Mister Demi has white hair just above his shoulders. Two pencils rest on his head alongside small horns. He has green rectangular pupils and wears black rectangular glasses. His black and white striped arms end in black hands, and his left bang looks like a keyboard. Mister Demi's black and white attire complements his unusual features. A white collared t-shirt with musical notes completes the look alongside black boots, pants, and suspenders.