The former yakuza boss and Kensuke Hagane's idol. After a failed assassination attempt on rival Masashirenbo, he is imprisoned for seven years. Upon release, he is betrayed and shot alongside Hagane. His heart and distinctive back tattoo are surgically transplanted into the cyborg Hagane. Though deceased, his memories and physical parts play a central role in Hagane's transformation and motivations.
Tosa is Kensuke's admired former boss and defining model.
Kensuke Hagane is described as an aspiring yakuza who idolizes Tosa and welcomes him after his release from prison.
Their broken relationship remains central to Yukari's emotional life.
Tosa abandons his girlfriend Yukari before attempting to kill Masashirenbo, and Tosa's memories reveal Yukari's disappointment in him.
Explore the full interactive character relationship map of Full Metal Yakuza