Who are some characters that could be added to a Billy and Mandy crossover fanfiction?

Hermione Granger from the 'Harry Potter' series could be an interesting addition. She could use her magic knowledge to help the Ghostbusters understand the more esoteric aspects of the ghosts they're dealing with. Maybe she could even develop spells that work in tandem with the Ghostbusters' technology.

A possible plot for Billy and Mandy crossover fanfiction is that they end up in a world of magic school. Billy is completely clueless about magic at first and keeps causing chaos in the classes. Mandy, on the other hand, is intrigued by the different types of magic and tries to learn as much as she can. They get involved in a competition between different houses in the school, and their friendship is tested as they face various challenges and temptations during the competition.

In a crossover with 'Star Wars', Luke Skywalker could be a great addition. He could teach the boys about the Force and they could go on a mini adventure together. Also, Princess Leia could be added. She could bring her leadership and strong - willed nature to the group. They could all work together to fight off some Imperial threats that somehow end up in their world.

In a crossover with 'Final Fantasy', Cloud Strife could be added. He is a skilled warrior with a cool sword. He could join Spyro in his adventures and offer his combat skills against powerful enemies. Their different fighting styles, Spyro's magic and flight and Cloud's swordsmanship, would make for an interesting dynamic.

The Doctor from 'Doctor Who' would also be a great addition. With his time - traveling TARDIS, he could bring the characters of Journey to the West to different time periods and planets. He could also help them with his vast knowledge and advanced technology when they face difficult situations, like when they need to break a powerful spell that is beyond their normal capabilities.

The main characters are Billy and Mandy, of course. Billy is usually portrayed as a not - so - bright but kind - hearted boy, and Mandy is a rather tough - minded and often cynical girl.

Well, obviously Billy and Mandy are the main characters. Billy is often the goofy and naive one, while Mandy is more cynical and in control.

A young journalist could be added. He's eager to make a name for himself by getting the inside scoop on Billy the Kid. He follows Billy around, trying to interview him and in the process, gets caught up in the dangerous world of the outlaws.

Billy and Mandy themselves are obviously very popular. Fans love to write about their adventures and how they interact with each other. Grim is also a key character that often features prominently. His role as a sort of guide or mediator in their crazy world is always interesting to explore in fanfiction.

Sherlock Holmes could be an interesting addition. His deductive skills would complement the spy work of the U.N.C.L.E. agents. He could help them solve complex mysteries and outwit their enemies with his brilliant mind.