Shadow Milk Cookie is a Cookie with powder blue dough and differently-colored eyes: one cyan, one cerulean. His mouth is sapphire blue. He has white and azure hair styled in a way that resembles a jester's hat, with ghostly eyes hidden within. He wears an obsidian harlequin bodysuit with turquoise diamond appliques and a ruff collar with curling coattails. He carries a black staff with blueberry-shaped details. Milky strands of ectoplasm drip from his body.