Freddy Fazbear is two morts, the first being an animatronic bear (A.I) and one of the children killed by Faulkner the who is controlled by a mort Wilhelm Faulkner, who was a manipulative and ruthless child serial killer who created Fazbear's pizza as a means to draw children in so he could kill them.
He forcefully stuffs any being he encounters after-hours into a Freddy Fazbear suit, as do the other animatronics (rather or not they want too), resulting in said person's death.
Freddy is an animatronic wearing a costume that gives him the appearance of a brown bear. Onstage, he wears a black top hat and bow tie, while wielding a microphone in his right paw. His ears are articulated and are thus able to move back and forth.
He has human handprints on his face (see picture below), though they are difficult to locate. His irises are normally of a light blue color, but he is commonly seen with his endoskeleton eyes on-camera, rather than his normal costume eyes.