Robby has an anatomy similar to that of a stick figure, with lanky black limbs. He has black fluffy hair with a pale blue and red propeller hat. He also accessorizes black glasses. Like most characters, he lacks a neck. He sports a black collared T-shirt, with a large front pocket. He has three claw-like fingers, and often wields a wrench in his left hand. His attire is finished with black shoes.