Mogura Oyaji, alias Old Man Mole, is a seasoned mechanic and engineer with thirty years in the racing world. Partnering with the protagonist and Frisbee, he applies his mastery of engine tuning and chassis reinforcement to build the Trans Am 20000 WR for the Redline race. His quadruple arms allow swift, precise multitasking, while his encyclopedic knowledge of racing mechanics cements his reputation as an indispensable ally in cutthroat competitions.

Having mentored the protagonist and Frisbee since their fledgling days, he maintains a wary dynamic with the latter due to Frisbee’s underworld ties. Though he begrudgingly respects Frisbee’s technical prowess, distrust lingers. A pragmatist at heart, he sporadically pushes to arm race vehicles for survival against events like Redline’s brutality, though his proposals are overruled in favor of pure speed.

Initially resistant to Frisbee’s unorthodox engine design during Redline, he eventually capitulates, a decision that proves critical. When retaliation looms, he neutralizes a mob boss and crew to shield Frisbee, unveiling an unexpected loyalty beneath his abrasive facade. Prone to drinking on the job, his habit culminates in an accidental explosive detonation during the race’s final moments—a blunder that inadvertently launches the protagonist to triumph.

White-haired and red-eyed, his weathered bearing mirrors decades in the grit of underground racing. While his origins are unstated, his morally nuanced choices and no-nonsense ethos reflect a life shaped by the perilous demands of the circuit.