Chuck E. Cheese (Nights 1-5):

He will make his way to the door behind you. When you see him, close the door. Wait for at least a second after closing before you open it again. I'd recommend always using the flashlight to make sure he's gone.

He will always say something when he appears in the doorway. Here are all the things I've heard him say (Anything in brackets is me guessing because I couldn't tell what he said)

"Happy birthday to youuu"

"Hiiii there"

"Say cheeeese"

"I will noooot be replaced" (Night 5 exclusive)

Jasper T. Jowls (Nights 2-5):

He usually leaves his stage for the first time at the exact same time as Chuck. He will walk around for a bit before appearing in front of you, causing the lights to flicker and a buzzing sound. Hold down the stage call button until he goes back to his stage.

Helen Henny (Nights 4-5):

She usually leaves her stage a bit later into the night than Jasper and Chuck. She will move around a little bit before entering your room. She doesn't make a sound when she enters and she's very hard to see. She can appear on the far left or the far right. When she appears on the far left, you can only see the edge of her arm unless you move your mouse over to see her. When she appears on the far right, you won't be able to see her unless you move your mouse to the right. Hold down the stage call button until she leaves, which usually doesn't take as long as it takes Jasper.

Costume (Nights 2 or 3-5):

This is the second Chuck E. Cheese, the one that starts in the dressing room. Shortly into the night, he will appear in the dressing room. He will slowly make his way towards your office, and when he gets there you can't get rid of him and he will prevent you from closing the door until Chuck kills you. Watch him on the cameras to slow him down and hopefully prevent him from getting to you before the nights end.

Mr. Munch (Nights 3-5):

Occasionally, he will leave his stage. When he does, there's a chance he'll make a noise (a deep, garbled voice). You need to find him on the cameras as soon as possible or he will kill you. Sometimes it's hard to notice he's left his stage, so stay vigilant.

Pasqually (Night 5):

He never leaves his stage. Occasionally when you leave the cameras the little doors next to him will open slightly and his head will start shaking. When this happens, hold down the stage call button until it stops.

Crusty The Cat (The Basement):

I'm not entirely sure how the thing in the basement works, so here's what my strategy that works most of the time is:

Look for the items as quickly as possible. Every now and then, turn around and use the flash to find the animatronic. Now use the flash again in the place you just saw the animatronic. If you don't see it, just turn around. If you do see it, flash it a few times before turning around. Repeat until you've found everything.

Tips and Strategies:

If you are ever attacked by multiple animatronics at the same time, which happens often, prioritize the animatronics affected by the stage call. They go away the fastest and give you the lowest amount of time to react. Additionally, multiple of them can be dealt with at once. After that, deal with Mr. Munch (if he's attacking). Lastly, shut the door on Chuck.

When Helen leaves her stage, make sure to constantly check the sides of your office.

Never look at anything on the cameras besides the second Chuck E. Cheese animatronic, the one that is slowed by you watching him. Occasionally while looking at the cameras, stop looking to make sure Mr. Munch is still on his stage and Helen isn't in your office. As far as I know, every other animatronic has distinct audio cues you can listen for.

I hope this guide helped you!