Supernatural and Brooklyn 99 Crossover Fanfiction: What Could the Plot Be?

Definitely Dean and Jake. Dean is all about the action and his tough - guy persona, while Jake is this goofy but smart detective. They could bond over their love for solving cases, though their methods are very different. Jake might be a bit freaked out by Dean's knowledge of the supernatural at first.

One idea could be that the Winchester brothers from Supernatural are investigating a series of strange murders in Gotham City. They cross paths with Batman who initially is suspicious of them. Eventually, they realize that a demon is behind the killings and they team up. Batman provides his detective skills and combat abilities while the Winchesters use their knowledge of the supernatural to defeat the demon.

It could be a hilarious adventure. Picture the characters from Brooklyn 99 getting into the afterlife scenarios of The Good Place. Jake's antics would surely disrupt the carefully planned system of The Good Place. Maybe he'd try to outwit the points system or come up with some crazy detective work to figure out the mysteries of the afterlife there.

Maybe there's a situation where the points system in The Good Place is being hacked, and it's somehow related to a criminal in Brooklyn. The Brooklyn 99 team travels to The Good Place to investigate. As they dig deeper, they find out that it's a plot by a disgruntled former resident of The Good Place who wants to change the system. The Brooklyn 99 characters bring their own perspectives on justice and fairness, which challenges the existing beliefs in The Good Place. And there would be a lot of comical moments as the two groups interact, like Holt trying to communicate with Janet in his very formal way.

One creative idea is a time - travel crossover. For example, the characters of Brooklyn Nine - Nine traveling back in time to a different era, like the 1920s, and having to solve crimes while dealing with the cultural differences of that time. It's a really cool concept.

One interesting plot idea could be that the Flashpoint event somehow creates a rift that pulls characters from Supernatural into the Flashpoint universe. For example, Sam and Dean Winchester could be chasing a demon that escapes into this new, altered reality. They'd have to deal with the different laws of physics and the presence of superheroes like Flash. Another idea is that a powerful supernatural being from the Supernatural world causes the Flashpoint event in the first place, perhaps as part of a larger plan to reshape all of existence. And a third idea could be that a character from Flashpoint, like Iris West, has some latent supernatural ability that is awakened by the presence of the Winchester brothers, and they have to figure out how to control it before it causes chaos in both their worlds.

One idea could be that the Winchesters end up in Star City and team up with the Arrow to fight a demon that is using technology to cause chaos. Maybe the demon has possessed some of the tech - savvy villains in the Arrowverse.

One interesting plot point is the clash of different supernatural powers. For example, the vampires' strength and speed in Twilight against the various abilities of the hunters in Supernatural like exorcising demons. Another is the cultural shock between the two universes. The vampires in Twilight have their own society and rules which are very different from the world of Supernatural.

One idea could be that the Avengers are facing a supernatural threat that they can't understand. So they seek the help of the Winchesters from Supernatural. The Winchesters introduce them to the world of the supernatural, like demons and ghosts. And together they combine their skills, the Avengers' superpowers and the Winchesters' hunting knowledge to defeat the threat.

Perhaps there could be a crossover where the Endbringers in 'worm' are actually manifestations of some ancient supernatural evil. And a group of supernatural hunters from another dimension come to Brockton Bay to fight them, teaming up with local parahumans.