Oneman
Oneman is a term that can refer to a single person who performs, operates, or is responsible for all aspects of a task or project. In everyday use, it is often written as one-man or one-man band when describing a musician who performs multiple roles or instruments alone. The unhyphenated form oneman can function as a stylized or branded name in various contexts, including stage names and commercial branding.
In popular culture and media, oneman is sometimes used as a proper noun, serving as a stage
Etymology: the term derives from the phrase "one man," which denotes a single person, with its uses
See also: one-man band, solo artist, mononym, sole proprietor, solo operation.