One way it could work is if there was a time - travel or multiverse plot. For instance, Arrow characters could accidentally end up in Riverdale's time period or vice versa. They would then have to figure out how to get back while dealing with the local problems. Maybe Green Arrow has to help solve a mystery in Riverdale that's related to his own enemies in some way.
In a Riverdale and Arrow crossover fanfiction, the story could start with some sort of interdimensional rift that pulls characters from both shows into one world. Riverdale characters would be shocked by the violence and danger in Arrow's world. Meanwhile, Arrow characters might find the high school drama and relationships in Riverdale quite strange. There could be a big bad villain that only the combined skills of both groups can defeat. They would have to learn to work together despite their differences, and along the way, there could be some romantic subplots between characters from the two shows as well.
Arrow crossover fanfiction is fan - created stories that involve characters from the 'Arrow' series crossing over with characters from other shows, universes, or even different timelines within the Arrowverse. It allows fans to explore new storylines and interactions that may not have occurred in the official canon.
One idea could be that the characters from Riverdale somehow find themselves in the wizarding world of Harry Potter. Maybe Jughead could be a Muggle - born wizard who discovers his powers while at Hogwarts. He might write about his strange new experiences in his journal, just like he does in Riverdale.
A 'Green Lantern Arrow Crossover Fanfiction' often combines the unique elements of both Green Lantern and Arrow. It might bring together their powers, like the Green Lantern's power ring and Arrow's archery skills. For example, they could team up to fight a common enemy that neither could defeat alone.
One great 'Supernatural' and 'Arrow' crossover fanfiction is 'The Hunt in Starling City'. It combines the dark, supernatural elements of 'Supernatural' with the gritty, urban setting of 'Arrow'. The story has Dean and Sam Winchester arriving in Starling City to hunt a demon that's been causing chaos in the criminal underworld, which draws the attention of Oliver Queen and his team. They initially clash but then realize they need to work together to stop the greater evil.
One great Flash and Arrow crossover fanfiction is 'The City's Heroes United'. It has a really engaging plot that combines the unique abilities and personalities of the characters from both shows. The author does a great job of making the interactions between Flash and Arrow's characters feel natural.
In a Stranger Things and Riverdale crossover fanfiction, there are so many possibilities. The gangs from both shows could team up against a common enemy. Let's say a new evil entity that combines the characteristics of the Demogorgon and the Black Hood. The friendships and romances in the story could be completely reshuffled. Steve might have a fling with one of the Riverdale girls, or Nancy could become friends with Betty. And the settings could blend together, with scenes taking place in both Hawkins and Riverdale, creating a really engaging and unique story.
In some 'Riverdale Crossover Fanfiction', a crossover with a time - travel plot is really engaging. For example, when the Riverdale gang travels back in time to the 1950s and has to deal with the different social norms while also trying to get back to their own time. Also, crossovers with other teen drama shows where they have to compete in a singing or dancing competition together can be quite entertaining.
There are many out there. A popular 'Riverdale Crossover Fanfiction' involves a crossover with the 'Chilling Adventures of Sabrina'. The dark magic elements from Sabrina's world add a new dimension to Riverdale's already complex story. You can find these fanfics on websites like Archive of Our Own. Just search for 'Riverdale Crossover' and you'll get a ton of options.