I made this post to show you how to deal with these animatronics. Here, take a look! If you want to discover the mechanics for yourself then don’t look, obviously.

N. Fredbear: He will appear at the window. Shine your light at him and he should get away shortly.
Sounds: Dog barking

N. Springtrap: He comes through the hallway. if you hear breathing it means he is at the door. Close the door on him and he should go away shortly.
Sounds: Walking

Plushtrap: He is always in the closet and you cannot deactivate him. He kinda works like the puppet from FNaF 2. Plushtrap has a invisible meter and 3 Stages. When he reaches a specific value on the meter, Plushtrap will go to the next stage and you can’t put him back to his previous stage. If he reaches the end of the 3rd stage you’ll die. To prevent that come to the closet and shine your light at him it will decrease the meter.
Sounds: none

Nightmarionne: Nightmarionne doesn’t have a cycle. He is random. He can be at the window, in the closet or in the hallway. When he is at the window or closet, shine your light at him and he should go away shortly. When he is in the hallway however, close the door on him.
Sounds: Dog barking (Window), Knocking (Closet), Laughing (Hallway)