A possible plot could be that Barry Allen is running through time and space and accidentally disrupts the Glee reunion. He then feels responsible and decides to help make it the best reunion ever. He could use his super speed to bring in some of the old Glee members who couldn't make it initially. And in the process, the Glee characters teach him some valuable lessons about the power of music and friendship.
Well, maybe the characters from both shows would come together for a big musical event. They could perform some amazing mash - up songs. For example, Supergirl's heroic characters could join the Glee club on stage and sing some inspiring anthems together.
Perhaps it's about a charity event where the actors who play the characters in The Flash and Glee come together for a reunion concert. The fanfiction could describe the behind - the - scenes preparations, the excitement of the fans, and the actual performance with a mix of Flash - themed stunts and Glee - like singing.
Another option could be Puck. They had a bit of a history in the show. In the fanfiction, they could have reconnected in a moment of passion and now she's pregnant. This would surely stir up a lot of emotions among the other Glee club members, especially those who were close to both of them.
Barry Allen from The Flash and Rachel Berry from Glee could be main characters. Barry's speed could be used in interesting ways, like helping Rachel get to auditions on time or saving her from some danger in the city. They could form an unlikely friendship and be at the center of the story.
One idea could be that the original Glee club members reunite to put on a charity show. They face old rivalries resurfacing but also rediscover their love for performing together. Maybe some of them have become big stars and some are still struggling, and they learn from each other's experiences.
One possibility is that it could bring a lot of drama. Her pregnancy might cause tension among the former Glee club members. Some might be excited for her, while others could be worried about how it will affect their reunion. Maybe there will be conflicts over who will support her during this time.
If Barry Allen joined the Glee reunion in fanfiction, he might bring a new perspective to the group. His experience of saving the world and facing challenges could inspire the Glee characters to be more confident and take risks in their performances. Also, he could use his superpowers to create some amazing visual effects during their shows, like running around the stage so fast that he creates a cool blur effect.
I think Santana from Glee and Alex from Supergirl would be great to focus on. Santana is sassy and confident, and Alex is strong and brave. They could get into some really fun arguments or team up to take on a common enemy. Also, Quinn from Glee and Lena Luthor from Supergirl could be an interesting pair. Quinn's transformation throughout Glee and Lena's complex character in Supergirl would create a lot of drama and potential for great storylines when they interact.
I think Rachel Berry would be a great main character. She was always so driven and her journey from a small - town girl with big dreams to a potential Broadway star was so interesting. In a reunion, she could be the one to bring everyone together and also face her own insecurities about whether she has really achieved all she wanted.