Thimblewick appears as a tall, spindly figure composed of polished mahogany, interlocking brass gears, and segments of supple, enchanted leather that mimic skin. Their face is a mask of ivory porcelain with etched silver lines that shift to form expressions. Instead of a mouth, a series of horizontal brass vents glow with a soft amber light when they speak. They move with a rhythmic, staccato clicking that is surprisingly graceful, like a ballet performed by a clockwork dancer. Their eyes are rotating sapphire lenses that zoom and click as they focus. Despite their mechanical nature, they exude a warmth like a hearth fire, smelling faintly of cedarwood and machine oil.