It could also be a way for fans to express their own feelings about the show. If they thought that the show was becoming too predictable with Rachel always in the Glee club, they write fanfictions where she leaves to add an element of surprise and freshness to the story.
Some people write it to explore different storylines that weren't explored in the original show. Maybe they felt that Rachel's character had more potential for growth outside of the Glee club, so they create fanfictions where she leaves.
People write it because they love the characters. Santana and Rachel are both complex and interesting characters in Glee. Their relationship in the show has its own tensions and chemistry, and fans like to explore different possibilities for them, like a kiss.
In some fanfictions, Rachel leaves Glee to study music in a prestigious conservatory overseas. She has to adapt to a new culture, different teaching styles, and a whole new set of peers. It could show how she uses her Glee club experiences as a foundation while also evolving in this new and challenging setting.
People write it because Snape is such a complex character. His leaving in the original story leaves a lot of room for speculation. Writers want to fill in the gaps about what he might do next, where he might go, and what his future holds.
They might write such fanfics to give Harry a new adventure. After all the events in the original books, his story doesn't have to end in Britain. It's a way to expand on his character and see how he would react in different situations outside his familiar homeland.
People write 'Thomas Leaves Sodor' fanfictions because they want to explore new storylines. The original setting of Sodor can be a bit limiting sometimes, so they send Thomas away to see what new adventures he can have.
They are a popular pairing because they are so different. Puck is the bad boy and Rachel is the over - achieving diva. Their contrast makes for interesting storylines where they can learn from each other.
Maybe it's because she's often seen as the most talented singer in the show. Writers of fanfiction might just go with that perception and give her all the solos.
The appeal lies in the forbidden aspect. Since Will is a teacher and Rachel is a student, it adds a layer of excitement. Fans like to explore what could happen in this taboo situation.
In a fanfiction, Rachel and Santana could become friends after being paired for a project that has nothing to do with glee club. Maybe they have to work on a community service project. At first, they bicker constantly, but as they face challenges like dealing with difficult people in the community or coming up with creative solutions to problems, they start to respect each other. This newfound respect turns into a real friendship that surprises everyone around them.
Fanfiction about Will and Rachel in 'Glee' often explores their complex relationship in a more romantic and sometimes sexy way. It might include moments where they share a passionate dance that leads to a deeper connection, or a private conversation that reveals their hidden desires for each other.