In 'supernatural is real fanfiction', angels and demons are usually very interesting characters. Angels with their celestial powers and complex hierarchies, and demons with their devious natures. Their interactions with humans and with each other can create a lot of drama and tension. Another interesting type of character could be the seers or prophets who can foresee events related to the supernatural, and their struggle to either change or accept what they see.
Sometimes, there are recurring characters like certain spirits or demons that the Ghostbusters keep encountering. These characters can be considered main in the sense that they drive the plot forward by constantly challenging the Ghostbusters and forcing them to come up with new strategies to deal with the supernatural.
Well, one interesting story could be about the Ghostbusters facing a new type of supernatural entity that has powers they've never encountered before. Maybe it can manipulate time and space, creating all sorts of chaos for the team.
Oliver Queen from Arrow and Dean Winchester from Supernatural make an interesting pair. They are both strong - willed leaders. Oliver's combat skills and Dean's hunting skills could complement each other well. They could go on adventures together, fighting both the criminals in Star City and the supernatural creatures in the Supernatural world.
Sam Winchester is definitely one of the most interesting. His dual life at Stanford and his hunting heritage make him complex. Also, Jessica, his girlfriend at Stanford, as she was an important part of his 'normal' life and her death was a turning point.
The Bell Witch Haunting is quite interesting. It was a series of events that happened to the Bell family in Tennessee. There were strange noises, physical attacks on family members, and the witch was said to communicate with them, often in a menacing way. It was so well - known that it became part of local folklore.
Well, Lucifer from 'Lucifer' could use his devil - may - care attitude to ruffle the feathers of the more serious characters in 'Supernatural' like Dean. He might make sarcastic remarks or act in ways that the 'Supernatural' crew isn't used to, which would create some humorous and tense situations.
Sam and Dean Winchester are often paired with the bride. They see her as a potential threat or an ally in their fight against Lucifer. Their interactions with her are full of tension and mistrust at first, but can develop into more complex relationships. Castiel is another. His angelic nature clashes with the bride's connection to Lucifer, and this creates some interesting dynamics as he tries to understand her and perhaps save her from Lucifer's influence.
Well, Veronica Lodge and Dean Winchester could have some great moments. Veronica is used to getting what she wants and being in control, but Dean is not one to be pushed around easily. Their personalities would clash in an interesting way. At the same time, they might find common ground in their determination to protect those they care about. And then there's Sam Winchester and Kevin Keller. Kevin has his own knowledge of the supernatural from his Riverdale experiences, and Sam would be able to add to that knowledge. They could form a great team in researching and fighting off the supernatural threats in the crossover.
Sam Winchester would be really interesting. His research skills could help figure out the strange rules and secrets of the Hunger Games world. Peeta Mellark could also be a great addition. He's good at strategy and forming alliances, and he could form an alliance with Sam. And then there's Crowley. The King of Hell could be a wild card in the Games, either helping or hindering the tributes depending on his own motives.
Definitely Castiel. Castiel has his own complex relationship with death and the divine in the Supernatural world. Pairing him with the Angel of Death would create a really interesting dynamic. They both have different views on mortality and the afterlife, which could lead to some great character interactions.