The main character could be an OC who is a security guard's daughter. She often visits the museum during the day and has a special connection with the exhibits. One night, she has to cover for her father who suddenly falls ill. As she patrols the museum, she discovers that she can communicate with the exhibits in a way no one else can and becomes involved in their nightly adventures.
Maybe the main character is an OC who is a magician. They are in the museum at night practicing a new trick when suddenly all the magic in the museum reacts to their presence. The magician OC then has to use their skills to control the chaos that ensues as the exhibits come to life and magic starts to run wild. They also have to deal with a jealous rival magician who has followed them into the museum and wants to steal their newfound power within the museum world.
A great main character for an OC fanfic could be a homeless person who takes shelter in the museum at night. This person has a deep love for history and art, even though they have no formal education in it. When the exhibits come to life, they see the OC as a kindred spirit. The homeless person then embarks on a journey within the museum, learning about the past and present of the exhibits and also finding a new purpose in life.
Well, perhaps the OC is a time - traveling artist. When they end up at the museum at night, they start to paint the exhibits as they come to life. But their paintings start to have strange effects on the museum world. For example, if they paint a dinosaur with wings, it actually grows wings. And the OC has to find a way to reverse these changes before the museum is completely transformed into a chaotic and unrecognizable place.
Maybe the main character could be an OC with a connection to a Greek goddess, like Athena. This character could be intelligent, strategic, and have some kind of special power granted by the goddess. They would be an SI, so they might have modern - day knowledge that they can combine with their goddess - given abilities to stand out in the Fate Stay Night world. They could be involved in trying to change the fate of certain characters or events based on their understanding of both worlds.
In the 'night at the museum novel', the most obvious main character is the night guard. He is the one who has to deal with the unexpected events when the museum awakens at night. He is usually the protagonist through which we experience the story. Besides him, there could be an old curator who might have some knowledge about the strange occurrences in the museum. And then there are the living exhibits. For example, a Roman centurion or an Egyptian pharaoh who could play significant roles. These characters from different historical periods and their interactions with the guard and each other form the core of the story.
You can start by giving your OC a unique backstory. For example, if they are related to one of the historical events associated with the exhibits in the museum. Then, decide on their personality traits. Are they brave like a knight in the museum's armor exhibit? Or are they shy but curious? Also, think about their goals and dreams. Maybe they want to uncover a long - lost secret of the museum.
The main character could be a young, aspiring Jedi who was injured in a battle and had to be given cybernetic parts to survive. This changes their relationship with the Force in unexpected ways.
One idea could be an OC who is a time - traveling historian. They get stuck in the museum at night and use their knowledge to communicate with the exhibits in unique ways, like deciphering ancient languages on the tablets. Another plot could involve an OC with the power to bring the museum exhibits to life outside of the museum, leading to chaotic but fun adventures in the city.
One idea could be to explore what happens when a new and very strange artifact is added to the museum. Maybe it has some sort of magical power that affects all the exhibits in unexpected ways. For example, it could make the dinosaurs start speaking in modern languages or the statues come to life with different personalities than before.
The main plot often involves the museum coming to life at night. The exhibits, which include historical figures and artifacts, start to move and interact. There are usually adventures and challenges as the characters, like the night guard, try to manage the chaos and also learn about the history and secrets of the museum's exhibits.
It could be two best friends. They decide to go on a spontaneous road trip for one night and two days. They share stories, laugh, and have a bit of an argument when one wants to take a different route. But in the end, they come out stronger as friends.
A strict teacher at Rydell High could be the main antagonist. The teacher might disapprove of the OC's influence on Michael, thinking that the OC is distracting Michael from his studies. The teacher could constantly be giving them detention or trying to keep them apart, which would create conflict in the fanfic.