Hey Ho is a recurring enemy character in the Super Mario series, often called a Shy Guy in some Western contexts, though in Japanese the name ヘイホー refers to a distinct mask-wearing enemy. The character appears in games related to Super Mario Brothers as a common obstacle for Mario and his allies. Hey Ho usually serves as a minor antagonist, acting as a foot soldier or stage hazard rather than a major villain. It is known for its simple, masked appearance and playful, sometimes mischievous behavior.