>>3046600>>3046626No, it's basically a jokey fanon thing that people ran with. He's part of a gang with a traditional Japanese martial arts aesthetic (Minato-kai) and a rival gang (NG Boys) tries to secretly facilitate a gang war between Minato-kai and a third gang, Siguma Squad, by beating up Siguma Squad goons and forcing them to wear blue fundoshi as a signifier that Minato-kai were behind the attack. Artists thought it would be funny if Minato-kai dudes did actually wear blue fundoshi, hence the art.
