magic to some misinterpreted prophecy or a huge misunderstanding.
In this fanfiction, the betrayal might also stem from jealousy. Harry is often in the spotlight, and the Weasleys, who have always been a big family but not always in the center of attention, could let envy get the better of them. This could lead to actions that Harry perceives as betrayal, like spreading rumors or withholding support when he needs it most.