Benimaru is a young and well-built man of average height. He is fair-skinned with neck length, wavy, black hair that partially covers the front of his face. His right pupil is a red circle with a black dot in the middle, and his iris is also black; while his left eye has a red iris and a white X-shaped pupil, reminiscent of the tic-tac-toe game or the Japanese symbols for affirmation and negation. He normally carries a gloomy facial expression. 