Maybe she's switched with a muggle - born witch who has a very different approach to magic. Hermione could then introduce her new family to more academic and traditional magic, while also learning from their more instinctive and creative use of magic. This could lead to some really interesting magical experiments and a new perspective on the wizarding world for both Hermione and those around her.
Another plot could be that the switch is part of a bigger conspiracy in the wizarding world. Hermione, in her new family, discovers that there are people who are trying to manipulate the bloodlines in the wizarding community. She then has to use her skills and the resources of both her new and original families to expose the conspiracy and set things right.
One idea could be that Hermione is switched with a pure - blood witch from a dark family. She then has to navigate the different values and expectations of this new family while still holding onto her own intelligence and thirst for knowledge. For example, she might be expected to participate in dark magic studies, but she uses her wits to find a way around it and secretly study light magic instead.
An interesting plot for a 'Switched at Birth' OC fanfic could involve an OC who is a journalist. They start investigating the story of the switched at birth incident for a school project or a local newspaper. As they dig deeper, they uncover secrets that not only affect the two families but also the hospital staff involved. This OC could also have a personal connection to one of the families, like being a long - lost relative of one of the parents, which adds more complexity to the story.
A cool Switched at Birth fanfiction idea might be to focus on a side character. Say, what if one of the parents' friends knew about the switch all along and now has to deal with the guilt of keeping it a secret. This could add a whole new layer of drama to the story. Or perhaps a fanfic where the switched girls meet in a different setting than in the show, like at a summer camp or on a trip abroad, and their relationship starts from there in a more unique way.
One plot idea could be that Bay and Emmett reunite after years apart. Maybe Emmett has become a famous filmmaker and Bay is still an artist. They meet at an art exhibition where Emmett is showing a film inspired by their past relationship. Another idea is that they both end up in a small town for different reasons and start to re - discover their feelings for each other while helping the local community with an art project.
In a 'rwby switched roles fanfic', a great plot could involve Ruby as Yang. She'd be the strong, brash fighter, not afraid to jump into a fight headfirst. Yang, in Ruby's role, would be the innocent - looking but actually very powerful fighter. She'd use her charm to fool opponents into underestimating her. Weiss and Blake could also switch, with Weiss being the more shadowy, cat - like character and Blake as the haughty, aristocratic type.
A possible plot could be that Bay is pregnant and Ty is initially not sure if he is the father. This creates a lot of tension and drama. Bay is determined to raise the baby regardless, but Ty decides to be there for her even with the uncertainty. As the story progresses, they find out that Ty is indeed the father through some sort of medical revelation. This journey of doubt and discovery could be filled with emotional moments and character growth for both Bay and Ty.
One idea could be to explore how Bay copes with the pregnancy while dealing with the shock of being switched at birth. Maybe she forms a unique bond with her biological family during this time.
A plot could revolve around the idea that a prophecy was tied to their true births. In Raven's world, there was a prophecy that a princess born on a certain day (which was actually Apple's real birth) would bring great change. In Apple's world, a similar prophecy about a powerful magic - user (Raven's true self) existed. When they are switched at birth, the events start to unfold in unexpected ways. The two girls must then figure out how to fulfill the prophecies in the wrong worlds they were raised in, all while dealing with the challenges of their newfound identities.
A possible plot is that a spell gone wrong makes Queen's music the only thing that can calm a dangerous magical creature. Hermione, being the clever witch she is, uses her love for Queen to figure out how to tame the creature and in the process, she also uncovers a long - lost magical connection between Queen's music and ancient wizarding magic.
A plot could be about a new student who arrives at Hogwarts just as Hermione is petrified. This new student has some special knowledge or ability related to the petrification curse. They team up with Harry and Ron to figure out how to save Hermione and also discover that the new student has a connection to the one who cast the spell in the first place. Maybe they find out that the new student's family has a feud with the heir of Slytherin.
A plot could revolve around Viktor inviting Hermione to visit his home country to learn about a different kind of magic. Along the way, they face various cultural misunderstandings and challenges together, which strengthen their bond. For example, they might encounter a local magical creature that only they can figure out how to deal with. And through this adventure, their relationship blossoms.