Osamu is 17 years old and his height is 183.8 cm or 6' 0" while his weight is 74.5kg. He is a sophomore at Inarizaki High School from Hyogo Prefecture, plays the position of a do-gamer, and is also the twin brother of Atsumu Miya. He has a large build, and looks very similar to his brother, which suggests that they are most likely identical twins. Osamu's hair is dyed gray, and his bangs are pushed to the left side.Osamu seems to be more quiet and unperturbed than Atsumu,But he can also be angry