Another interesting crossover could be with Buffy the Vampire Slayer. Picture the Ghost Adventures guys arriving in Sunnydale and working with Buffy to figure out the supernatural happenings there. Maybe they help Buffy with some of the ghosts she has to deal with, while she teaches them a thing or two about combatting the forces of evil.
You can make it unique by changing the setting. Instead of the usual spooky locations in the US, set the crossover in an ancient castle in Europe. The Ghost Adventures crew would have to deal with different types of hauntings and superstitions.
One idea could be that the Ghost Adventures crew goes to Forks to investigate some strange paranormal activities that seem related to the vampires and werewolves in Twilight. Maybe they find out that some of the 'hauntings' are actually caused by the territorial disputes between the two supernatural groups.
Alice from Twilight could be a fascinating character to focus on. Her ability to see the future could play an interesting role in a crossover. She could either help or hinder the Ghost Adventures crew in their investigations. Maybe she sees something in the future that involves the ghosts and tries to prevent or encourage the crew's actions.
Common themes in 'Ghost Adventures Fanfiction Stories' include facing one's fears. The characters in the show are constantly in spooky situations, and fanfiction often plays on that by making them confront their deepest fears. Also, the idea of solving the mystery behind hauntings is very common. Writers like to create their own explanations for why a place is haunted and how the team can figure it out.
One common theme is the exploration of the unknown. Since the real 'Ghost Adventures' is all about investigating the paranormal, fanfiction often delves deeper into what might be hidden in those haunted places. Another theme is the bond between the crew members. Their relationships are often explored more in fanfiction, like how they support each other during scary situations.
Most of what's shown on Ghost Adventures is fictionalized. They use special effects and editing to make it seem more spooky and mysterious than it probably is in reality.
One common theme is the clash of different fighting styles. For example, when Jackie Chan crosses over with other action - based characters, their distinct ways of fighting create interesting battles. Another theme is the combination of different worlds' mythologies. If he crosses over with a fantasy - based world, their mythologies often merge.
Another idea for a Blue Exorcist Demon Tail fanfiction is a story centered around a character who has the powers of both an exorcist and a Fairy Tail mage. This character could be an outcast in both worlds, not fully accepted by the exorcist community because of their magic and not fully trusted by the Fairy Tail guild because of their connection to demons. They would have to find their own path and prove their worth in a world full of prejudice.
A crossover with a superhero universe would be cool. Imagine Pokémon in a city full of superheroes. Charizard could team up with a fire - based superhero to fight a powerful villain. The Pokémon's unique abilities would add a new dynamic to the superhero battles.