Well, it could be really interesting. The magic from the Kane Chronicles and the powers of the demigods in Percy Jackson could interact in unique ways. For example, Percy's control over water and Carter's ability to use the power of the Egyptian gods might combine to create some kind of super - elemental force. And they could also have cultural clashes and misunderstandings at first. Percy might not understand all the complex Egyptian magic rituals, and the Kane siblings could be confused by the Greek idea of the gods living on Olympus. But as they get to know each other better, they'd learn from one another and become a strong team against whatever threats come their way.
In such a fanfiction, Percy could team up with the Kane siblings to fight a common enemy. Maybe they face a powerful ancient monster that threatens both the Greek and Egyptian mythological worlds.
Carter and Annabeth could be a great pairing. Carter is very knowledgeable about Egyptian mythology and magic, and Annabeth is brilliant when it comes to Greek mythology and strategy. They could share their knowledge and come up with some amazing plans. They might start off a bit competitive, each thinking their own mythology is better, but as they face challenges together, they'd start to respect and rely on each other.
I think Anubis could be an interesting character in this fanfiction. He has his own mysterious nature in the Kane Chronicles. If he meets Percy, there could be some really strange and exciting interactions. Anubis could be intrigued by Percy's connection to the Greek gods and his unique powers. Maybe Anubis would even offer some help or pose a new threat, depending on how the story is written.
Well, there's a fanfic called 'Crossing Realms'. In this one, the Egyptian magic system from the Kane Chronicles and the Greek mythology elements of Percy Jackson collide. It has some really cool fight scenes where the powers of both universes are pitted against each other. The author does a great job of making the two different mythologies work together in the story.
Well, they might start off as rivals at first. Percy, coming from the Greek side, and Carter from the Egyptian side, could have different ways of doing things. But as the story progresses, they realize they need to work together. For example, Percy could teach Carter about the Greek concept of heroism, while Carter could introduce Percy to the complex magic of the Egyptian world. And they could end up saving both their worlds from a great disaster.
One great 'Percy Jackson Kane Chronicles' fanfiction is 'The Crossover Quest'. It combines the two universes really well, with exciting plot twists. The characters from both series interact in a very believable way.
One idea could be that the demigods from Percy Jackson's world accidentally stumble into the realm of the Kane Chronicles. Maybe Percy, Annabeth and some of their friends are on a quest near a portal that leads to the Egyptian magical world. Once there, they meet Carter and Sadie Kane. They soon realize that there's a common enemy that is affecting both their worlds, like an ancient evil that was sealed away long ago but is now starting to break free. They have to combine their powers, the Greek magic and the Egyptian magic, to fight it off. For example, Percy's control over water could be used in creative ways in the Egyptian deserts, and the Kane's magic could help the demigods in understanding some new types of magical threats.
It could be a villain who wants to merge the Greek and Egyptian mythologies in a chaotic way. Maybe a powerful sorcerer who thinks that by combining the powers of the two worlds without any order, he can become the ultimate ruler.
First, know both universes well. Read the original books thoroughly. Then, create a unique plot that can blend the two worlds in an interesting way. For example, you could have a quest that involves both Greek and Egyptian mythology elements.