One idea could be Finn getting a bad case of the flu right before a big performance. His friends in Glee club would then have to figure out how to cover for him or help him get better in time. Another could be that Finn has an ongoing illness that he's been hiding from the club, and it finally starts to affect his ability to participate fully. Maybe he faints during a rehearsal, and then everyone rallies around him to support him through his sickness.
A really cool idea for a fanfiction could be that Rachel and Finn swap personalities for a day. Finn suddenly becomes super - focused on his Broadway dreams like Rachel, and Rachel has to deal with Finn's more laid - back attitude towards things. It would be a humorous and also a great way to explore their relationship from a different perspective.
Well, Finn could be facing an injury in football which makes him question his future in the sport. Meanwhile, the Glee club could be preparing for a big competition. Finn has to find a way to support his team both on the football field (even if he can't play) and in the Glee club, which leads to some heartwarming and inspiring moments.
One idea could be that Finn has a hidden talent for songwriting that he discovers while in the Glee Club. Another could be that he has to overcome some initial shyness about performing in front of others. Or perhaps he forms a special bond with one of the other members that helps him grow as a person and a performer.
Perhaps in the fanfiction, Finn and Puck find themselves in an alternate universe where being gay is the norm in the glee club. This allows them to freely explore their relationship without the fear of judgment. They could then face the challenge of how to bring this new - found confidence back to their original world.
Finn's sickness can be a great way to develop his relationship with his family in fanfiction. His mom could be overly protective, and Finn might initially resist but then realize how much she cares. His step - dad could also show a more fatherly side, taking time off work to take Finn to the doctor. This family dynamic can add depth to Finn's character and show how his sickness affects those around him, which in turn affects their relationships with him.
One popular Glee Blaine sick fanfiction is 'Under the Weather'. It beautifully portrays Blaine being sick and how the other characters, especially Kurt, take care of him. The story focuses on the tender moments between them during his illness.
In some fanfiction, Finn joining Glee could lead to a love triangle that was not explored in the original. For example, he could be caught between two characters who both have strong feelings for him. This would create a lot of emotional turmoil and interesting character dynamics as he tries to figure out his feelings while also dealing with the pressures of the Glee club.
One common theme is friendship. Since Will is a teacher and Finn is a student, their relationship can be explored in terms of mentorship and friendship. Another theme could be their shared love for music within the Glee club setting.
One possible plotline could be how Rachel and Finn deal with the reactions of their friends and family. Their friends in Glee club might be shocked at first but then rally around them for support.
One possible fanfiction could be about Finn's journey in football while also dealing with the drama in Glee club. Maybe he uses football as an escape from the pressures of the club, but then realizes how much the club and his friends mean to him and tries to balance both worlds.