If we consider a crossover with One Piece, Luffy would be an excellent character to include. His stretchy powers and fearless attitude could add a lot of humor and action. Another good choice could be Batman from the DC universe. His detective skills and gadgets could be useful in a Dinosaur King crossover. Also, Sonic the Hedgehog. His speed could be an interesting contrast to the slow - moving but powerful dinosaurs.
In a crossover with Naruto, Naruto himself would be a great addition. His determination and unique jutsu could blend well with the Dinosaur King story. Also, Goku from Dragon Ball Z. His super strength and ability to transform would make for an exciting combination. And Pikachu from Pokémon, it would be fun to see how a small electric Pokémon interacts with the big dinosaurs.
In a Dorohedoro crossover with 'One Punch Man', Saitama would be an interesting addition. His overpowered nature would contrast with the often - more - gritty and complex power levels in Dorohedoro. Another good character could be Guts from 'Berserk'. His dark and brooding personality would fit well in Dorohedoro's gloomy atmosphere. Also, Edward Elric from 'Fullmetal Alchemist' could bring his knowledge of alchemy and his quest for truth to the Dorohedoro world.
In vegito crossover fanfiction, characters like Jiren would be great. His strength and stoic nature would make for some intense interactions with Vegito. Also, Android 18 could be included. She has her own unique set of powers and a strong will. Her presence could add some interesting dynamics, especially if she has to team up with Vegito against a common enemy. And don't forget Frieza. His evil nature and thirst for power always make for an exciting addition to any Dragon Ball - related story.
Kenny McCormick (Mysterion) could cross paths with Batman. Batman's detective skills and high - tech gadgets would make for an interesting dynamic with Mysterion's more 'underground' superhero style. They could work together to solve a mystery that spans Gotham City and South Park.
For a crossover with Doctor Who, the Doctor could be an interesting addition. He could bring his time - traveling abilities and vast knowledge to the Shadow World. And from the Shadowhunter side, Jace Wayland would be a good character to include. His charm and combat skills would make for some interesting dynamics with characters from other universes.
For a crossover with a post - apocalyptic world, characters like Mad Max could be involved. He might see the homunculi as either allies or threats in the harsh new world. In a crossover with a cyberpunk world, characters like Neo from 'The Matrix' could be interesting. The homunculi could be part of the complex digital and physical world that Neo navigates, and he could help them understand the true nature of their existence in this new, high - tech world.
In a springtrap crossover fanfiction, characters like the Purple Guy could be included. Since he has a connection to Springtrap, it would make for an interesting story. You could also include some original characters, like a brave adventurer who tries to stop Springtrap. And perhaps a mad scientist who created or is trying to control Springtrap.
The Powerpuff Girls would be great. Unikitty could join forces with them to fight crime in Townsville. Her magical powers combined with the girls' superpowers would make for an unbeatable team.
Well, if you're doing a crossover with "The Wizard of Oz", Dorothy would be a great addition. She and Coraline could compare their experiences of strange new worlds. The Scarecrow, Tin Man, and Cowardly Lion could also add some interesting dynamics, like the Scarecrow's new perspective on Coraline's world and how different it is from Oz.
If you're doing a crossover with 'Attack on Titan', Eren Yeager would be interesting. His determination to fight Titans could be combined with Negi's mission to protect his students. Mikasa, with her combat skills, would also be a great addition. And in a crossover with 'My Hero Academia', Deku's growth as a hero could be paralleled with Negi's growth as a teacher and mage.
You could also include Ultraman. Ultraman's high - tech powers and Mothra's natural, almost mystical powers would create a great contrast. They could learn from each other and fight side by side against a horde of invading space monsters.