Mirio is a tall young man with a very muscular build who possesses a number of noticeable scars around his lower arms. Mirio's design is very unique due to his blue oval-shaped eyes, drawn in a simplistic style with no visible sclera, and nose which is prominently rounder than most others. He has blond hair, the top part of which is arranged in a cowlick, while the bottom section is worn swept backward.