Mikio Dojima is the uncle of Daisuke Dojima, who permitted Daisuke to relocate into his Shibuya residence for schooling. As a doctor, Mikio practices comprehensive medical care, reflecting his personal traits of knowledge, courage, and trustworthiness. When the Shibuya Drift incident displaced residents, Mikio stayed in Shibuya with Daisuke and others, offering stability and guidance amid the crisis; his medical expertise likely aided disaster response, though specifics remain unelaborated. Mikio uniquely reasons with Daisuke, serving as a stabilizing influence whose perspective Daisuke respects during moments of stress or poor judgment. Physically, he shares a familial resemblance to Daisuke, including black hair, and wears yellow glasses with a tiny chin moustache.