What I found out:

NickCat (the cat obviously, the animatronic):

He activates on Night 1. You can use the ‘shock a bot’ button to stun him. If he gets in CAM 13, the office entrance, you must IMMEDIATELY turn the lights off. Watch the vents and activate the fan if he gets in one. All the vents lead to your office, so it’s death if you don’t block a vent.

The Legless (phantom Rabz)? I think that’s his name. If you see him on the camera, IMMEDIATELY look away by switching the cam or lowering the monitor. If he gets in, he will cause the ‘shock a bot’ button to have an error, along with the ‘lights off button’ too. To get rid of him from the office, you must reboot the light button or the shock button. Another way is just clicking the ‘reboot all’ button.

I haven’t encountered any other phantoms yet for some reason. Well the non-lethal ones.

The Eyeless (Phantom Bizy). Unlike Rabz, he is a LETHAL phantom, so him jumpscaring you, kills you. In CAM 14, the music room, you must wind the music box to keep the music playing. If a blue icon indicator appears, or Bizy reaches out of his box, you must switch the song in the music room by pressing either 1, 2, 3, or 4 on your keyboard. An easy way to switch the song is pressing these keys randomly, to make sure you actually switched the song instead of keeping the original one.