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.
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.
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.
Maybe the Gargoyles get accidentally transported to Bonkers' world. And they have to find a way back while dealing with all the chaos there.
One idea could be that the Ghostbusters discover a new type of ghost that can possess technology. So they have to find a way to stop it from taking over all the electronics in the city. It would be a race against time as the city starts to descend into chaos with machines going haywire.
Perhaps the gargoyles have some sort of immunity to the Resident Evil viruses. In the fanfiction, they could be the key to creating a cure. The story could follow a group of researchers from the Resident Evil universe who discover the gargoyles and try to study them. But the gargoyles are not just passive subjects; they have their own motives and goals, which could lead to a complex and engaging plot.
A possible plot could be that two gargoyles from different clans or buildings fall in love. They have to overcome the differences in their gargoyle cultures and the fact that their 'homes' are far apart. For example, one gargoyle might be from a modern skyscraper and the other from an old cathedral. They struggle to find a way to be together while still fulfilling their duties of protecting their respective structures.
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.
Well, Rory could be a new recruit. Maybe she uses her intelligence, like she did in her studies, to help the Avengers with some high - tech threats. For example, she could figure out a way to hack into an enemy's system that's causing trouble for the Avengers. Her quick - thinking and knowledge of various things could give the team an edge.
Maybe there's a crossover where the Kyuubi's chakra has some strange effect on the Gargoyles. It could either enhance their powers in unexpected ways or cause some sort of chaos that they have to work together to fix. For example, the Kyuubi's chakra might accidentally awaken an ancient evil in the Gargoyles' world, and Naruto and the gargoyles must use their combined strength and wits to stop it.
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.