Jon Snow is another character that is often used in these crossovers. His sense of honor and his journey from being an outcast to a leader could be interestingly juxtaposed with Aquaman's own story. Maybe he could learn something from Aquaman about ruling a kingdom or vice versa.
Aquaman himself is often a popular choice. His unique abilities and his role as a king make him an interesting character to insert into the Game of Thrones universe. He could potentially interact with various characters in Westeros.
Ciri and Daenerys Targaryen. Ciri has magical powers and is a strong female character. Daenerys has her dragons and is a powerful leader. They could meet and form an alliance. Ciri might be interested in Daenerys' dragons and Daenerys could be intrigued by Ciri's magic. Together they could change the power dynamics in a fanfiction world.
Daenerys Targaryen is often a popular choice. Her strong - willed and powerful nature makes her an interesting character to insert into the Harry Potter universe. She could potentially be a powerful witch or have some sort of unique connection to magic. Another popular one is Tyrion Lannister. His intelligence and wit would make him a great addition to Hogwarts. He could be a student who uses his cunning to solve magical mysteries.
Definitely Ragnar and Tyrion. Ragnar is a fierce and intelligent Viking leader, and Tyrion is a clever and witty character in Game of Thrones. Their interactions would be full of banter and strategic planning. They could both learn a lot from each other's ways of dealing with power and politics.
Jon Snow is often still a very popular character. His story of being a bastard and his true heritage make him an interesting figure. In fanfiction, he might get to explore his role as a potential king or leader in different ways than in the original series.
Fiona is also a top choice. Her relationship with Shreck in the movies gives a lot of material for crossovers. Fanfiction writers might explore how she and Shreck interact in different universes or scenarios, like in a world where they are not in the same fairytale but a different, more modern world.
Jon Snow is very popular. He has a complex backstory and his character arc in the original series leaves a lot of room for fanfiction exploration. Fans often write about his life after the events of the show, or they create alternate scenarios for his journey. Daenerys Targaryen is also a favorite. Her dragon - riding and her quest for the Iron Throne make for exciting fanfiction material.
Sherlock Holmes is also quite popular. Holmes' deductive skills against Darth Vader's power in the Force would make for an exciting story. Holmes could be trying to figure out Vader's motives and secrets, while Vader might see Holmes as a nuisance or a potential ally depending on the situation.
Ben 10 is a favorite for many. As I said before, the clash between Johnny's human - centered confidence and Ben's alien - powered abilities is exciting. Also, characters like Dexter from Dexter's Laboratory are often used. The scientific genius of Dexter and the not - so - smart Johnny can lead to hilarious and complex stories. Courage the Cowardly Dog is also a great choice as the spooky and strange world Courage lives in can be a great backdrop for Johnny's adventures.
Definitely Bell Cranel. If he is crossed over into the Naruto world, his growth as an adventurer in Danmachi can be compared to the growth of a ninja in Naruto. His determination to become stronger is similar to Naruto's. Also, Ais Wallenstein is popular. Her combat skills and beauty would make for an interesting combination in the Naruto universe, perhaps having epic battles with Naruto's strong female characters like Tsunade.
Thor is often crossed over with the Hulk. They already have a history in the official comics with their epic battles. In fanfiction, it could be about them teaming up more often or having to face a threat that only their combined powers can defeat, like a powerful cosmic entity.