Okabe is a lanky young man, with a square jaw and bony cheeks. His short black hair is swept back. He has a small amount of stubble on his chin and cheeks. His eyes are brown. Rintaro often wears a long white lab coat, over a plain white T-shirt (light gray in the anime), and khaki-colored slacks. The breast pocket of his lab coat has a red pen sticking out, and around his slacks he wears a black military-style canvas belt, with a gold-colored buckle. He has dark socks and wears green slippers. 