Puss in Boots is often used in Shreck crossovers. His swashbuckling style and charm contrast with Shreck's ogre - like nature. Writers can create interesting storylines where they team up or compete against each other, perhaps in a world full of other talking animals from different stories.
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.
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.
Definitely Iron Man. Their relationship in the official Marvel movies has already been very popular, so in fanfiction, writers love to explore more of their interactions. Iron Man can provide high - tech support to Spider - Man, and they can have some really smart and witty conversations.
Definitely Ultraman. He is a well - known Japanese superhero, and when combined with Godzilla in fanfic, it creates a great mix of super - powered action. Also, Gamera is often crossed over with Godzilla. They are both giant turtle - like monsters in their own rights, and the crossovers usually involve some intense battles over who is the more powerful or dominant one.
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.
In Naruto - Scott Pilgrim fanfiction, Rock Lee is a character that many fans like to cross over. His unique fighting style based on pure hard work and determination would be really cool to see in the Scott Pilgrim universe. And from Scott Pilgrim's side, Wallace Wells could be a popular crossover character. His laid - back and sarcastic personality could create some humorous moments when interacting with the Naruto characters.
Probably Naruto himself would be a very popular character to cross over. His energetic and determined personality could bring a lot of action and drive to a crossover story. In Vampire Academy, Rose Hathaway could be another popular choice. She is strong - willed and a skilled fighter. When these two characters meet, there could be a great dynamic of them either competing or teaming up. Another popular character from Naruto that could be used is Sasuke. His brooding and powerful nature would contrast well with the vampires in Vampire Academy.
Definitely Naruto and Spider - Man. Naruto's energetic and determined nature combined with Spider - Man's quippy and heroic attitude makes for a great crossover. They could swap powers or team up to fight villains in both universes.
Pokémon characters are often seen in doraemon crossover fanfic. Pikachu could interact with Doraemon in many ways. Maybe Doraemon could use his Memory Bread to help Pikachu learn new moves faster. And Pikachu's electric powers could be used to power some of Doraemon's gadgets in case of a power outage.