Here I will tell you about the special Animatronics that don't show often.
Spring Trap:He is the main one in FNAF  3.You draw him away using the audio cue, of a child saying 'Hello!' that sends him to the room farthest from the office.
Bon-Bon : This is the Bonnie hand puppet from Sister Location. In the mini game Fun-Time-Freddy will send him to attack from left or right. If you hear "Bon-Bon attack!" From the right shut the right door. If Freddy mentioned​ a surprise close the OPPOSITE door from where you heard the voice. So if you here from the left " Bon-Bon he's in for a SURPRISE!" Close the RIGHT door!
Mini-rena's: These are from the actual Sister Location. While tightning springlocks these small Baloras will crawl on the suit. They may seem harmless but BEWARE! If one crawls onto your face it WILL jumpscare you. You must shake the suit, to get the ones climbing the face side and chest off. Caution:You must tighten the locks often or the suits mechinsm will impale you thus ending the game.
Ennard:He is the female voice that guilds you through Sister Location when your AI is offline. Beware! This is Ennard using Baby's voice to lure you to your death. She/He always says " I'm good at pretending.". And at the end " Didn't I tell you I could pretend?" At the very end with the regular ending she/he will lead you to the scooper room where you are killed and Purple Guy is found to not be dead, and he is you, and Ennard takes your skin as a suit. In the secret ending ( earned by completing the Baby cupcake mini game) you will ' Enjoy some time at home!' But Ennard will inch across your screen as it fades to black, thus ending the game.That is known as the 'secret ending'.