Perhaps a character from Game of Thrones could discover they have demigod blood related to the Percy Jackson universe. This would introduce new plotlines. For instance, a young Stark could find out they have Poseidon's blood and suddenly be able to communicate with sea creatures. This would give them an edge in the political and military struggles in Westeros, as they could use the sea for various strategic purposes.
One way they could merge is through a magical portal. Imagine if the demigods from Percy Jackson's world accidentally stumble upon a portal that leads them to Westeros. They might bring their unique powers, like Percy's control over water, and it would disrupt the power balance in Game of Thrones. For example, they could help in battles against the White Walkers, using their god - given abilities. This would change the whole course of the Game of Thrones story.
The Gods in Percy Jackson could take an interest in Westeros. Zeus might see the power struggles and decide to interfere. He could send thunderbolts to help one side or the other, just like he does in Percy's world. This would add a whole new layer of chaos to Game of Thrones, as the people of Westeros would have to deal with not only their own political intrigue but also the whims of powerful Greek gods.
One way could be through magic. In the world of Harry Potter, Tom Riddle is a powerful wizard. In Game of Thrones, there is also magic, albeit different. Riddle could perhaps use his dark magic to cross over into the Game of Thrones universe. Maybe he'd be drawn to the power struggles there, similar to his quest for power in the wizarding world.
Well, in fanfiction, it could also be that there is a common enemy. For example, a powerful ancient being that is a threat to both the demigod world of Percy Jackson and the world that Agents of Shield operates in. This would force them to team up. Percy's powers like controlling water could be really useful in some of the situations that Agents of Shield faces, like dealing with underwater threats or putting out fires in a unique way.
One way they can merge is through character crossovers. For example, a character from Game of Thrones like Jon Snow could be transported into the Warhammer universe. He might find himself in the middle of a battle between different factions in Warhammer, using his skills learned in Westeros to survive. His sense of honor and leadership could also have an impact on the Warhammer characters he encounters.
One way to blend the two universes could be by having Pokemon take on the roles of the various houses' sigils in 'A Game of Thrones'. For example, the Stark family's direwolves could be replaced with a pack of Growlithe or Arcanine. The Targaryens' dragons could be related to powerful dragon - type Pokemon like Salamence or Dragonite. Another aspect could be the political intrigue. In the Pokemon world, there are different organizations and trainers vying for power, much like the houses in 'A Game of Thrones'. Trainers could form alliances and backstab each other in a similar fashion.
Well, in many fanfics, they merge the universes by having some sort of magical or scientific accident. For example, in one fanfic, a portal opened up between Camp Half - Blood and the Young Justice headquarters. The female Percy Jackson then gets sucked into the Young Justice world and has to adapt.
Another way is when a character from one universe is sent to the other on a quest. Let's say Percy Jackson is sent to the Naruto world to retrieve an object that has somehow ended up there. His presence then starts to mix the two universes as he befriends the ninjas and they learn about his world.
One way they could collide is through a magical portal. Imagine Doctor Strange discovers a portal that leads to the world of Game of Thrones. The Avengers could then enter this new world. They might be shocked by the medieval setting and the presence of dragons. Thor, being from a somewhat similar mythical background, could potentially communicate with the dragons. This would lead to an interesting alliance between the Avengers and the dragon riders in Westeros, creating a unique fanfiction scenario.
Writers often start by establishing how a fem Percy Jackson could end up in the Harry Potter universe. Maybe through a magical portal or some kind of cross - dimensional spell. Then they find ways to make her demigod powers interact with magic. For example, her ability to control water might have an unexpected effect on a magical water - based spell in Hogwarts.
The merging could also happen due to a powerful artifact. Suppose there is an ancient artifact in Skyrim that has the power to connect different realms. If it gets activated, it could pull the world of Game of Thrones into Skyrim's universe. Then, the political intrigue of Game of Thrones, like the power struggles in King's Landing, could be introduced to Skyrim's cities. The Nords in Skyrim would have to deal with the complex politics of the Seven Kingdoms.
One way could be through the concept of power. In Naruto, the Rinnegan gives extraordinary powers. In Game of Thrones, power is also a central theme. Maybe a character with the Rinnegan could be teleported into the Game of Thrones world and use their powers to vie for the Iron Throne. For example, they could use the Rinnegan's abilities to control minds, like the way the Red Woman in Game of Thrones uses her magic to influence people, but on a much larger scale.