Possible Skins for the Shadow Animatronics:

Shadow Bonnie - How Black Rabbit appears in the Popgoes Games. (If even allowed)

Shadow Freddy - His green and mouldy, eyeless rendition from Fnaf 3.

Possible Skins for Nightmare Fredbear and Nightmare:

Nightmare Fredbear - His miscoloured variant from the Help Wanted 1 trailer, having the colours of Freddy Fazbear.

Nightmare Fredbear - His miscoloured variant from that one Fnaf 4 Teaser, only showing off his purple bowtie and purple hat, the rest of his model being in Greyscale.

Nightmare - A partly translucent variant.