It would seem as though they are haunted. Here's what I read on Wikipedia... "Freddy Fazbear's Pizzeria was once a 人気 restaurant, but its fame declined after five children went missing, having been lured backstage によって a man in a Freddy Fazbear suit and murdered. It is 発言しました that the culprit was captured, but the children's bodies were never recovered. The restaurant was threatened with closure and their reputation was tainted. Later, concerned parents contacted the Health Department over sanitation issues. The mascots apparently gave off a very foul odor, with what appeared to be blood and mucus around the eyes and mouth. Because of the threat of closure from poor sanitation, as well as the infamy gained from the murders, the restaurant is unable to find a buyer and will close によって year's end. It is therefore implied that the children were forcefully stuffed inside the animatronics and left to rot over the coming years, and the mascots now haunt the establishment because the childrens' souls have possessed them. Since the original killer had access to backstage and costumes, and that the mascots seem to attack the security guards, it is also implied that the original killer was once a night watchman at the restaurant."
I don't really think there's a backstory to the animatronics. The phone guys basically stated they're programmed to not let any exoskeletons not have a suit, which is why they stuff あなた inside. However, I do think the animatronics have human like feelings. But their feelings are programmed as well as their ways. However for Foxy... Foxy is scarred from the bite of '87, which is why he hides in Pirate Cove. He fears that the other animatronics will beat him up if he leaves, as explained によって his exoskeleton being shown in his legs that they have previously beat him up. But if あなた keep the camera on him too long, he thinks somebody is giving him respect again, and sprints to the security room only to find out it is and exoskeleton. Enraged, he does as all the other animatronics do, he kills the player.
Well there haunted my theory is that they come after あなた because they are angry with adults so they come after あなた and with foxys good thing maybe he wasn't murdered によって an adult my theory is the kid died because he got a ハート, 心 attack because of one of the animatronics scared him the same way he may accidentally kill あなた and the overs kill あなた によって the way they got killed like when toy bonnie jumps on あなた maybe some one jumped on the kid and killed him
Well the "Purple Man" killed the children right?. The animations (the souls of the children) have the image of the man in their mind..which means When Mike is working at Freddy's pizzeria for the night shifts. The animatronics (souls..) are seeing Mike as the Purple man. So that causes them to try to kill あなた in the game.For revenge.. Because from what they see .. Your the purple man..Not literally but from their eyes they see あなた as the purple man. :I (might be confusing hard to explain) XD
Children's souls haunted the animatronics also remove Google plus remove twitter remove フェイスブック and remove DMCA and remove eula and remove nsa and remove the 安全, 安全です harbor worshippers and it's terrible acts and remove 林檎, アップル technology and remove Skype and remove Microsoft technology and remove netflix and remove DRM and remove Hulu and remove red box and remove the ndaa and remove all copyright acts and remove all the utility bills and insurance commercials and remove all the taxes and fees and remove mpaa and remove riaa and remove IRS and Remove Fbi and remove Sony and remove ACTA and remove COPPA and remove AOL and remove ACA and remove Verizon and remove AT&T and remove etrust and remove FOIA and remove adobe and remove Spotify and remove TPP and remove governments and remove congresses and remove FDA and remove DEA and remove ACLU and remove verisign and remove Kindle and remove nook and remove Mozilla Firefox and remove safari too and save the link from the FCC and remove TRUSTe and remove EME and remove PPACA and remove Obamacare and remove HIPAA and remove CETA and remove TIPP and remove TPP and remove TTIP and remove TISA and remove TTP and remove RTI and remove CALOPPA