One interesting concept could be a crossover with the Men in Black. Imagine the Ghostbusters teaming up with the MIB agents to deal with paranormal entities that are also of alien origin. They would have to combine their different technologies and ways of handling the supernatural and extraterrestrial.
Definitely Venkman. His sarcastic and witty personality can create great interactions in crossovers. For instance, if he were in a crossover with the X - Men, his humorous take on the mutants' powers would be hilarious.
In this fanfiction, the character development can be really fascinating. When the 'the real ghostbusters' cross over, they might face challenges that force them to grow in new ways. For instance, if they cross over into a world where the rules of physics are different when it comes to ghosts, they have to adapt quickly. And the relationships between the characters can change too. They might form new alliances or rivalries with characters from the crossover, which makes for an exciting read.
One idea could be that a portal between the Ghostbusters' New York and the Gargoyles' world has opened up. Ghosts start pouring into the Gargoyles' domain, causing all sorts of problems for them. The Gargoyles seek out the Ghostbusters for help. As they work together, they discover that there is a deeper mystery behind the portal's opening, something that ties into the ancient history of both their worlds.
Another plot could involve a crossover with 'Men in Black'. The two groups could initially be at odds as they deal with different types of 'paranormal' entities. But then they discover a common threat that is both extraterrestrial and ghost - like. They have to combine their resources, the Ghostbusters' knowledge of the spirit world and the Men in Black's expertise in dealing with aliens, to save the world from this new and dangerous entity.
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.
Well, it could be about the Ghostbusters getting called to a location that has the same kind of supernatural presence as in the Fatal Frame games. Maybe they find out that the ghosts there are different from what they usually deal with, more like the ones in Fatal Frame which are often tied to specific emotional traumas. They might have to use the technology from their world combined with some knowledge from the Fatal Frame universe to deal with the ghosts.
One possible fanfiction could be about a female Ghostbuster who has a unique power to communicate with ghosts on a deeper level. She uses this ability to not only bust ghosts but also to understand their motives and stories. For example, she might encounter a friendly ghost who was wrongly accused of being malicious and she tries to clear its name while still maintaining the balance between the living and the dead world.
The villains from 'the real ghostbusters' like Gozer or Vigo could play a big part. In a crossover, they might team up with villains from the other franchise, creating a more powerful and menacing force for the Ghostbusters to face. And let's not forget Janine. She could be involved in some administrative or behind - the - scenes role in the crossover, providing support to the Ghostbusters while also interacting with new characters.
Ray might be really excited to study the Gargoyles. He's always into the supernatural and they would be a whole new kind of 'creature' for him to learn about. Egon would be more interested in how their existence affects the spiritual and magical balance in their world. The Gargoyles' leader could be very protective of his clan and would need to be convinced that the Ghostbusters are trustworthy. There would be a lot of cultural differences between the two groups that they would have to navigate as they interact.