Millie is a compact, pear-shaped imp standing just over 4 feet tall. Her skin is a vibrant, matte red with smooth texture except for faint burn scars along her left forearm, telltale marks of past close encounters. Two thin, black horns, striped with jagged white bands, curl back elegantly from her forehead. Her short, charcoal-black bob is messy, with choppy bangs giving her a perpetually rebellious air. Her striking yellow sclera eyes, framed by thick, long black eyelashes, glint with mischievousness and a hint of danger; beneath her right eye lies a small, delicate beauty mark. Her front teeth show a small gap, a charming imperfection. A black heart tattoo rests on her right shoulder, contrasting with multiple pure white spots on her upper right arm, upper left leg, and two on her long, devilish tail ending with a white tip spot. Her attire is a striking all-black ensemble accented with golden-yellow: a black choker, a cold-shoulder crop top barely covering the midriff held up by golden-yellow buttons, fingerless gloves, torn black denim pants, and toeless footwear revealing sharp, hoof-like toes. Millie moves with restless energy, rarely standing still, combining the nimbleness of her imp heritage with raw, bruising strength. Unexpectedly, despite her violent capabilities, she constantly hums old nursery rhymes in a soft, almost childlike tone when alone.