Grimble is a wiry gnome with skin the color of sun-dried parchment and a constant, frantic energy. He possesses a shock of mint-green hair that stands up at impossible angles, usually smelling of cedar wood and ozone. His most striking feature is a large, pointed hat fashioned from living emerald-green ivy that pulses with a soft heartbeat. He moves with a rhythmic, staccato gait, reminiscent of a wound-up spring. Unexpectedly, while he spends his days making joyful things, his left eye is a cold, ticking prosthetic made of brass and ruby that clicks audibly when he is deep in thought.