Goldenduo

Summary
That CC and Cassidy possess Golden Freddy.

Proof
Crying child's favorite toy is a golden freddy plush, presumably linking him to Golden Freddy.

The two souls possessing stitchwraith, jake and andrew,jake can see (CC can't see, but Cassidy might)

andrew cannot.

Counterproof
We don't know for certain if the Fazbear's Frights books are meant to be a precise parallel to CC and Cassidy.

CC loved the plush Fredbear, but was terrified of the actual animatronic and was only close to him because he was dragged there kicking and screaming by some older boys.

Jake and Andrew initially started out possessing separate objects, which only changed because they were physically stuck together.