Definitely Tyrion Lannister. In a crossover with 'The Simpsons', he could bring his sharp wit and political acumen to Springfield. He'd probably outwit Mr. Burns in no time. His complex personality and ability to adapt would make for a very engaging character in such a crossover fanfiction.
Daenerys Targaryen would be a fascinating choice. In a crossover with 'Avatar: The Last Airbender', she could learn bending techniques and use them to her advantage. Her dragon - riding skills and her quest for the throne could be intertwined with the Avatar's world, creating a really unique and exciting story.
Daenerys Targaryen would be fascinating. She has her own dragons, but Lightbringer could be the key to truly uniting the people of Westeros under her rule. It could symbolize her rightful claim to the Iron Throne and be a tool to overcome any remaining opposition.
Arya Stark would be a great choice. She's already a skilled fighter in the ways of the Faceless Men. Training with samurai could enhance her skills even further. Her journey of self - discovery could be influenced by samurai teachings about honor and discipline.
Well, Daenerys Targaryen is often a popular choice. Her dragons and her journey of reclaiming the Iron Throne can be easily adapted into crossovers. For example, if she were to cross into a world full of magic - users, how would she use her power? Also, Jaime Lannister is quite popular. His character arc from a seemingly villainous knight to a more complex figure can be explored in different settings. In a crossover with a historical setting, his knightly skills and code of honor (or lack thereof at times) would be very interesting to play with.
Jon Snow would be an interesting character to be an avatar. Given his complex backstory and his role in the fight against the White Walkers, as an avatar he could gain even more powerful abilities. Maybe he could have the power to control the elements, which would be a huge advantage in battles. He could use this to create blizzards against the White Walkers or to put out fires during the sack of King's Landing.
Jon Snow would also be a great addition. His journey from being a bastard to a leader in Game of Thrones could be paralleled in the world of Frozen. He could learn from Elsa about controlling his powers (if we assume he has some new ice - related powers in this crossover) and in turn, teach the people of Arendelle about loyalty and sacrifice, which are values he has held dear in Westeros.
Arya Stark in a 'Naruto Game of Thrones crossover fanfiction' would be fascinating. If she were to learn some of Naruto's ninja skills, she would become an even deadlier assassin. And Naruto's influence might change her path a bit, making her less vengeful and more about bringing real change to Westeros.
Black Widow. She's a master spy and assassin. In the world of Game of Thrones, she could easily blend in with the various spies and informants. She could play the game of thrones better than most of the characters there, using her charm and combat skills to manipulate the situation to her advantage. She might even be able to uncover some of the deepest secrets of the Seven Kingdoms.
Stormbreaker itself could be considered a character in a sense. If it were to appear in the Game of Thrones world, it would be an object of great power. Many characters would vie for it. It could end up in the hands of someone like Daenerys, who already has a connection to powerful and magical things. This would make her even more of a dominant force in the story.
First, think about the characters. For example, imagine Jon Snow in the world of Aladdin. He could be a wandering swordsman in the streets of Agrabah. Then, consider the plot. Maybe there's a quest for a magical object that both worlds believe in. Combine the political intrigue of Game of Thrones with the magical elements of Aladdin. For instance, the power struggle for the lamp in Aladdin could be like the fight for the Iron Throne.
One interesting concept could be a crossover with another fantasy world like Middle - earth. Imagine characters from Game of Thrones meeting hobbits or elves. Another concept might be a crossover with a historical setting, such as the Roman Empire. It would be fascinating to see how the power struggles in Westeros compare to those in ancient Rome. Also, a crossover with a superhero universe could be really cool, like if Daenerys had superpowers or Jon Snow could fly like Superman.