Mirio is a tall young man with a very muscular build who possesses a series of notable scars around his arms. Mirio's design is very unique due to his oval-shaped blue eyes, drawn in a simplistic style with no visible sclera and prominently more rounded nose than most others. He has blonde hair whose top part is arranged in the shape of a hood, while the bottom section is swept back. In his school uniform, Mirio dresses like most of the male students, without the jacket.