Such a fanfiction would entail exploring their different cultures. Draco is from a world of wizards, with Hogwarts and its Houses, while Nico is part of the demigod world. The story could show how they introduce each other to their respective friends and allies. There would be a lot of misunderstandings at first. For instance, Draco might not understand Nico's connection to the underworld, and Nico might be confused by Draco's pure - blood mania. But as they spend more time together, they start to see past these differences and find common ground, creating a unique and engaging story.
In fanfiction, this could be the result of a multiverse concept. Suppose there are infinite parallel universes. In one of these universes, the rules are different and somehow the Malfoy family and Nico's family are connected. Draco and Nico might initially be in disbelief but then gradually come to accept it. Their relationship could be full of tension at first, given Draco's often haughty attitude and Nico's own guarded personality. But as the story progresses, they could start to rely on each other and form a unique bond that is different from the relationships they have in their original storylines.
Often, he is used to create more complex family relationships. He might be caught between Draco's actions and his own beliefs. He could try to redeem the family name in some fanfictions, which adds a new layer to the Malfoy story. He may also be in a love triangle or have some other romantic entanglements that further complicate his character and the overall plot.
Well, in some fanfictions about Draco Malfoy's little brother, he could be a bit of a rebel. He might not want to follow in the traditional Malfoy footsteps. He could be interested in Muggle things, which would be a huge shock to his family. This would lead to some really exciting plotlines where he has to hide his interests and navigate his family's expectations.
Another theme is redemption. The older brother may be seen as a character who has the potential to redeem the Malfoy name. He could be involved in good deeds that counteract the family's association with the Dark Arts. This can involve helping out other Hogwarts students or working against Voldemort's regime in a discreet way. It's a way of showing that not all Malfoys have to be on the side of evil.
One interesting fanfiction could be 'The Malfoy Heir'. In this story, Draco's older brother is portrayed as a complex character who has to deal with the family's expectations in a different way than Draco. He often tries to protect Draco from the harsher aspects of their family's dark reputation. It shows a different side of the Malfoy family dynamics that we don't often see in the original series.
Their relationship would be a mix of rivalry and mutual respect. Draco might initially look down on Annabeth because she's not from his world, but Annabeth's strength and quick thinking would soon make him change his mind. They could have some heated arguments about the best way to do things, but deep down, they would care for each other as siblings. For example, Draco might use his magic to protect Annabeth when she's in danger in the wizarding world, and Annabeth would use her strategic skills to help Draco in his own battles.
Well, in fanfiction, anything can be possible. Maybe some sort of magical or divine intervention could be the reason. For example, a powerful wizard or god could have manipulated events to make them siblings across different fictional worlds. It could also be due to some sort of alternate reality where the rules of both the Harry Potter and Percy Jackson universes are blended in a unique way.
At first, they could be quite competitive. The older brother, having more experience and knowledge, might overshadow Draco. But as time goes on, they could grow closer. For instance, if the older brother gets into trouble, Draco could be the one to help him out, which would strengthen their bond.
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.