One interesting character could be Harry Potter. Imagine Astolfo in the wizarding world, with his magical abilities and flamboyant style. He could befriend the Gryffindor students and have adventures in Hogwarts. Another is Naruto. Astolfo could cross paths with Naruto in the ninja world, and their different fighting styles would make for an exciting encounter. Also, Sherlock Holmes. Astolfo might assist Holmes in solving a mystery in Victorian London, bringing his own unique perspective to the case.
Well, in fanfiction, Astolfo could cross over with Alucard from Hellsing. The contrast between Astolfo's more light - hearted nature and Alucard's dark and brooding presence would be fascinating. They could either be enemies or reluctantly team up. Another character is Link from The Legend of Zelda. Astolfo could join Link on his quest to save Hyrule, adding his own skills to the mix. Also, he might cross over with Sailor Moon. The magical girl aspect of Sailor Moon and Astolfo's own magic could lead to some great storylines, like fighting a common enemy together.
Luke Skywalker and Amuro Ray would make an interesting crossover. Luke's Jedi skills and Amuro's Gundam piloting abilities could lead to some great action scenes. They could learn from each other, like Luke teaching Amuro about the Force and Amuro showing Luke the ins and outs of Gundam technology.
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.
Another interesting pair could be Nick Wilde from Zootopia and Erin Reagan from Blue Bloods. Nick is a sly fox with a lot of street smarts, while Erin is a tough prosecutor. Their personalities would clash and also complement each other in an interesting way in a fanfiction. They could be involved in a case that spans both their worlds, with Nick using his charm and Erin using her legal knowledge to get to the bottom of things.
The main characters are obviously Naruto and Astolfo. Naruto, a ninja from the Hidden Leaf Village, known for his determination and powerful jutsu. And Astolfo, a character from the Fate series, who is a heroic spirit with his own set of magical abilities and a rather unique personality.
For 'rwby cross over fanfiction', a cool concept would be a crossover with the world of Attack on Titan. The RWBY teams could be part of the fight against the Titans, using their unique weapons and semblances. It would also be interesting to see a RWBY and My Hero Academia crossover. The RWBY characters could interact with the students at UA High, sharing their experiences of being heroes. Additionally, a RWBY and Naruto crossover, where they learn about each other's ninja and huntsman skills.
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.
One interesting character to cross over with Iron Man is Wolverine. Wolverine's rough - and - tumble nature and his healing factor would be a great contrast to Iron Man's high - tech gadgets. Black Widow could also be a great addition. Her spy skills and combat abilities would add a new dimension to the story. And Hulk, the big green behemoth, would be a force to be reckoned with, and the interaction between him and Iron Man would be full of drama.
In a Naruto - Warhammer 40k crossover fanfiction, Gaara could be a fascinating character to cross over. His control over sand and his past of being an outcast could be relatable to some of the mutants or psykers in the 40k universe who are also often ostracized. From Warhammer 40k, an Eldar Farseer would be an interesting choice. Their psychic abilities and their long - lived, mysterious nature could create some really complex and engaging interactions with the characters from Naruto's world, especially those with their own unique powers like Naruto and Sasuke.
Hermione is a prime candidate for an interesting crossover. In an anime world like My Hero Academia, she could use her intelligence and magic to attend U.A. High School. She'd be a unique student, using spells instead of quirks, and could help solve some of the complex problems in that world. Ron Weasley could also be fun. If he crossed over into the world of Inuyasha, he could bring his sense of humor and his skills with magic items. He might accidentally cause some chaos with his clumsy ways, but also be a valuable ally in the fight against Naraku. And then there's Luna Lovegood. In an anime like Spirited Away, her dreamy and eccentric nature could fit right in as she explores the strange spirit world, using her unique magic and knowledge of the wizarding world's odd creatures.
I think Jack Sparrow from 'Pirates of the Caribbean' would be really cool to cross over with Hercules. Jack's wily and unpredictable nature would contrast with Hercules' more straightforward heroism. They could be on a quest for a magical artifact that has the power to either save or destroy the world. It would be full of adventure, humor, and unexpected twists.