Spring trap

Springtrap is a tattered, formerly yellow springlock animatronic rabbit with olive green tints, notably on his stomach and ear insides. Like with the Withered Animatronics from FNaF 2, Springtrap appears to be in heavy disrepair, evident by the multiple tears throughout his body and wires poking out of his arms and legs. He has one black button on his chest. Furthermore, Springtrap contains several pieces of human innards wrapped around his body. Upon close inspection, it is revealed that Springtrap is holding the corpse of William Afton, the man responsible for the Missing Children Incident.Springtrap was originally a Spring Bonnie suit that doubled 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.