Animatronics

Animatronics are the main antagonists of the game. Over the course of every night, they started to wander around the whole restaurant.

Behaviors
Piglet, Patrick, SpongeBob, Rigby and Mordecai are the main antagonists. There's a mysterious Golden Piglet suit who is actually the golden version of Piglet, strangely appears in Monday and Wednesday.

As they all do, George mentions that they are all set into "free-roaming" mode during nights. They all are strange animatronics who never regonizes the player as a person, but as an empty endoskeleton without a costume on. George says that won't be so bad when they stuff the player into a suit until Thursday.

History
All the animatronics were actually been controlled by five dead children who is murdered by the Purple Guy. Before being stuffed, their bodies were never actually been recovered. The purple man who killed them is unknown whether or not been sent to jail for crimes.

Not long after stuffed, the animatronics was activated and it turns out that they are normal during the day and becomes a murderer during the night. George also mentions that they are also able to wander the day until the Bite of '97 happens. Whoever causes the bite of 97 is currently unknown.

Golden Piglet
Whoever is stuffed into Golden Piglet suit is recently unknown, and it's not going to be any of the children(there're five of them). But some fans mentions that the person who is stuffed into it was the purple guy, as the animatronic was trying to get their revenge on him, or maybe weirder incidents.

Why is Rigby's Suit Tattered
Among all the animatronics, Rigby is the most tattered. This is currently unknown why is he so different with the others. There were many reasons about the tattered suit: Unfortunately, there's no official reason. The reasons above might be random in times.
 * 1) Rigby bang something that damages his robotic fur.
 * 2) Being discontinued.
 * 3) Get hit by Piglet after created the Bite of 97.
 * 4) Stayed too long at the Stone Place.

Endoskeletons
In the game, all animatronics were controlled by endoskeletons. The endoskeletons(excluding Rigby's) all come tailless, have uncolored eyes, and has a thin body.

And it seems that the only animatronic that carries endoskeleton eyes nearly everywhere is Piglet. Even attacking, one of Piglet's eyes will turn into an endoskeleton's instead of his normal eyes. The endoskeletons in this game were very similar to the one in Five Nights at Freddy's, except that this game's in cartoon mode, and the one from FNaF is more realistic.