In a crossover fanfic, the angels and demons from Supernatural could be involved in The Walking Dead universe. For example, an angel might be sent to Earth to stop the spread of the undead, believing it's part of a grand plan to save humanity. Meanwhile, the demons could be taking advantage of the chaos, making deals with desperate survivors. The Winchester brothers would have to navigate this new dynamic while also dealing with the walkers.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a vast collection of fan - created stories, and you can simply search for 'Walking Dead Supernatural crossover' in their search bars.
One idea could be that the Winchesters somehow end up in the world of The Walking Dead. They might use their hunting skills to fight the walkers in a different way than the survivors are used to. Maybe they try to find a supernatural cause behind the zombie apocalypse.
One popular trope is the characters from both shows teaming up to fight a common supernatural threat. For example, the Winchester brothers from Supernatural joining forces with Rick and his group from The Walking Dead to battle a horde of zombie - like demons.
One idea could be that the Winchester brothers from Supernatural end up in the world of The Walking Dead. They could use their hunting skills to fight off the walkers. Maybe they'd discover that the zombies are somehow related to a demonic presence and try to find a way to stop it.
One idea could be that the Winchesters find themselves in the world of The Walking Dead. They might use their hunting skills to deal with both the zombies and any supernatural elements that start to emerge in that world. For example, they could discover that a witch is causing the zombie apocalypse as part of a dark spell.
Michonne and Sam Winchester would be a great pairing too. Michonne is a skilled fighter with her katana, and Sam is very intelligent and well - read. They could work together to research any possible links between the walkers and the supernatural. Sam could also help Michonne come to terms with any new, otherworldly threats they encounter.
Dean Winchester and Daryl Dixon would make an amazing pairing. Dean's tough - guy attitude and his skills with weapons combined with Daryl's survival skills in a post - apocalyptic world would be really cool to see. They could go on zombie - hunting trips together while also sharing stories about their pasts.
Sam Winchester and Daryl Dixon would be a great combination. Sam is intelligent and resourceful, and Daryl is a skilled tracker. They could share their skills and knowledge to survive in the zombie - filled world while also looking for a way to stop any supernatural forces at play.
First, choose the other universe you want to cross with. For example, if it's a superhero universe, think about how the powers would work in a zombie - infested world. Then, plan your characters' interactions. Will they be allies or enemies? Also, keep the tone of "The Walking Dead" - dark and gritty. Don't be afraid to make tough decisions for your characters.