The plot could be that Sheldon's friends are highly skeptical at first. They might think it's just a short - lived oddity. However, as the story progresses, they see Sheldon changing in positive ways. His girlfriend could introduce him to new hobbies or social situations that he initially resists but then grows to enjoy.
One possible plot is that Sheldon's girlfriend is also a brilliant scientist. They meet at a conference and start debating a complex scientific theory. This leads to mutual respect and eventually attraction. But then they face challenges like dealing with Sheldon's over - protective mother and his own insecurities when it comes to emotional intimacy.
Perhaps an intelligent and patient psychologist. She could help Sheldon understand his emotions better. Given Sheldon's complex personality, she would need to be very understanding and be able to handle his idiosyncrasies. This type of girlfriend could also introduce Sheldon to the world of human emotions in a more systematic way.
It could be about Sheldon getting back at someone who wronged him in the series. Maybe it's Leonard who ate his last slice of pizza without permission, so Sheldon devises an elaborate plan to make Leonard's life a little chaotic for a while.
In this fanfiction, perhaps Harry saves a girl from a dangerous magical creature during one of his adventures outside of Hogwarts. She's so grateful and as they spend more time together healing her wounds and such, they develop feelings for each other.
In the fanfiction, perhaps Beast Boy's girlfriend could be a new superhero in town. They meet during a battle against a common enemy. She first sees his brave side when he's in the form of a fierce beast, and she's drawn to him. As they get to know each other more, they start to date. Their relationship could be filled with adventures as they fight crime together and also deal with the normal relationship stuff like jealousy and misunderstandings.
It could be a new character, like a foreign exchange student from Beauxbatons. She has a different charm and magic style compared to Hogwarts students, which catches Harry's eye.
It could be that they entered into a marriage of convenience for some reason, like Penny needing to get health insurance through Sheldon's job. But as they keep it secret, they start to develop real feelings for each other over time. They would have to sneak around, which could lead to some comical and also some really sweet moments. For example, they might have secret dates at Sheldon's apartment when everyone else is out, and slowly discover new things about each other that they never knew before.
Sakura could potentially be Naruto's girlfriend in some fanfictions. Although in the original series she had feelings for Sasuke for a long time, in fan - created stories, the writers might explore a different path where she realizes Naruto's true worth and they end up together.
Well, perhaps Percy's new girlfriend has some unique powers. She could be from a different realm and introduce Percy to new cultures and magics within the story. Their relationship might start off rocky but then develop into a deep connection as they face challenges together, such as fighting off a common enemy or solving a mystery that threatens their world.
Perhaps the target is Howard. Howard might have made a joke about Sheldon's mother that Sheldon didn't appreciate. As a result, Sheldon could try to get revenge by interfering with Howard's work on the space station projects, causing minor but annoying setbacks.
She could be a mysterious girl who has been watching Percy from afar and finally decides to approach him. Maybe she's a half - nymph with the ability to communicate with nature, which Percy finds fascinating.