Chica

The day, Chica appears as a joyful, harmless, nice, good-hearted and innocent robot, but the night, her persona turns into a considerably darker one's as she felt the urge to stuff the night guard into an endoskeleton suit. While chasing the player, she is a cunning and formidable opponent, albeit quite slow and considerably dimwitted as she makes lots of noise each time she goes into the kitchen.

In the original game, she is the only enemy besides Freddy who attacks from the right, and can only be seen in the window. Chica is pretty rare and will not come at the door to The Office very often. Chica will only appear once or twice a night; sometimes two, rarely three. Chica will come in quicker than Bonnie, in about 5 seconds.

This is why she looks at the player through the window, though gives away the opportunity to her coming in by opening the door to see if she is there.

Like Bonnie, her killing of the player will occur if she's outside and the door isn't closed in time before it is broken. Otherwise, checking the camera will lead to an attack from Chica.

Chica can also disable the player's lights and doors. If this happens, she's already in the Office, hiding. Checking the cameras will trigger her animation and end the game. It is advised to close the door immediately if Chica is seen, while briefly checking the cameras for her.

Chica, like her friends, attacks only because she is possessed by a dead and vengeful child that wants to avenge herself and her friends by killing their killer. However, she doesn't know how their killer looks like, only that they're a night guard (heavily implied by the SAVE THEM minigame). Because of this, she attacks any night guard, hoping that one day, she'll find the one person. She was lured and killed by Afton claiming that her dog isn't dead.

Chica is overall the most tragic of the original five animatronics, seeing as the way she was lured was the only one seen in-game.