John Diggle is another character worth focusing on. His loyalty to Oliver Queen and his military experience make him a valuable asset. In a crossover, he could provide the strategic thinking needed when The Flash and Arrow are up against a seemingly unbeatable foe. His no - nonsense attitude also provides a good contrast to the more light - hearted Flash.
Felicity Smoak could also be a key character. She's the tech - genius in the Arrowverse. In a crossover fanfiction, she could play a crucial role in creating a device that helps The Flash and Arrow defeat a high - tech villain. Her relationship with both heroes adds an extra layer of drama and humor.
Felicity Smoak from Arrow could also be a great focus. Her tech - savvy skills could be crucial in helping Supergirl deal with some high - tech threats she might face. Also, Winn Schott from Supergirl could have some interesting interactions with the Arrow team when it comes to building gadgets or hacking systems.
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.
Oliver Queen, or Arrow, is also highly popular. His skills with a bow and arrow, along with his brooding and complex personality, add a lot of depth to the crossovers. He is often the more serious and strategic one compared to Barry.
A plot twist could be that a character from one of the shows, who seems to be a minor or unassuming figure, is actually a powerful being from the future sent to manipulate the events of the crossover. This person has been subtly guiding the actions of the heroes, and when the truth is revealed, it completely changes the heroes' perception of the events they've been through and who they can trust.
Obviously, The Flash and Arrow themselves are must - includes. Their dynamic and different power sets make for great interactions. Also, Cisco Ramon from the Flash side is popular as he can bring in his tech - wizardry to help in the crossover.
The Flash (Barry Allen) could also be a great character to include. Since he has crossovers with both Arrow and Supergirl in the actual shows. His light - hearted nature and super - speed abilities could add a different dynamic to the story. He could act as a mediator between Oliver and Kara when they have differences. Also, villains like Lex Luthor could be really interesting to explore in this crossover. His brilliant mind and devious plans could pose a significant threat to both heroes and force them to work together in new ways.
A good Flash and Arrow crossover fanfiction often has well - written character interactions. Since both shows have distinct characters with their own quirks, getting them to interact in a believable way is key. For example, Flash's light - heartedness against Arrow's brooding nature can create interesting dynamics.
Another theme is friendship. The fanfictions usually explore the developing friendships between the characters from the two shows. They might start off a bit distrustful but then grow to respect and rely on each other. A lot of stories show how Oliver and Barry become closer friends through their shared adventures.
One common theme is teamwork. Since the Flash and Arrow are from different shows, fanfictions often focus on how they can combine their unique skills to fight a common enemy.
Barry Allen is a very interesting character to write about. His super - speed gives a lot of scope for creative writing. You can explore how he experiences time differently, or how he uses his speed in unique ways to solve problems. Oliver Queen is also great. His dual identity as a playboy billionaire and a vigilante archer provides a lot of depth. Writers can delve into his internal struggles, like his fight against his dark side and his journey to become a better hero.