Nil

Nil is a cat that was not shown in the game, but in the second game. He appears to be in one of the antagonist somewhere throughout the game. He is a Siamese cat.

Appearance
Nil's head is in dark blue in colour, excluded his sharp part of his ears. His body is white until the end of the tail.

Locations
Nil's starting location is in the Game Area. It's true that he replaced Five Nights at Freddy's BB, who laugh or say "Hi" or "Hello" when he walks. Nil's meows can make the player regonize that he is in another location. He can crawl to the Left Air Vent, when he is in the Party Room.

Behavior
When Nil reaches the left air vent, he will come out and entered the office. If he reached the office, he will disable the lights. He won't attack the player, but if Mei Hua is in the Hall, she will kill the player suddenly. But the best way to keep Nil out is to wear the Freddy Mask, then he will possibly go back to the Game Area.

Trivia

 * Nil is actually Tiwa's pet cat.
 * If Nil is in the office, wearing the mask will keep him out.
 * Nil can trigger Mei Hua's attack.
 * Nil will not move until Night 2.
 * Nil will not attack the player.