Kōjiro (黄白, Kōjiro; Lit. "Yellow and White") is a young Shinobi who hails from Amegakure, and one of the most evident friends of their Kage's right hand, Aojiro. As a result of this connection, he has been placed within the ranks of their militia, specifically their Medical Division. He is also the younger brother of Takahiro, the personal Doctor of Izaya, as well as his assistant within various matters in regards to medicine. A shining example of a young medical-nin, Kōjiro is known as Bandage Scarf (包帯襟巻き, Hōtai Erimaki).