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.
One great 'Lord of the Rings and Game of Thrones Fanfiction' is 'The Convergence of Westeros and Middle - earth'. It combines the magic systems of both in an interesting way, like how the One Ring could interact with the magic in Westeros.
I really like the fanfic 'A Song of Rings'. In this story, the One Ring somehow finds its way to Westeros. The author does an amazing job of integrating the different lore. For example, how the power of the ring affects the power - hungry characters in 'Game of Thrones' is fascinating. It also shows how the characters from Middle - earth would react to the more brutal world of Westeros.
The 'forbidden love' trope can be really engaging. Imagine a love story between a character from 'Game of Thrones' and one from 'Lord of the Rings' in a crossover fanfiction. This trope can create a lot of conflict and emotional depth. And the 'rag - to - riches' or 'rise to power' trope is also seen a lot, as it shows the character's growth and transformation.
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.
The biggest challenge is probably the different magic systems. In 'Lord of the Rings', magic is more ethereal and associated with certain races. In 'Game of Thrones', it's more of a mysterious and often dark force. Combining these two concepts without making it seem forced can be difficult.
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.