It's not perfect, but here's my idea on what a FNAC UCN could be like. Every character's strategy is in the Notes. All characters displayed here (including himself) belong to Emil Macko. I do not own any of them.
Candy: Will come down from the left hallway to the door. Cindy: Will come down from the right hallway to the door. Chester: Will crawl through the vents. Use the snare. Blank: When his eyes show up in the window, close it. Old Candy: If you don't check Cam 12 every now and then, his parts appear one by one until he fully builds. RAT: When he shows up in the Office, quickly pull up the camera. W/N/Candy: shine the light when he appears in your Office. W/N/Cindy: shine the light when she appears in your Office. W/Chester: when he bangs on the hallway vents, find his camera and click on him. W/Blank: shine the light when he appears in your Office. W/RAT: he will try to crash the cameras more frequently than W/Penguin. W/CAT: he will bang the hallway vents more frequently than W/Chester. The time limit until he gets in is also faster. Monster Rat: shine the light in his eyes! He will dodge it multiple times before leaving. Monster Cat: shine the light in his eyes! He will dodge it multiple times before leaving. Costume Rat: An ad will pop up advertising the Rat and Cat Theater. Close the ad or else it will create an audio disturbance. Costume Cat: An ad will pop up advertising the Rat and Cat Theater. Close the ad or else it will create an audio disturbance. The Puppeteer: he and Vinnie work together. He will be standing in your Office for the whole night. If he starts smiling, that means Vinnie is active in the Prize Corner. Go to that camera and press the deactivate button. If Vinnie is not chosen in the selection menu, Puppeteer will not do anything (free points). Vinnie: he and the Puppeteer work together. If the Puppeteer is not chosen in the selection menu, Vinnie will not do anything (free points). 60's Vinnie: he will sit in the Office. If his eyes open, shine the light in his eyes. Monster Vinnie: same as 60's Vinnie. He opens his eyes more frequently. Him and 60's Vinnie take turns. Nightmare Candy: he cannot be seen in any of the cameras, but the glow of his eyes will shine through from either one of the doorways. Close the doors to send him back into the darkness! Shadow RAT: when he appears on the cameras, quickly switch to a different one! Shadow CAT: when he appears on the cameras, quickly switch to a different one! Shadow Candy: If you hear his noise, look for the door he's coming in from, then shut it quickly! Origami Cat: Pay him 10 Coins, and he'll give you a random Power-Up to help you survive! Toys: ??? (Trash and the Gang) Lollipop: He will summon one of the 40 characters from the selection (minus the ones you've picked). If you already chose everyone, then he will summon one of three new characters (Phone Guy, Deepscape Cat, and Battery). Penguin: don't let him get in through the right door, or else he will close random doors! W/Penguin: when he appears on your camera feed, quickly switch to another camera to avoid him crashing the systems! Deepscape Rat: he will randomly rush across the screen. Don't let your mouse cursor hover over him! Burger: if he appears on your desk in the Office, click him before pulling back up the camera! Blank (Fixed): he gets annoyed if characters that don't necessarily kill you keep getting their way (Toys don't count). Avoid them so you don't get jumpscared! Old Candy (Fixed): he gets angry if it gets too noisy, and he will come kill you if it gets too loud. If you hear footsteps, try to turn off everything that's making noise. New Candy: Check the New Stage camera to make sure he and New Cindy are performing. If he deactivates, motivate him with an electric shock ;) . If you don't do it in time, New Candy will escape the stage and start heading towards you. There is no stopping him once he leaves. New Cindy: Check the New Stage camera to make sure she and New Candy are performing. If she deactivates, motivate her with an electric shock ;) . If you don't do it in time, New Cindy will escape the stage and start heading towards you. There is no stopping her once she leaves. Phones: A phone will occasionally start ringing. Find the correct phone in the cameras and deactivate the phone or else it's ringing will create an audio disturbance, alerting Fixed Old Candy. Dawko Puppet: if you hear a Dawko video playing, go to the Dawko camera and pause the video. Markiplier Animatronic: if you hear a Markiplier video playing, go to the Markiplier camera and pause the video. Emil Ace Macko: a pop up will appear with a download bar for FNAC 4. Quickly close the pop up before the bar fills. Forgotten Candy: After completing the Cat's Meow challenge, Forgotten Candy will unlock. He is extremely unpredictable, because he can get to your office from literally anywhere. Vents, Doors, Windows, you name it. Once unlocked, a new Cat's Meow 2 will unlock.