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.
A crossover with The Haunting of Hill House might also be cool. The two teams could explore the haunted house together. The characters from The Haunting of Hill House could share their emotional experiences with the Ghost Adventures crew, and they could all try to find a way to put the restless spirits to rest.
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.
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.
One idea could be an OC who has a special ability to communicate with spirits on a different frequency than the Ghost Adventures crew. For example, they can hear the spirits' true intentions while the crew only picks up on the more surface - level hauntings. This could lead to some tense moments where the OC has to convince the crew of what's really going on.
Maybe in the fanfiction, the Pokemon from the anime start showing up in the adventures manga world. This causes a stir as the trainers in the manga world have to figure out how to handle these new and different Pokemon. It could lead to some interesting battles and friendships. For example, Pikachu could meet a really rare and powerful Pokemon from the manga world and they could form an unexpected alliance.
One idea could be a crossover with another DC hero like Superman. Batman and Superman could team up to face a new, powerful villain that neither could defeat alone. Maybe this villain has the ability to manipulate Gotham's underworld and also poses a threat to Metropolis.
One idea could be a crossover with Blade Runner. You could explore how the concepts of identity in both universes interact. The replicants' search for more 'human' experiences and the cyborgs in Ghost in the Shell's exploration of their own humanity would make for a really thought - provoking story.
A possible plot is that the Ghost Rider's hellfire has an unexpected effect on the vampires in Twilight. Since vampires are undead, the hellfire might either have no effect, or it could be the one thing that can truly destroy them. This could lead to a race between the vampires and the werewolves to either use or stop the Ghost Rider. Also, the Ghost Rider could form an alliance with the werewolves as they are more in tune with the natural order which the Ghost Rider also represents in a way.
A crossover with Kamen Rider Zi - O could also be really cool. Zi - O travels through time, so he could accidentally disrupt the timeline in a way that affects Ghost's world. Ghost might have to team up with Zi - O to fix the timeline while also dealing with the enemies that are taking advantage of the time - chaos. They could encounter different versions of themselves from alternate timelines and have to figure out how to make things right.
Another interesting story could be a crossover with 'One Piece'. Ghost Rider could end up on the Grand Line and join the Straw Hat Pirates. His powers could help them in their adventures, especially against powerful foes like the Yonko. He could also have some interesting interactions with Luffy and the crew due to his dark and serious nature.
One idea could be that the characters from SAO find themselves in the world of Ghost in the Shell. They have to adapt to the high - tech environment where cybernetic enhancements are common. Kirito could use his sword - fighting skills in a new context against cybernetic foes.