A character like Mia could work well. Mia is a tech - savvy OC. She uses her gadgets to help Seth and herself navigate through the dangerous areas around Witch Mountain. Her intelligence and quick - thinking complement Seth's more intuitive approach.
The OC could be a journalist investigating the mysteries of Witch Mountain. Seth, who already has some knowledge about it, reluctantly teams up with the OC. As they explore, they find that their destinies are intertwined more than they thought, leading to a thrilling and emotional journey.
Maybe an OC that is a young alien from a different planet than the ones in the movie. This OC could be trying to find a way back home while also having to deal with the chaos around Witch Mountain. They could form an unexpected alliance with the human characters and together face the various threats in the story. It would add a new dynamic to the existing plot.
Create a complex backstory for your OC that ties into the lore of 'Race to Witch Mountain'. Explain how they got to where they are in the story and what their past experiences have been. Maybe they have a connection to the mountain that no one else does. Also, try to write in a style that is different from the usual fanfiction. Use vivid descriptions and engaging dialogue to draw the reader in.
One of the things that make this type of fanfiction unique is the exploration of relationships. You have three established characters in Dean, Seth, and Roman, and then you introduce an OC. How the OC fits into their group, whether they become friends, lovers, or foes, and how their presence affects the pre - existing relationships among the three men. It allows for a lot of creativity in terms of character arcs and plot development. For instance, in some fanfictions, the OC's presence might cause a rift between Dean and Seth at first, but then they all learn to work together and grow as a result of it.
There's 'A New Chapter'. This fanfiction focuses on how the OC, who is a journalist, gets involved with Dean, Seth, and Roman's lives. The story is interesting as it shows the behind - the - scenes of their wrestling world from an outsider's perspective. The relationships between the characters are complex and keep you hooked throughout.
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.
I read a 'race to witch mountain fanfiction' that focused on the relationship between the main characters after they left Witch Mountain. It was a heart - warming story that explored their growth and how they dealt with normal life after such an extraordinary adventure.