Chainsaw Otoko, known in Japanese as チェーンソー男, is a notorious enemy in the Biohazard (Resident Evil) series, particularly in Resident Evil 4. He is a terrifying figure, clad in a burlap sack mask and wielding a lethal chainsaw. Playing the role of a mini-boss, he is infamous for his relentless aggression and the instant-kill potential of his weapon. His chilling presence and unique design have made him one of the most recognizable and feared adversaries among fans of the series.