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.

Benimaru's outfit consists of a white t-shirt with a black vest over it, a dark-blue kimono upper-garment that he only wears on his left arm, and the Special Fire Force uniform trousers that he tucks into his black boots.

Benimaru is quite passionate about the worth of free will and despises the dogmatic faith of the Holy Sol.