Oleg Zaytsev is a martial artist defined by a muscular physique, light grey hair, and cyan eyes, with scars accentuating his appearance. He competes as a fighter in the KODOKU underground tournament, notorious for a lethal approach that has claimed opponents' lives during matches. His combat style relies on overwhelming physical force and aggression, driving him to the tournament finals. There, he confronts Juzo Fujimaki, initially dominating the bout until Juzo deploys the "Tiger King" technique—a decisive, unconquerable move sealing Oleg's defeat.