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.
A different plot might be that Mike is actually a descendant of the original creator of the animatronics. The animatronics sense this connection and believe he can help them regain their true identities or break free from some sort of dark curse that has been placed on them. So they start to protect Mike from other forces that are trying to harm him in the pizzeria.
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 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.
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 interesting plot could be the night guard gradually forming an unexpected bond with the animatronics. For example, the night guard discovers that the animatronics have a hidden side that is not as menacing as they seem at first. This could involve the animatronics protecting the night guard from some other unknown threat in the pizzeria.
One plot idea could be that Female Foxy is initially hostile towards Mike in the fanfic. But as the story progresses, they find themselves in a series of dangerous situations within the FNAF world, like being trapped in a malfunctioning animatronic room. Through working together to survive, they start to understand each other better and develop an unlikely friendship. This could lead to them protecting each other from other menacing animatronics and ultimately changing the dynamic of the entire pizzeria.
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.
One idea could be a prequel story focusing on how Mike got into the stripping business. Maybe he had a bet with a friend or was in a tough financial situation and saw it as a quick way to make money.
Well, it could be about Freddy having some kind of special bond with Mike. Maybe Freddy sees something in Mike that others don't, like his courage in the face of the spooky things in the FNAF world. It might involve Freddy protecting Mike from the other animatronics that could be jealous or just acting on their programming.
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.