Mike's character can be developed through his relationships with other humans in the fanfiction as well. If he has a friend who doesn't believe him about the animatronics, it can add depth to his character. He has to deal with the disbelief while also trying to figure out what's going on with the animatronics. For the animatronics, their development can come from their reactions to new situations. For instance, if a new animatronic is introduced, how do they react? Do they become more territorial or more inclusive? This shows different aspects of their personalities.
To develop Mike, you could make him start off as a very skeptical person about the animatronics. But as he spends more time with them, he starts to see them in a different light. You can show his internal struggle between his rational thinking and the strange things he experiences with the animatronics. Regarding the animatronics, each one can have a backstory. Chica might have been programmed with a motherly instinct, and as she gets to know Mike, she tries to 'care' for him in her own animatronic way. This helps to flesh out their characters.
One plot idea could be that the animatronics initially see Mike as a threat but gradually come to understand his good intentions. Maybe Mike has a special ability that allows him to communicate with them in a unique way, leading to a series of adventures where they have to work together to solve a mystery in the pizzeria. For example, they might be trying to figure out the true origin of the strange occurrences in the building.
It can start with fear. The night guard is initially terrified of the animatronics. But as time passes, small acts of kindness or non - aggression from the animatronics can make the guard start to question their initial assumptions. For example, if an animatronic leaves a small gift (like a trinket) for the guard instead of attacking him.
Freddy is often a popular character. His human animatronic form might be depicted as having a mysterious past, like he was once a normal human who was transformed into an animatronic against his will.
The animatronics in FNAF have a complex and creepy backstory. They are believed to be possessed by the spirits of children who met tragic ends at the location where the game takes place.
One common theme is friendship. Mike and the female animatronic often start as strangers and gradually become friends. They learn about each other's strengths and weaknesses.
In a crossover fanfiction, the interactions would be really interesting. Ford, if he were involved, would be very intrigued by the animatronics. He might study them to see if they are related to any of the other interdimensional beings he has encountered. Dipper would be the voice of reason, warning everyone about the potential danger. Mabel would try to find the good in the animatronics, perhaps believing that they are just misunderstood. Soos would be the comic relief, making jokes about the animatronics' appearance. Wendy would be the tough one, ready to fight if necessary. The animatronics themselves might be confused by the Gravity Falls gang. The ones that are more aggressive might see them as a threat, while the more docile ones might be curious about these new visitors.
One interesting concept could be the backstories of the human animatronics. For example, how they came to be in the form of animatronics. Maybe they were part of some experiment gone wrong in a spooky pizzeria.
One interesting fanfiction could be about a female animatronic who has a hidden past and tries to protect the kids in the pizzeria instead of harming them. Maybe she was programmed differently by a kind-hearted technician.
Obviously, Freddy and Mike are the main characters. Freddy, the iconic animatronic bear from FNAF, and Mike, who might be a security guard or someone closely associated with the pizzeria where Freddy is.
One popular fanfiction might be 'Mike and the Mysterious Female Animatronic'. It often delves into the relationship between Mike and a newly introduced female animatronic character. The story could involve them teaming up to solve mysteries within the animatronic world.