There are probably 'Rachel Berry fanfiction' stories that focus on her relationships. For example, a story could explore her relationship with Finn in an alternate universe where things turned out differently. It could show how they might have overcome more challenges together and grown even closer.
One interesting Finn Hudson and Rachel Berry fanfiction could be where they reunite after a long time apart. Maybe Finn has been traveling and he comes back to find Rachel on the brink of stardom. They rekindle their old feelings and have to navigate their new lives while still holding on to their past love.
It could lead to a major shift in the story and dynamics among the characters. Maybe the other characters would struggle to cope with the loss and it could change the entire tone of the fanfiction.
It could be an overzealous security guard. If Rachel was at a high - profile event and the security guard misinterpreted her actions as something threatening or against the rules, he could be the one to call the cops and get her arrested.
One possible plotline could be Rachel dealing with the reactions of her friends and family. They might be shocked at first but then come around to support her. For example, her friends could throw her a baby shower, which would be a really heartwarming part of the story.
I'm not sure of specific popular fanfictions about Rachel Berry's death. Fanfiction can vary greatly in quality and content. Some might explore her death as a way to show the impact on the other Glee characters, like how Finn might react if Rachel were to die suddenly. It could also be a very dark take on the generally upbeat Glee universe.
One popular baby berry fanfiction might be those that focus on baby berry's adventures in a magical forest. It could involve encounters with friendly woodland creatures.
One popular 'Rachel Berry and OC fanfic' might be 'A New Star in Lima'. It often focuses on how the OC, an original character, interacts with Rachel Berry in the Glee club setting. The OC could be a new talented singer who challenges Rachel in a friendly way, leading to some great musical duels and character development for both.
Finn could be involved if the fanfiction wants to explore a relationship with him as the possible father. He was an important part of Rachel's life in the original series, and his reaction to the news would be significant.
Perhaps in the fanfiction, Rachel is wrongly accused of stealing a valuable prop from the theater. She was just borrowing it for inspiration but there's a misunderstanding and she ends up getting arrested. Then she has to fight to prove her innocence.
One possible plot is that the baby's father is someone unexpected. And Rachel has to deal with the reactions of her friends and family. She might also face challenges in her career because of having a baby at a certain point in her life. For example, some directors might be hesitant to cast a new mother. But Rachel, being the determined person she is, tries to prove that she can handle both motherhood and her acting career.