One popular idea could be the interaction between different species from the 'angel bones' universe and characters from the crossover universe. For example, how an angel character might react to a magic - using character from another world.
Another idea could be exploring new storylines that involve the unique powers and abilities of the 'angel bones' characters in the context of the crossover world. Maybe a character with bone - related powers has to face a different kind of threat in the new setting.
One idea could be that Brennan and Castle team up to solve a crime that has elements related to both their areas of expertise. Maybe it involves a historical skeleton discovery at a crime scene Castle is investigating.
One idea could be that Buffy and the Bones team have to work together to solve a mystery involving a supernatural entity that leaves behind skeletal remains with strange markings. The Bones team's scientific expertise and Buffy's knowledge of the supernatural would create an interesting dynamic.
There could also be new characters created specifically for the fanfiction. These characters might be hybrids of the two universes, having traits from both 'angel bones' and the crossover world. They could play a crucial role in bridging the gap between the two different settings and storylines, adding a new dynamic to the narrative.
One popular one could be 'Soulmates Across Dimensions'. It beautifully weaves the two universes together, exploring how Buffy and Angel's relationship might develop further in new and unexpected ways. It has some great action scenes and emotional moments.
One idea could be a crossover with a detective show. The angels could assist the detective in solving a case that has a supernatural element to it. For example, they might help the detective figure out that a series of murders are being committed by a demon in human form.
One idea could be a crossover with 'Cardcaptor Sakura'. Daisuke could meet Sakura and they could both discover that their magical artifacts have some strange connection. For example, the Dark and the Clow Cards might react to each other in unexpected ways.
One idea could be that the vampires in Buffy's world somehow cross over to the Dark Angel universe and the transgenic characters have to deal with them. They might initially mistake vampires for some new kind of transgenic experiment gone wrong. Another idea is that Buffy herself travels to the Dark Angel world and teams up with Max to fight against a common enemy that is threatening both of their worlds, like a powerful demon that has found a way to use transgenic technology for evil purposes.
One idea could be that Angel arrives in the Harry Potter universe to help fight the dark forces. He could use his vampire strength and combat skills to assist in battles against Voldemort and his Death Eaters. Maybe he teams up with Harry and his friends, sharing his knowledge of the supernatural world which is different from the magic in the Potterverse.
Some people like the idea of a Slenderman and Minecraft crossover in fanfiction. Picture Slenderman lurking in the blocky Minecraft landscapes, scaring the players. Another possible crossover is with the Gravity Falls universe. Dipper and Mabel could stumble upon Slenderman during one of their adventures in the strange town. And a crossover with the Resident Evil series would be intense. Slenderman in a world full of zombies and bio - horror threats would create a really complex and terrifying scenario for a fanfiction.
Maybe there's a case where the Bones team discovers a body that has a connection to an old family in Sleepy Hollow. The family has a long - held secret that involves a pact with a dark force. Crane and the Bones team must work together to uncover the truth. The team might initially be skeptical of Crane's tales of the supernatural, but as they dig deeper, they start to realize that there might be more to it. Brennan could analyze the bones in ways Crane never thought possible, while Crane could provide historical and supernatural context that helps the team understand the bigger picture.