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.
It's possible that a powerful sorcerer or witch in Game of Thrones accidentally summons Tom Riddle while performing a complex spell. Riddle, seeing the chaos and opportunity for power in Westeros, decides to stay. He could then use his knowledge of magic and his cunning to insert himself into the political intrigue. For example, he might side with a claimant to the Iron Throne and use his magic to eliminate opponents, all while trying to gain more power for himself in this new and unfamiliar world.
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.
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 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.
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.
One way could be through a magical portal. Imagine in a fanfic, a powerful mage in the Game of Thrones world accidentally opens a portal to the Naruto universe. Dark Naruto, with his edgy and powerful nature, could be seen as a threat similar to some of the dark forces in Game of Thrones. He might form an alliance with a power - hungry lord in Westeros, thinking he can use their resources to achieve his own goals in the Naruto world. For example, if he teams up with Littlefinger, they could plot to take over both kingdoms using Dark Naruto's powers and Littlefinger's cunning.
They could intersect in a dream - like scenario. A character in Game of Thrones, perhaps a Targaryen with their prophetic dreams, dreams of Darth Vader. This could be a sign of an impending doom or a new power rising. In the Star Wars universe, Vader has dreams and visions as well. Maybe their dreamscapes merge, and they communicate in this ethereal realm, sharing knowledge and perhaps even influencing each other's destinies in their respective universes.
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, Goku could enter the Game of Thrones world during one of his training sessions where he accidentally travels through dimensions. In this new world, he would find the concept of the Iron Throne and the power struggle very strange. But his nature would make him oppose tyrants like Joffrey. He might start his own 'Saiyan - style' kingdom where strength and honor are the main values. His interactions with characters like Tyrion would be interesting, as Tyrion is a smart strategist and could potentially learn from Goku's combat skills while Goku could learn about the complex politics from Tyrion.
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 to blend the two universes could be through character crossovers. For example, imagine a Pokemon trainer like Ash in the world of Westeros. He could use his Pokemon to help in battles or in diplomatic situations. His Pikachu's electric attacks could be used as a weapon or a deterrent in the political power plays of the Seven Kingdoms. Another aspect could be the introduction of Pokemon into the Game of Thrones ecosystem. Maybe some Pokemon could be native to certain regions of Westeros, like ice - type Pokemon in the North. This would add a new layer of complexity to the already rich lore of Game of Thrones.