In some fanfictions, there could be a plot twist where Black Lightning's powers are transferred to another character in the Arrowverse. This would force that character to adapt quickly and also change the power balance in the crossover. It could lead to new alliances and rivalries as everyone tries to figure out what to do with this new situation.
Writers often use the characters' backstories to create conflict. For example, if Black Lightning is from a different part of the world compared to the Arrowverse heroes, his different cultural upbringing can lead to misunderstandings at first. Then they have to work through those to be able to team up effectively.
One common theme is the exploration of different power dynamics. When Black Lightning crosses over with other heroes, like in a crossover with Batman fanfiction, their powers interact in various ways. Another theme is teamwork. They have to learn to work together despite their differences.
One key element is the character interactions. Seeing characters like Clark Kent and Oliver Queen interact, given their different backgrounds and powers, is really exciting. Another element is the merging of storylines. For example, how the threats in Smallville might be related to those in the Arrowverse.
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.
Maybe the Flash could visit the MCU. He could race against Quicksilver. It would be a really cool showdown of speedsters from different universes. And then the Flash could get involved in an MCU - level threat, like Thanos' invasion but in a different timeline. He could use his speed to try and steal the Infinity Gauntlet from Thanos, creating a whole new plotline for a fanfiction.
One exciting plot could be that the Infinity Stones' power somehow disrupts the multiverse and creates a rift that connects the Avengers' universe with the Arrowverse. The Avengers end up in Star City and team up with the Arrow team to fight a common enemy, like a powerful sorcerer who wants to use the chaos to take over both universes. They combine their skills, with the Avengers' superpowers and the Arrow team's combat and archery skills.
Hush could be an interesting choice. He could be spreading false rumors and causing distrust between the heroes and the citizens of both cities. His knowledge of Gotham's underworld and his ability to manipulate people could make him a formidable foe for Batwoman and Arrow. They would need to uncover his true identity and stop him before he completely destroys the relationship between the two cities.
A cool concept could be a crossover where the technology in Gotham and the magic in Star City somehow get mixed up. Batwoman, being more used to high - tech gadgets, and Arrow, who has some experience with magic - related threats, have to combine their skills to set things right. For example, a device that was supposed to enhance Batwoman's suit ends up being enchanted by magic from Star City, and they need to figure out how to fix it and stop the villain who caused the mix - up.
First, you need to have a good understanding of the different shows in the Arrowverse. Watch all the relevant seasons and take notes on the characters, their powers, and their relationships. Then, think of a unique premise for your crossover. It could be a new threat that requires characters from different shows to work together.