Service-man  

, サービスマン

The character you're referring to is a recurring figure in the series. They have a unique appearance - their entire body is covered by a large sheet, except for their arms, legs, and a small strand of hair resembling Chinese martial artists. Their name can be found written on their forehead. This character appears to be a parody of a common trope in manga and anime known as "fan service." They attack using various methods such as lifting the sheet to reveal controversial body parts or slamming those parts into their enemies, which may be considered flashing.