Art of the flesh animatronics. They were most likely not for any games and they were just made for fun.

Lockjaw (TRTF 3)

fnaf world mod concept

Torture Lockjaw (TRTF 5)

Gron Takaliken / The jester during one of his hallucinations

At one point a game called The Fazbear Slasher was being worked on by Slashy, DARK_RABBIT, and Me. It took place in a original fnaf universe, separate from Funhouse and FNAFSTINE. The game was never finished however.

the insane jester and the mysterious murderer

the truck

Lockjaw unmasked

Elizabeth Afton's Clock (BLOODBATH teaser)