One interesting crossover could be the characters from both universes meeting in a magical realm. For example, Aragorn from 'Lord of the Rings' and Jon Snow from 'Game of Thrones' might team up to fight a common enemy like a powerful dark wizard. Their different combat styles and leadership qualities would make for an exciting story.
In terms of themes, both RWBY and Lord of the Rings deal with the fight against evil. In a fanfiction, the characters could team up to face a greater evil that threatens both their worlds. The Fellowship's journey to destroy the One Ring could be paralleled with Team RWBY's adventures to stop Salem. The idea of friendship, sacrifice, and hope are common in both, and a fanfiction could expand on how the characters from different universes interact based on these themes.
Another cool crossover could be Aragorn and Harry Potter meeting. Aragorn, with his leadership skills and combat experience, could teach Harry some things about leading in a more traditional, non - magical way. Harry, in turn, could show Aragorn the power of magic. They could form an alliance to fight against common enemies like Sauron's forces and Voldemort's Death Eaters.
One interesting crossover could be the Avengers having to deal with the political intrigue of Westeros. For example, Iron Man might use his technology to try and outwit the various lords vying for the Iron Throne, much like he does with his corporate rivals. Another could be Thor interacting with the gods in the Game of Thrones universe, perhaps recognizing some similarities between their powers.
One interesting crossover could be a scenario where the powerful vampires from The Originals find themselves in the political intrigue of Westeros from Game of Thrones. Maybe they get involved in the power struggles between the different houses, using their vampiric abilities to gain an edge. For example, Klaus Mikaelson could try to manipulate Cersei Lannister for his own ends.
A really cool fanfiction idea could be that the ancient prophecies in both Eragon and Game of Thrones are somehow related. Characters from both stories start to realize that their fates are intertwined due to these prophecies. This could lead to a grand adventure where they have to work together to fulfill or prevent the prophecies from coming true. For instance, Daenerys Targaryen and Eragon could join forces, with their dragons, to face a great evil that has been foretold in both of their worlds' prophecies.
A great crossover idea in the fanfiction could be the magic systems. Imagine Daenerys Targaryen learning about the Signs that Geralt uses. Her dragons could be intrigued by the magic of The Witcher world, and perhaps they could interact in ways that are both unexpected and exciting. This could lead to new alliances or battles depending on how the story unfolds.
One interesting crossover could be the use of Aquaman's underwater kingdom's politics and apply it to the power struggles in Game of Thrones. For example, the complex hierarchies and rivalries among different underwater tribes in Aquaman's world might mirror the Houses vying for the Iron Throne. Another could be a character from Game of Thrones finding themselves in Aquaman's world and having to adapt to the underwater environment and its rules.
One interesting crossover could be a scenario where the Mandalorian's combat skills are put to use in the political intrigue of Westeros. Maybe he's hired as a bodyguard for a powerful lord or lady, and his no - nonsense approach disrupts the usual scheming. For example, when faced with the Littlefinger - like characters, his straightforwardness would be a contrast to their devious ways.
One interesting crossover could be the combat styles. The Spartans' disciplined and fearless fighting in 'Spartan 300' could be incorporated into the battles of 'Game of Thrones'. For example, imagine the Unsullied being trained in Spartan - like combat formations. Another aspect could be the political intrigue. The complex power plays in 'Game of Thrones' combined with the Spartan's sense of honor and duty in their city - state politics.
Well, for 'Game of Thrones crossovers fanfiction', a cool one would be to cross it with 'The Chronicles of Narnia'. Imagine Arya Stark finding her way into Narnia and becoming part of the fight against the White Witch. Also, a crossover with 'Sherlock Holmes'. The detective skills of Sherlock could be applied to solving the mysteries and political intrigues in Westeros. And a crossover with 'The Hunger Games', where the citizens of the Seven Kingdoms are forced to participate in a similar brutal game.