A great spn crossover fanfic often has well - blended universes. For example, if it's a crossover with Harry Potter, it should seamlessly integrate the magic of Hogwarts into the spn world. The characters from both should also be in - character. If Sam and Dean meet Harry, they should react in ways that are true to their personalities.
Sure. 'Supernatural and Sherlock' is an interesting spn crossover fanfic. It combines the mystery-solving elements of Sherlock with the supernatural world of Supernatural in a really engaging way.
A cool concept would be a joint mission. The Supernatural side has to deal with a powerful, ancient evil that has some connection to the vampire origin in the TVD world. So, they team up. Dean might be initially hesitant about working with vampires like Stefan and Damon, but they soon realize they need each other's skills to defeat this new threat.
I think a key factor is the character development. If the doctor undergoes significant changes or growth as they encounter the spn universe, that can make for a compelling story. Plus, creative use of the settings and conflicts from both the medical and supernatural aspects can draw readers in.
A really interesting plot could involve the Tesseract from the Avengers. It could be that the Tesseract has some sort of connection to the Darkness in SPN. When the Avengers are trying to protect the Tesseract, they accidentally release some of the Darkness. The Winchesters, with their knowledge of the supernatural, and the Avengers, with their superpowers, must then join forces to contain the Darkness again. The characters could also have some really fun interactions, like Dean being in awe of Iron Man's technology and Steve Rogers being impressed with Sam and Dean's hunting skills.
Sam Winchester and Bruce Banner would be an amazing pairing. Sam is highly intelligent and well - read, and Bruce is a brilliant scientist. They could bond over their knowledge and maybe even find a way to control the Hulk better. Also, Natasha Romanoff and Charlie Bradbury would be a cool pair. They're both strong, independent women with a lot of skills. Natasha could teach Charlie some combat moves, and Charlie could introduce Natasha to some cool geeky stuff like LARPing.
The key is to find common ground. For example, both shows deal with the supernatural. So, a plot where a powerful supernatural entity threatens both the world of Supernatural and Mystic Falls would bring the characters together. Sam's knowledge of lore could combine with Bonnie's magic skills to fight this entity.
One possible SPN fanfiction could be where the reader is a hunter trying to stay in shape by counting calories while on the road with the Winchesters. They might face challenges like finding healthy food options during hunts.
Well, it can show the reader's struggle for normalcy. In the chaotic world of SPN, counting calories can be a way for the reader character to hold on to something ordinary. It gives a contrast to the crazy supernatural stuff going on.
A great SPN bedtime story could involve the brothers facing a group of mischievous imps. The imps were causing chaos in a neighborhood, like making things disappear and creating spooky noises. Sam and Dean use their wits and a few special tools to catch the imps and put an end to the mayhem.