If Percy reads positive fanfiction about Magnus, he might develop a new - found respect for him. He could start to think of Magnus as more of an equal in the world of demigods, even though they are from different mythologies. For instance, if the fanfiction shows Magnus doing heroic deeds, Percy would recognize the similarities between their roles as heroes. However, if the fanfiction portrays Magnus in a negative way, Percy might be a bit more cautious around him, wondering if there's some truth to those made - up aspects.
Percy could also become more curious about Magnus. He might seek Magnus out to ask him about things he read in the fanfiction. This could lead to them sharing stories and experiences, strengthening their bond as demigods. They could start comparing their different mythologies more in - depth, like how their respective gods interact with mortals or how they train new demigods. This exchange of knowledge could bring them closer together and make them better allies in the face of future threats that might involve both Greek and Norse mythologies.
He might be amused. Percy has his own set of adventures, but reading about Magnus' would probably make him chuckle at the different takes on Norse mythology in the fanfiction.
The Titans from Greek mythology could also be a good choice. Imagine if the Titans, who are still bitter about their defeat by the Olympians, team up with some of the more malevolent Norse giants. They could try to take over both the Greek and Norse realms, forcing Percy and Magnus to join forces to stop them.
Percy's water - based powers and Magnus's ability to communicate with the dead could create some really interesting scenarios. For instance, Percy could use water to expose hidden passages in cemeteries where Magnus could then communicate with the spirits to get information.
One great fanfic is 'The Adventures Beyond Borders'. It combines the worlds of Magnus Chase and Percy Jackson in a really cool way. The characters interact in a believable manner, and the plot is full of action and adventure. It has some really exciting fight scenes and also delves into the relationships between the different characters from both series.
I really like the idea of Percy and Magnus just chatting about their lives. Percy talking about his experiences with the Greek gods and Magnus sharing his Norse - related adventures. It would be a simple but really engaging interaction.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There are tons of great Magnus Chase and Percy Jackson fanfics there. Just use the search function and type in the relevant tags.
A good fanfic should have a well - developed plot. For example, it could involve a new threat that requires both Magnus Chase and Percy Jackson to team up. It should also stay true to the original characters' personalities. Percy is brave and impulsive, while Magnus is more of a reluctant hero, and these traits should be maintained.
Another idea is a setting where the two worlds are merging. Percy and Magnus find themselves in a strange new place that has elements of both Camp Half - Blood and the Hotel Valhalla. They have to figure out how to survive in this new world while also dealing with the chaos that the merging is causing. The characters from both series could interact in interesting ways, like Annabeth and Samirah comparing their knowledge of architecture and magic respectively.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). There are countless stories there. Just search for 'Magnus Chase Percy Jackson' and you'll get a ton of results. Some are crossovers that combine the two universes in really interesting ways, like having the characters meet and go on adventures together.
Time - travel is another trope that shows up. Writers might send Percy or Magnus back in time to change something in the other's world. It creates a lot of opportunities for adventure and exploring different time periods in the Riordanverse. This can also lead to some really cool crossovers between the mythology of the two series.