Springtrap

Springtrap, previously known as Spring Bonnie and William Afton, is the main antagonist of Five Nights at Freddy's 3 and the withered form of Spring Bonnie. He is possessed by William Afton, and becomes a staple character in the series after his debut.

Springtrap's suit is an early model of a Bonnie suit, referred to as Spring Bonnie by Phone Guy on Night 5 and by the girl in the Night 3 minigame of Five Nights at Freddy's 4.

Springtrap is a heavily damaged rabbit animatronic/springlock suit of a drab olive color, with darker colors on his stomach and the insides of his ears. A great portion of his right ear is missing, with a single red wire sticking out of the stump. Springtrap's entire body is torn and tattered, with gaping holes exposing wires, endoskeleton and parts of William's corpse caging throughout, thus making him appear much more macabre-looking than any of the other animatronics from any previous installments in the series. His dark colored nose has an irregular squarish shape due to deterioration. While both of Springtrap's hands and feet are attached and generally intact, his legs are entirely stripped from the mid-shin down, fully exposing the endoskeleton, wiring and metal. Several of his finger joints from each hand are missing their suit overlays. The middle and little fingers of Springtrap's right hand are notably missing their fingertips. A single black button can be seen on the middle of his chest. If one looks closely at the large hole in Springtrap's chest (which is located under his button), there are multiple red streaks, presumably remnants of William Afton's corpse.

Springtrap was originally a Spring Bonnie suit that acted as both an animatronic and a costume suit. It was used along with another similar suit called Fredbear in the Fredbear's Family Diner.

After Fredbear's Family Diner is closed down due to a certain accident, the restaurant chain renamed itself to Freddy Fazbear's Pizza, and stopped using Fredbear and Spring Bonnie due to them being very dangerous to use because of its faulty springlocks. The suits are kept in the safe room in the restaurant that no one is allowed to access.

As shown in the FNaF 3 minigames, William Afton who had found out there are souls trapped in the animatronics, came back to the pizzeria that has been closed down to destroy Freddy Fazbear, Bonnie, Chica and Foxy. The souls were freed from the animatronics, and cornered William Afton into the safe room. Trying to protect himself, William put himself into the Spring Bonnie suit. However, as the room was wet due to rain drops, the faulty springlocks in the suit started to malfunction and snapped, severely impaling William and killed him, becoming the now-known-as Springtrap.

30 years after the FNaF 1's Freddy Fazbear's Pizza closed down, a new horror attraction called Fazbear's Fright was built as an homage to The Missing Children Incident and other incidents that made Freddy Fazbear's Pizza infamous for being haunted. After Night 1 and before Night 2 in FNaF 3, the employees of Fazbear's Fright found Springtrap in the FNaF 1's pizzeria. Thinking it was a real animatronic, they brought him into Fazbear's Fright. Springtrap came back alive from death.

It is unknown how William Afton haunts Springtrap - it is speculated that his consciousness is somehow inhabiting the suit.An alternative theory is that his corpse was reanimated after dying - which would explain how his suit in FFPS is different as he may have switched it after the third game.Another theory is that William haunts the endoskeleton which can be removed from the suit (again explaining how William has a different suit in FFPS, while also explaining how the animatronic parts move.)

Some people have assumed that the moaning noise is William Afton inside of Springtrap trying to talk.The sound had been roughly and/or vaguely deciphered where it can be assumed Springtrap is saying "Help me". As to whether this is intentional or not is unknown.

He is named after the trap device of the same name which is used for catching animals during hunting and how he is a springlock suit.