Kojiro is a tall young man who is large and muscular in stature, possessing very wide shoulders in comparison to his slender waist and unusually sizeable hands. Described as a gentle giant, Kojiro has been shown to be a "shrinking violet" in comparison to the rest of his classmates, similar to Koji Koda from Class 1-A. He often tends to stammer when speaking with people but gets along with them just fine anyways.