Who are some potential characters that could be added in a 'Race to Witch Mountain Crossover Fanfiction'?

Luffy from One Piece could also be a great addition. His carefree yet strong - willed nature would create some fun dynamics. He might be amazed by the Air Gear skating and try to incorporate it into his own fighting style on the Grand Line. Plus, his rubber body could lead to some really unique skating stunts.

A character with the power of wind could be added. This character could help Sharkboy and Lavagirl in their adventures by providing fast transportation or creating powerful gusts to fend off enemies. For example, when they are facing a horde of flying creatures, the wind - powered character could blow them away.

One idea could be a crossover with another Disney adventure movie like 'Pirates of the Caribbean'. The characters from 'Race to Witch Mountain' could end up on a pirate ship while trying to escape some new threat related to their original mission. Maybe the aliens from Witch Mountain have some sort of power that the pirates are after.

An American wizard detective. He could be investigating strange magical happenings in the wizarding world of America. The Potter character could cross paths with him and end up teaming up to solve a big case.

A young and curious wizard could be added. This wizard could be intrigued by the devil's unbreakable nature and try to study it, leading to some interesting interactions. Another character could be an angel who has lost its way and forms a strange bond with the devil. Or perhaps a talking animal, like a raven, that serves as the devil's confidant and gives it advice from a different perspective.

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 mysterious old Pokemon trainer who has a lot of knowledge about ancient Pokemon moves. He could guide Rusty on his journey.

An old mountain man who has been living in a different part of the mountain for decades. He could be a bit of a mystery at first, with his own set of rules and traditions. Sam could meet him during one of his explorations and they could share stories of their experiences in the wilderness. The old man could also teach Sam some ancient survival techniques that have been passed down through generations.

A group of nomadic mice. They have different skills and traditions compared to the Redwall mice. Their arrival at the abbey could cause some cultural clashes at first, but eventually, they could learn from each other and contribute to the abbey's growth. This would add more diversity to the characters in the fanfiction.

A young stargazer from Earth could be a new character. This character could be someone who has always been fascinated by the stars and dreams of traveling to other planets. When the Little Prince lands on Earth again, they meet and the stargazer becomes his guide on Earth, showing him all the new things that have happened since his last visit. Another potential character could be a talking moonbeam. It could offer the Little Prince advice and wisdom, as well as some magical abilities to help him on his journey.