The character known as "Boss" leads the Yokohama motorcycle gang Kentauros (also called Centaurs). He stands out visually with his unique attire. The gang's name and identity draw from the mythical Greek centaurs, featuring this motif on elements like their biker jackets. As leader, Boss is central to the gang's activities, prominently involving motorcycle racing and gang clashes. Under his direction, the Kentauros engage in exploits, including attempts to join organized races. Boss, along with members like Lady and Crazy Arthur, is directly inspired by real individuals from the actual Kentauros motorcycle gang that existed in Japan.