One way this could be possible is if we consider the idea of multiverse in fanfiction. There could be a universe where the boundaries between different fictional settings are blurred. Draco Malfoy's family in the Harry Potter world could have a connection to Annabeth's family in the Percy Jackson world that was previously unknown. It could be a family secret that was lost over time and now, in this fan - created scenario, is being explored.
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.
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.
One interesting aspect of Draco Malfoy and Annabeth Chase fanfiction could be their different magical abilities coming together. Draco is from the wizarding world of Harry Potter with his knowledge of spells and potions. Annabeth, from the Percy Jackson series, has her demigod powers and strategic mind. In a fanfic, they could team up to solve a mystery that involves both the magical and the mythological world. For example, a powerful magical - mythological artifact has been stolen and they need to use their combined skills to retrieve it.
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.
One way this could work is if there was a shared ancestry that was hidden or lost over time. Perhaps there was an ancient clan that had members in both the Naruto world and the Fairy Tail world. Through some convoluted plot device in the fanfic, Naruto and Erza could be discovered to be part of this long - forgotten clan, thus making them siblings.
Their meeting would be quite intense. Draco, with his haughty demeanor, might initially look down on Annabeth. But Annabeth, being the strong - willed demigod she is, would not take any of his nonsense. She would likely stand up to him immediately, which would either make Draco respect her or become even more antagonistic.
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.
A plot could involve Draco Malfoy being sent on a mission by the Ministry of Magic that somehow intersects with the world of Will Solace. Draco is used to the hierarchical and often dark - tinged world of magic, but in Will's world, he discovers a different kind of power structure based on the gods and demigods. Will Solace, with his healing powers and kind heart, might be intrigued by Draco's complex past and magical abilities. They could end up learning from each other, with Draco teaching Will some wizarding magic and Will teaching Draco about the powers of the demigods.
One way they could be brothers in a fanfiction is if there was a mix - up at the orphanage or some sort of magical interference in their early lives. Maybe a powerful spell was cast that made them related, and as they grew up, they had to deal with the strange connection while still having their different personalities and allegiances at Hogwarts. Draco, with his pure - blood family values, and Harry, with his own sense of justice, would have a very complex relationship.
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.
A plotline could involve Draco's family trying to hide his non - pure - blood origin for generations. When Draco finds out, he could start to question his family's values and actions. He might then try to find out who his non - pure - blood ancestors were and what their story was. Maybe he forms an unlikely alliance with some non - pure - blood characters in Hogwarts as he tries to come to terms with his new identity. There could also be a plot where the discovery of his non - pure - blood status changes his relationship with Harry Potter. Instead of being rivals, they could become allies as Draco realizes the unfairness of the blood - based discrimination in the wizarding world.