Springtrap

Springtrap is an early model of a Bonnie suit (as he is referred to as Spring Bonnie by the Phone Guy on Night 5 and by a kid in Night 4 Minigame of Five Nights at Freddy's 4).

He is a heavily damaged rabbit animatronic of a dirty olive drab color. A great portion of his right ear is missing with wires sticking out of the stump left behind. Springtrap's entire body is torn and tattered with gaping holes exposing caging and wires throughout, thus making Springtrap appear much more macabre-looking than any of the other animatronics from previous installments. While both hands and feet are attached and generally intact, his legs are entirely stripped from the mid-shin down, fully exposing endoskeleton metal and wiring. From his right hand, half of the middle finger is missing. Both of Springtrap's eyes are properly set inside his head and appear to be a pale gray. However, during his jumpscare, they seem to take a pale yellowish hue, although this could just be because of the lighting. A single button can be seen on his chest. While being an incredibly damaged version of Spring Bonnie, his bow tie is entirely missing.

He does not typically open his mouth - instead, Springtrap wears a permanent, wide grin as the material surrounding his teeth has deteriorated. The exceptions to this are during his second jumpscare, the main menu, on CAM 15, his rare boot images, and Scott Cawthon's "Thank You!" image.

Close examination of Springtrap and the rare boot images depicting him show that there appear to be human remains within the suit. When viewing the torso and other exposed sections of the endoskeleton, there are chunks of dark pink material that resemble human innards. In the boot images, Springtrap has his jaw open and is pulling the suit's head up, revealing a mummified-looking human head. The jaw and teeth of the head can be briefly seen during his second jumpscare and can also be seen when he's on CAM 15. It is revealed in the Night 5 minigame that these innards belong to Purple Guy after he was killed by the Springlocks within the suit.

Springtrap acts in a very human-like manner, teasing the player to his presence as if he were hunting them. He will go to more secluded areas of a camera area, seemingly attempting to hide from the player or outright stare into the camera. When around The Office, Springtrap will lurk around and even stare at the player through the window. On occasions when he is about to attack, he will peek in from behind the door, simply staring dead ahead at them. He will also briefly appear from the right, only to slink away from the peripheral vision.

As mentioned in the Night 2 phone call, Springtrap is susceptible to audio distractions and will constantly follow the source of the noise the player creates, possibly due to him mistaking the noise for the sound of actual children. He will only follow the sound when it is played in a close location to where he is. He is also susceptible to the vents being sealed, but will commonly use them as means of getting to the player. Springtrap may also be attracted to the sound of The Office's alarm blaring (when the light flashes red in The Office), and after the ventilation system is left with errors for too long, in which the player starts hallucinating and seeing multiple Springtraps in the cameras, and will soon be jumpscared by the actual Springtrap. Unlike the robotic movements of all of the previous animatronics, Springtrap moves in a fluid manner, slinking into The Office in an almost human-like fashion

William Afton is a sadistic and depraved serial killer. He shows no remorse when it comes to murdering his victims, all of whom were young children. He cared for nobody but himself and was an abusive and neglectful parent, having ignored Crying Child's torment from Michael Afton, and sending the Circus Baby animatronic (who is haunted by Elizabeth Afton) down into his underground rental facility to be tortured and experimented on, knowing full-well his daughter possessed it.

William is rather a master of manipulation, convincing them to believe anything he says. He does things that would only benefit himself and nobody else. He also seems to be an alcoholic and was banned from Jr's, implying that he would get incredibly violent and angry when drunk. Afton is an evil individual with no regrets for what he has done.

William Afton is a calm, manipulative smooth-talker, being able to convince anyone of almost anything. When he was around people, he was similar to Santa Claus in the sense that he was jolly, good-natured and affable. This is likely just a façade however put on by William to trick people into believing he is to be trusted.

Afton appeared to mentally unwell, as he had an unhealthy obsession about Henry and the animatronics during the time he was alive in his human form. He owned multiple journals which he filled with passages about Henry that varied from mild jealousy to near worship. It's likely that Afton was jealous of Henry's engineering skills as well as his happy family, giving him a reason as to why he killed Charlie.

William Afton is proven to be quite intelligent, as he was financially shrewd and knew his way around business, was able to design complex machines, and found a way to cheat death. He is also confident, determined, and scientific, as he studied remnant in order to become immortal. It is indicated that he has a fear of death, the most likely reason as to why he would want to become immortal was so he would avoid going to Hell and pay for his crimes