Shadow Milk Cookie is a spindly, average height Cookie with powder blue dough and two differently-colored eyes: one cyan right eye with a black slit pupil and black eyelashes, and one cerulean left eye with a white slit pupil and white eyelashes. His mouth is sapphire blue and sly, having teeth which change between straight and sharp depending on his emotions. About his right eye is a pale blue, claw-shaped marking. He has white locks of hair near his face — two that fall against his forehead and one slicked back — azure curled sidelocks, and glossy, sharp, long hair in a dual-toned shadow and lapis style that resembles the extents of a jester's hat. Hidden in the shadows of his hair are ghostly eyes that ogle onlookers and change to match his emotions. He calls himself "extremely handsome" from this. Shadow Milk Cookie wears an obsidian harlequin bodysuit with turquoise diamond appliques. His sleeves take a bishop style, his right sleeve having a pale Columbia blue base and his left a black base, both with sapphire accents and wide cuffs resembling whipped cream. The jester wears a ruff collar from which hang curling coattails with a ghostly blue lining and a black outside. Upon its lining are more gazing eyes. He wears his eye-like Soul Jam of Deceit as a brooch on his collar in the same place that Pure Vanilla Cookie wears his own Soul Jam. Shadow Milk Cookie was once a heralded champion of all Cookies, baked and empowered by the Witches, with him in particular being created by First Milk Cookie. He was granted the divine Virtue of Knowledge, becoming known as the Fount of Knowledge. However, despite his nigh-omniscient perception of the world, he saw how Cookies often shied away from bitter Truths and chose to believe in sweet Deceits instead.