One idea could be that the Scooby Gang from Buffy teams up with the BAU from Criminal Minds to solve a series of murders that seem to have a supernatural and a psychological aspect. Maybe the murders are being committed by a demon that is using human psychological weaknesses to target its victims.
To blend the worlds well, you need to consider the characters' personalities. The serious and scientific minds of the Criminal Minds team can contrast with the more laid - back and supernaturally - aware Buffy gang. This contrast can create interesting interactions and conflicts. For example, some of the BAU members might be skeptical about the existence of vampires at first. Then, as they witness it, they have to adapt their worldviews. You can also introduce a common enemy that requires both groups to work together. Maybe a demon that is using psychological manipulation to create chaos in both the human world and the Buffyverse.
One idea could be that the BAU team is called in to investigate a series of strange disappearances that seem to be related to a haunted location that Teamiplier has explored in one of their videos. The two groups initially clash due to their different approaches, but then they start to work together and combine their skills to solve the mystery.
One great CSI and Criminal Minds crossover fanfiction is 'The Merging of Minds'. It combines the forensic expertise from CSI with the psychological profiling of Criminal Minds in a really engaging way. The characters interact in a believable manner, like when Grissom from CSI and Hotchner from Criminal Minds work together on a complex serial killer case. It shows how their different approaches can complement each other.
Criminal Minds and Numb3rs crossover fanfiction can be really interesting. It often combines the crime - solving aspects of both shows. In such fanfictions, the characters from Criminal Minds, with their expertise in profiling criminals, might team up with the mathematicians from Numb3rs. This can lead to unique storylines where they use both psychological profiling and mathematical models to solve complex cases.
One great 'Criminal Minds' and 'NCIS' crossover fanfiction is 'The Joint Investigation'. It combines the unique profiling skills of the 'Criminal Minds' team with the naval - related cases of 'NCIS'. The story has a well - crafted plot that keeps you on the edge of your seat as the two teams collaborate to solve a complex case involving a serial killer with ties to the military.
Perhaps a fanfiction where a member of the Criminal Minds team, say Reid, gets framed for a crime that involves national security, which brings in the NCIS. The NCIS team initially suspects Reid but as they dig deeper, they realize he's been set up. Together, they work to clear Reid's name and find the real perpetrator who is using the situation to cover up a much larger conspiracy that spans both military and civilian sectors.
A unique feature is the blend of two distinct genres. You have the crime - solving aspect of Criminal Minds and the supernatural elements of Twilight. This creates a whole new set of storylines and conflicts.
Character interaction is key. A good crossover fanfiction should have the characters from CSI and Criminal Minds interacting in a way that makes sense. For instance, if the CSI team is dealing with a crime scene, the Criminal Minds agents should be able to contribute their psychological profiling skills to the investigation. Their different perspectives should add depth to the story.
Yes, there are quite a few. You can find them on fanfiction.net. Some of them blend the crime - solving aspects of both shows really well, creating unique and engaging storylines.