A great crossover idea is that the Riverdale gang could be transported to the Arrowverse due to some interdimensional rift. They then have to adapt to this new world full of superheroes and super - villains. Riverdale's FP Jones could have some sort of past with one of the Arrowverse characters, like a shared mission in their younger days. This connection could bring a new dynamic to the story. And the high school setting of Riverdale could be juxtaposed with the more urban and high - tech settings of the Arrowverse cities.
One interesting crossover could be the characters from Riverdale getting involved in an Arrowverse - style crisis. For example, Archie could find himself in Star City during a meta - human attack and team up with Green Arrow. The contrast between the small - town drama of Riverdale and the high - stakes superhero world of the Arrowverse would create great storylines. Another possibility is Betty and Veronica using their wits and resources to help the Arrowverse characters solve a mystery that has both normal and super - powered elements.
One interesting crossover could be the Flash from Arrowverse meeting Quicksilver from the Avengers. They could have a race to see who is truly the fastest. Another could be Green Arrow teaming up with Hawkeye for an archery - based mission where they share their different techniques and arrow - making skills.
In some Harry Potter and Riverdale fanfiction, the houses in Hogwarts could be compared to the social groups in Riverdale. For example, Gryffindor's bravery could be related to how the Bulldogs in Riverdale stand up for what they believe in. Slytherin's cunning might be similar to how some of the more devious characters in Riverdale operate. And then there could be a plot where characters from Riverdale are sorted into Hogwarts houses and have to adapt to the new environment based on the traits of their houses.
In a crossover, Archie's relationship with his friends might change. He's used to being the football star in Riverdale, but in the Arrowverse, he could be in awe of the superheroes. His friendship with Jughead might be tested as Jughead tries to keep Archie grounded while Archie is excited about the new world. Betty and Veronica's relationship could also shift. They might compete in a different way, like trying to impress a certain Arrowverse hero. Their friendship could become more competitive or they could find new common ground in helping the heroes.
One interesting crossover could be the characters from Riverdale getting involved in the mystery-solving of Pretty Little Liars. For example, Archie might use his musical skills to charm some of the PLL characters while also helping them figure out who 'A' is. Another could be Veronica using her wits and family connections to dig into the secrets in Rosewood.
One idea could be a crossover of characters from different Arrowverse shows on Earth X. For example, having Barry Allen from 'The Flash' team up with Kara Danvers from 'Supergirl' to fight against the evil regime on Earth X. They could use their super - speed and super - strength respectively to take on the powerful foes there.
A different approach could be a crossover of the families in both universes. Maybe the Uzumaki family has some connection to one of the Riverdale families in the past. This could lead to a story where Naruto has to come to Riverdale to uncover the secrets of his family's connection. Along the way, he befriends the core group in Riverdale and they all work together to solve this mystery that spans two very different worlds.
One interesting concept could be the different team - ups. For example, Batman might team up with Green Arrow in unique ways that we don't see in the regular DC universe. Maybe they combine their detective skills to solve a complex mystery that spans across both Gotham and Star City.
One idea could be a story where characters from different Arrowverse shows team up to fight a new, powerful villain from a different dimension. For example, Oliver Queen from 'Arrow', Barry Allen from 'The Flash', and Kara Danvers from 'Supergirl' could combine their skills and powers to take on this threat.
One interesting Arrowverse OC fanfiction could be about an OC who has the power to manipulate time and how they interact with the existing heroes and villains in the Arrowverse. They might start by trying to prevent a major disaster that was foreseen in a vision.
One interesting crossover could be Naruto characters getting the ability to transform into Transformers. For example, Naruto himself might be able to turn into a powerful Autobot with his own unique color scheme and abilities based on his ninja skills like the Rasengan could be incorporated into a weapon in his Transformer form.