you ever noticed how Vac isn't on the stage camera? this might be a hint.

Vac's eyes are red during his jumpscare, something many other characters do not have, expect snorky, i think. (which might hint toward the red eyes being blood, far fetched)

Vac comes through a hole in the wall, which might hint toward him being abandoned.

vac's body does not simply make sense. it makes sense with Cuckoo, since she is literally just a clock.

Vac's eyes look misplaced during some of his poses, which might hint toward the eyes being broke (another abandoned theory)

Vac Does not simply look "funky"