A great idea for a Theory of Love fanfiction is to delve into the backstories of the secondary characters and how their stories intersect with Third and Khai's love story. For instance, Two and Un's relationship could be explored more deeply and how it has an impact on Third and Khai. Maybe Two has some advice for Khai based on his own experiences in love. Additionally, you could write about a misunderstanding that is much more complex than in the original story, like a miscommunication that involves multiple characters and it takes a long time for Third and Khai to resolve it, which tests the strength of their relationship.
One interesting idea could be the exploration of new combinations of existing ninjutsu. For example, mixing water and wind ninjutsu in a way that creates a unique ice - based attack that has never been seen in the original Naruto series. Another idea might be the origin of certain ninjutsu being traced back to ancient and forgotten clans. Maybe there are ninjutsu that were once powerful but lost over time, and fanfiction can revive and re - imagine them.
One interesting idea is exploring the characters' lives outside of the show's main plot. For example, fanfiction might delve into Sheldon's childhood in more detail, like his experiences in school that made him the way he is. Another idea could be alternate relationships. Maybe a fanfiction could explore what would happen if Penny ended up with Raj instead of Leonard.
One interesting idea could be exploring the backstories of minor characters. For example, in some fanfictions, they might delve into the early life of a stormtrooper and what led them to join the Empire. Another idea could be alternate endings to the movies. Maybe in a fanfiction, Luke Skywalker turns to the dark side, which would be a really different take on the story.
One idea could be a crossover with 'Star Trek'. The characters from 'The Big Bang Theory' could find themselves on the Enterprise, with Sheldon trying to understand the advanced technology there. Another idea is a crossover with 'Doctor Who'. The Doctor could arrive in Pasadena and interact with the gang, leading to some hilarious scientific debates. And perhaps a crossover with 'Futurama', where the two groups of characters explore different time periods and universes together.
A fun idea could be that the Big Bang Theory characters travel back in time and end up in the era of the founding of Hogwarts. They could meet the four founders and try to introduce them to modern scientific concepts. This would lead to some really interesting interactions as the wizards are trying to understand things like electricity and gravity.
One idea could be exploring how small, chaotic events in a character's past in a fate - based story drastically change their future. For example, a single missed encounter due to a chaotic traffic jam might lead a character on a completely different path of destiny.
A plot could be that Bernadette finds out she's pregnant right before a big work project. She has to decide whether to tell her boss or keep it a secret for a while. It would be interesting to see how she manages both her career and the pregnancy at the same time.
One plot idea could be that Amy and Sheldon have to deal with all the chaos that comes with preparing for a baby while still maintaining their unique relationship quirks. For example, Sheldon might try to create a scientific schedule for the baby's development and activities, much to Amy's amusement and occasional frustration.
Another concept could be a magical or supernatural 'kidnap love fanfiction'. The kidnapper could be a supernatural being, like a vampire or a werewolf. He kidnaps the human he loves because he wants to protect them from other dangerous supernatural creatures. But the human doesn't understand his motives at first and struggles against him. As time passes, they develop a strange and intense love relationship.
Well, you could write about two immortals who have known each other for centuries but only fall in love after a series of events that make them see each other in a new light. Maybe they were enemies before, but now they discover that their ageless existence is more meaningful when they are together. It could involve battles, reconciliations, and a deep exploration of their eternal feelings.