One idea could be an OC who is a brilliant but socially awkward surgeon. They struggle to fit in with the existing teams at the hospital. For example, they might have a unique surgical technique that saves a patient no one else could, but their lack of bedside manner causes some friction. Another plot could be an OC nurse who has a secret past with one of the main doctor characters. This could lead to a lot of drama and emotional turmoil as their past is gradually revealed. And a third idea is an OC who is a medical student with a rare medical condition. They are determined to become a great doctor while also dealing with their own health issues, which could inspire the other characters and add a new dimension to the story.
Maybe an OC who is a patient with a very rare medical condition that the doctors at Grey Sloan Memorial have never seen before. The OC's journey through diagnosis and treatment could be a central plot, and their relationship with the doctors could develop in interesting ways. For example, they might form a special bond with a particular doctor who is determined to figure out how to help them.
One idea could be a story where a long - lost relative of one of the main characters shows up at the hospital. This new character could bring a whole new set of family drama and secrets. Another plot could be about a patient who has a very rare and mysterious illness that the doctors struggle to diagnose. It would be a great opportunity to show the doctors' determination and teamwork. And a third idea could be a time - travel story where a character goes back in time to when they first started at the hospital and has a chance to change some of the things that went wrong in their life.
A plot could revolve around a portal that opens up between the two universes. Some of the Grey's Anatomy characters accidentally get transported to Supergirl's world. They find themselves in the middle of a chaos where Supergirl is trying to save the city from a threat. The doctors then use their skills to help the injured civilians while also trying to find a way back home. Meanwhile, Supergirl is intrigued by their medical knowledge and they start to exchange ideas about how to save lives in their respective worlds.
One idea could be Teddy facing challenges at work while being pregnant. Maybe she has to deal with difficult patients or colleagues who doubt her abilities due to her pregnancy. For example, she could be in the middle of a complex surgery case when she starts to feel unwell because of the pregnancy, but she still pushes through to save the patient.
There might be a fanfic where the characters from 'Grey's Anatomy' find themselves in the 'Harry Potter' universe. The surgeons could be learning about magical anatomy, like the structure of a hippogriff or a unicorn. They would have to adapt their medical knowledge to this new and magical world.
One interesting Grey's Anatomy fanfic could be about the alternate universe where Meredith and Derek never got together. It could explore how their lives and the lives of their friends at the hospital would be different. Another might focus on a character like Cristina Yang coming back to Seattle Grace for a special surgical case, bringing back her old charm and competitiveness.
One great Grey's Anatomy fanfiction is 'Love in the OR'. It beautifully weaves new romantic storylines among the characters. Another is 'The New Interns' which focuses on the fresh faces in the hospital and how they interact with the regular cast. And 'A Different Path' takes a unique turn on the show's story by changing some key events and seeing how the characters develop differently.
A really interesting plot point could be a situation where a Grey's Anatomy doctor, like Owen Hunt, accidentally travels to the Harry Potter world. He would be completely out of his element, trying to understand the magic, the creatures, and the social structure. Meanwhile, back in the Muggle world, the other doctors are trying to figure out how to get him back. This would create a great opportunity for cultural exchange between the two universes, and for the characters to grow as they face new and unfamiliar challenges.
A great plot twist would be if Meredith time - travels to an alternate reality within the Grey's Anatomy universe. In this alternate world, all the relationships are different. For instance, she might find that she and Alex are married instead of her and Derek. This would completely shake up her understanding of her own life and the people around her. It could also lead to her trying to find a way back to her 'true' reality while also learning valuable lessons about her relationships and herself in this strange new world.
There are quite a few 'grey's anatomy crossover fanfiction' that involve crossing over with other medical dramas. For example, a crossover with 'ER' can be really engaging. The hectic ER environment combined with Grey Sloan Memorial's drama creates a whole new set of storylines. Writers often explore how the characters from different shows would handle similar medical cases, and it can lead to some very creative plotlines.