Koko has a lean build and medium-tall stature. He has black hair in the style of a death hawk that falls loosely to the right side of his face. He has ferocious, piercing black eyes and high, arched eyebrows that give his face a perpetually angry look. He often wears fancy clothes. He perceives the world as a series of calculations, acting solely in his own interests: his every step is aimed at obtaining profit. He associates with those who are more powerful than himself.