The story would be radically different. Draco being Harry's older brother would mean a different upbringing for Harry. He might not have grown up with the Dursleys. Instead, he could have been with the Malfoys. This would expose him to a different set of values and magic early on. At Hogwarts, their relationship would change the houses' relationships too. Gryffindor and Slytherin might not be as opposed to each other. And in the fight against evil, they would have a stronger, more family - based motivation to defeat Voldemort.
Well, it would change a lot. For one, Draco's family would have a different connection to Harry. Instead of being rivals, they might be more protective of Harry. Draco could use his pure - blood status to shield Harry from some of the prejudice in the wizarding world. Also, the whole dynamic at Hogwarts would shift. Draco might be more like an older brother figure to Harry, guiding him in certain aspects of magic and school life, which would be very different from their original hostile relationship.
If Harry were Draco's older brother in this fanfiction, their relationship at Hogwarts would be a total mess - up of the original dynamic. Harry would be constantly torn between the Gryffindor values he adheres to and his family bond with Draco. Draco might start to question his Slytherin - only ideology because of his connection to Harry. For example, they might find themselves in situations where they have to choose between their house loyalties and their new - found brotherly bond, like during the Quidditch matches or the Triwizard Tournament.
This fanfiction concept is really interesting. Harry being Draco's younger brother would mean a different upbringing for Harry. He'd have access to the Malfoy's wealth and status. However, his personality might still shine through. He might be a Slytherin with a heart of gold, trying to change the family's views from the inside. His relationship with Dumbledore would also be different as Dumbledore might see him as more of a 'project' to save from the Malfoy influence.
In a fanfiction where Harry is Draco's brother, it would be a wild shift in the story. The sorting ceremony might have been really interesting. Harry could have been conflicted between Gryffindor and Slytherin. His friends in Gryffindor might have been very suspicious of him at first. His relationship with Sirius would also be strange. Sirius hated the Malfoys, so would he still be as fond of Harry? And Harry's magical abilities might have been nurtured in a different way, perhaps more towards the Dark Arts, which could have made him a very different kind of wizard.
They could have a really complex relationship. Draco would be protective yet also have his Slytherin pride. Harry might look up to Draco in some ways, like for his knowledge of the wizarding world. But they could also have their disagreements, especially when it comes to things like blood purity. However, at the end of the day, the brotherly bond would still be there.
His brother could introduce new alliances. If he's more friendly or has different views from Draco, he might make friends with characters that Draco wouldn't usually associate with. This could lead to new storylines where Draco has to deal with these unexpected connections.
In fanfiction, the idea of Harry being Naruto's older brother might be possible if we consider that both characters have some similarities in their personalities. They are both determined and face great challenges. So, a writer could create a backstory where there is some sort of connection between their two worlds that makes them family. For example, perhaps a wizard from the Harry Potter world visited the Naruto world long ago and had a relationship that led to Harry and Naruto being related.
Well, it would completely change their relationship. For one, Draco might be more protective of Hermione. He might not be as mean to her as he was in the original story. He could use his Slytherin influence to shield her from some of the nastier Slytherins. Instead of the constant bickering, they could have a more brother - sisterly bond where they secretly look out for each other. For example, Draco could help Hermione with some of the pure - blood politics she doesn't understand while Hermione could help Draco with his studies.
In the fanfiction, the older brother could change Naruto's view of his family and his place in the world. Naruto would have a connection to his past that he didn't know before. This could lead him to explore more about the Uzumaki clan and discover hidden powers or knowledge. And it could also affect his relationships with Sasuke and Sakura. For instance, his brother could help him understand Sasuke's pain better, leading to a different dynamic between them.
At Hogwarts, Harry would have someone to look up to within his family. This could boost his self - esteem. His older brother could be popular, and through that, Harry might gain more friends. Also, they could team up in Quidditch, making Gryffindor's team even stronger.
Well, it would likely make their relationship much more complex. Instead of the typical rivalry, there could be a sense of family obligation. Draco might feel protective of 'her' in a different way than he would a male Harry. He might be torn between his family's views and this new connection to Harry.