Art for characters from 2021 named Ellie and Oswald that were going to appear in a prequel.

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.

sprite of the unused Billy character from the original 2020 funhouse

Elizabeth Afton's Clock (BLOODBATH teaser)

In 2022, Purpleman's funhouse: Bloodbath was in the works. The game ended up getting cancelled however.

"come little children"

Lockjaw (TRTF 3)

the insane jester and the mysterious murderer

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

Lockjaw unmasked