Purple has big cartoony eyes, a circular head, and purple stretchable arms. Their jumpscare shows them having sharp teeth. Their full appearance in official merchandise reveals that they have a slender body with four long limbs with hand-like appendages and a flat face that conceals their mouth, explaining how their face fits against the vent and yet also is still hidden. Judging by the fact that they move through vents with their body mostly hidden, it's possible that Purple has a shy nature.