Characters from 'Teenage Mutant Ninja Turtles' could be great. Imagine the Ducks and the Turtles teaming up to fight a common foe in the streets of New York. The Turtles' martial arts skills combined with the Ducks' hockey moves would make for an exciting story.
How about characters from 'Scooby - Doo'? The gang could be investigating a mystery at the Ducks' hockey rink. The Ducks could help Scooby and the gang solve the mystery while also showing off their hockey skills. It would be a fun combination of mystery - solving and sports action.
The Powerpuff Girls could be interesting crossover characters. The Ducks might visit Townsville and get involved in one of the Powerpuff Girls' battles against evil. The girls' superpowers and the Ducks' teamwork on the ice could create a unique dynamic.
Maybe a crossover with a fantasy - themed cartoon. The Mighty Ducks enter a magical world where they have to use their hockey skills in a whole new way. For example, they might play hockey on floating ice rinks in a land of wizards and dragons. They could also team up with the local characters to defeat a common enemy that threatens both their worlds.
Another option is that the father is an old rival from another hockey team. Mallory had a brief encounter with him during a tournament, and it led to her pregnancy. This would add a whole new layer of drama as she has to deal with her pregnancy, her relationship with the Mighty Ducks, and the potential fallout from the rival team finding out.
One potential crossover character could be Harry Potter. Imagine Naruto, with his immortality, meeting Harry in the wizarding world. Naruto could teach Harry some ninja skills, and they could fight together against Voldemort. Another could be Superman. The contrast between Superman's superpowers and Naruto's ninja skills, along with Naruto's immortality, would make for an interesting story.
Maybe Naruto from Naruto could be a crossover character. His ninja skills and Ichigo's combat abilities could create some unique fight scenes. Also, their different ideologies about friendship and power could lead to some great character interactions.
Solid Snake is an obvious choice. Since they are from the same general franchise, their encounter could be filled with a lot of drama and action. They could have different views on how to handle certain situations, which would create great story tension.
King Kong would be an obvious choice. The epic battles between Godzilla and King Kong are well - known, and a fanfiction could explore different scenarios of their encounters, like what if they had to team up against a greater threat.
One potential crossover character could be Goku from Dragon Ball. Since Naruto has godlike powers in this scenario, a meeting with Goku, who also has superhuman strength and abilities, would be very interesting. They could have a friendly sparring match or team up against a common enemy.
Goku from Dragon Ball could be a great crossover character. His Saiyan powers and love for combat could contrast and interact in an interesting way with Naruto's ninja skills and immortal sage abilities. They could have epic battles or team up against a common enemy.
Definitely Sherlock Holmes. Since The Great Mouse Detective is inspired by Sherlock Holmes, a crossover with the original Holmes would be very interesting. They could compare and contrast their detective methods.
Well, if we consider other shonen - style series, someone like Naruto from 'Naruto' could be a potential crossover character. His ninja skills and strong will could create some interesting dynamics with the 'world trigger' characters.