One idea could be exploring the backstory of the Mimiga. Maybe there was a time before the events of the game when they had a more complex society. Another is to focus on Quote's life after the main story, like how he adapts to a more peaceful world. Or you could create a fanfic where an unknown Mimiga has special powers and becomes a key figure in saving the island from a new threat.
Well, you could write a fanfic about a friendship between a Mimiga and one of the bad guys who has a change of heart. For instance, a member of the Doctor's army realizes the wrongness of their actions and teams up with a Mimiga. Also, delving into the origin of the Doctor's madness and how it could have been prevented could make for an interesting plot. And don't forget about creating a story where the world of Cave Story intersects with another game's world, bringing in new challenges and adventures for the characters.
A great plot idea for a Cave Story fanfic could be a time - travel story. What if Quote was sent back in time to before the Doctor's experiments? He could try to prevent the chaos that ensued. Or perhaps a fanfic centered around the different regions of the game world that haven't been fully explored. You could introduce new species or mysteries in those areas. Additionally, writing about a Mimiga who dreams of leaving the island and their journey to make that dream come true, facing all the obstacles in the process, would be really engaging.
One idea could be a crossover with a popular RPG. The protagonist of Cave Story could find themselves in the world of the RPG, facing new enemies and having to learn different magic or combat systems. For example, if it's a Final Fantasy - like world, they might have to deal with complex job classes.
A cool plot for a Crystal Story 2 fanfic could be a story centered around a magical item that has been lost in the game world. The main character hears rumors about it and sets out on a quest to find it. Along the way, they face challenges from other characters who also want the item for their own reasons. It could also be interesting to write a fanfic about a character who gets cursed and has to find a way to break the curse while still dealing with the normal threats in the game world. Or perhaps a fanfic where two characters from different factions fall in love and have to overcome the differences between their groups.
One plot idea could be that Madara falls in love with a time - traveler. She comes from a future where she has studied his life. When she arrives in his time, she tries to prevent him from making certain mistakes. Madara is intrigued by her knowledge and her different way of thinking, and love blossoms between them as they work together.
A third idea is a love triangle in the Digimon world. A Digimon is in love with a human, but at the same time, another Digimon also has feelings for the same human. This could lead to a lot of drama, with the two Digimon competing for the human's affection, and the human having to decide between the two different worlds they represent.
One idea could be a fanfic where Harry discovers a hidden room in Hogwarts that contains ancient spells and artifacts from before the school was founded. This could lead to a whole new adventure as he tries to figure out what they are for and how to use them safely. Another idea is a story where the roles are reversed, like Hermione is the one who has the lightning - shaped scar and is the main target of Voldemort, and we see how that changes the dynamic of the story. Or perhaps a fanfic that focuses on the backstories of the minor characters, like Neville's parents before they were tortured into insanity, and how their story could have influenced Neville's journey in the wizarding world.
One interesting aspect could be the unique character interpretations. In fanfics about Sue from Cave Story, authors might explore her backstory in more depth, perhaps giving her more complex motives and emotions. For example, they could delve into her experiences before she meets the protagonist and how that shapes her actions in the game's story.
Another plot could revolve around the characters having premonitions of the events that are going to occur in the quarry. They then have to decide whether to trust these visions and how to act upon them. This could add a whole new layer of suspense and mystery to the story.
One idea could be a time - travel plot. The Backyardigans accidentally find a magical object in the backyard that sends them to different eras in history. They could have to work together to find their way back home while also learning about the different time periods. For example, they might end up in the prehistoric era and have to deal with dinosaurs.
One idea could be a story where one of the dalmatian puppies gets lost during a family outing and has to find its way back home, facing various challenges along the way.
One idea could be exploring the backstory of a minor character in the Bioshock universe. For example, a splicer's journey before they became spliced. It could show how they were once an ordinary citizen of Rapture and what led them to make the fateful decision to use ADAM. Another plot could focus on an alternate timeline where the protagonist makes different choices. Maybe they side with the wrong faction and have to deal with the consequences. A third idea is a story centered around a new type of plasmid that has unexpected effects on the user and how it impacts the power dynamics in Rapture.