The characters could also be a point of combination. A Viking-esque character in the 'Game of Thrones' universe. He could be a fierce warrior, perhaps with a different code of honor compared to the knights and lords of Westeros. This character could form alliances or rivalries based on his own values, and his presence would add a new dynamic to the story.
Another aspect is the mythology. Vikings had their own rich mythology, and in a fanfic, elements of this could be blended with the magic and superstitions in 'Game of Thrones'. For instance, the Norse gods could have an influence on the events in Westeros, or their magic could be a new force that the characters have to deal with.
One way to combine them could be in the setting. Imagine a story where the political intrigue of 'Game of Thrones' meets the raiding and exploration culture of the Vikings. For example, a Viking-like tribe could be inserted into the complex power struggles of Westeros. They might bring their own combat styles and beliefs, which would disrupt the existing order in the kingdoms.
One way they could be combined is by having a character from Game of Thrones be transported into the world of a US Navy destroyer. For example, a character like Jon Snow could find himself on the ship, perhaps through some magical portal. He would then have to adapt to the modern military environment, with all its technology and rules. This could lead to interesting scenarios where his combat skills from Westeros are put to the test in a different context.
One way they can be combined is through exploring the themes of morality. In 'Game of Thrones', there are complex moral situations, much like in Christianity where moral teachings are central. For example, a fanfiction could focus on a character like Jon Snow and draw parallels to the Christian concept of sacrifice. Jon Snow often makes selfless decisions for the greater good, similar to the sacrifice of Jesus in the Christian faith.
Well, in a Naruto - Game of Thrones fanfiction, you could have the Sharingan (from Naruto) be a rare and mysterious power in the Game of Thrones world. Maybe a character discovers they have this power and it's seen as a sign from the gods. And then, just like in Naruto, there are different levels of power associated with it. This could lead to new alliances being formed as houses try to either control or protect the person with the Sharingan.
One way they could be combined is by having Aquaman's underwater world interact with the political intrigue of Westeros. Maybe the Iron Throne is made of some sort of magical material that has an effect on the seas, and Aquaman has to come to the surface world to deal with it. He could use his powers to navigate the complex power struggles, much like he does in his own underwater kingdom.
A plot where Vikings raid the Iron Islands and form an alliance with Euron Greyjoy. They could then together plan to conquer the other kingdoms. The Vikings' seafaring skills combined with Euron's knowledge of Westeros would make for a very powerful force.
One way to combine them creatively could be to have the bending abilities from Avatar in the world of Game of Thrones. For example, a waterbender could use their skills in the battles near the sea or a river in Westeros. They could freeze the water to create barriers or use water whips against the enemy. Another idea is to have the political intrigue of Game of Thrones play out among the different nations in the Avatar world. The power struggles between the Fire Nation, Earth Kingdom, Water Tribes and Air Nomads could be intensified with the addition of the complex political strategies seen in Game of Thrones.
The theme of sacrifice is present in both works. The Spartans sacrifice themselves for the greater good of their people. In 'Game of Thrones', characters like Ned Stark sacrifice themselves for their families or beliefs. Fanfiction could create scenarios where characters from both worlds have to make similar sacrifices. For example, a character from 'Game of Thrones' might sacrifice their claim to the Iron Throne to save the realm, much like the Spartans sacrificed their lives to protect their homeland. This could lead to new character developments and plot twists.
One way to combine Mortal Kombat and Game of Thrones in fanfiction could be through character crossovers. For example, imagine a scenario where Jon Snow has to face off against Scorpion in a battle. The harsh, wintry landscapes of Westeros could serve as a backdrop for Mortal Kombat - style duels. Another aspect could be the integration of the power systems. In Game of Thrones, there are different forms of magic like that of the Red Priests. In Mortal Kombat, there are the special moves and powers of the fighters. Fanfiction could explore how a character from Game of Thrones might adapt to or use the powers and fighting styles of Mortal Kombat.
One way to combine the settings is to have a portal open between Westeros and Middle - earth. Maybe a powerful wizard in 'Lotr' accidentally creates a gateway while experimenting with magic. Through this portal, characters from both worlds can pass and interact. For example, Aragorn could enter Westeros and help in the fight against the White Walkers, or Tyrion Lannister could end up in Minas Tirith and use his wits to deal with the politics there.
One way could be to have a world where the power struggles similar to 'Game of Thrones' exist within a police department. Different factions vying for control, with backstabbing and political intrigue just like in the Seven Kingdoms.