The Puppetmaster is a cut antagonist from the legacy Aperi Oculos series. He was to appear with the same skin as The Protagonist, and was meant to be the series creator himself. The Puppetmaster had complete control over what would happen to the Protagonist.
While not directly seen himself, the Puppetmaster does communicate to the audience in REFRESH, and is most likely the cameraman. He speaks in a similar style as the Protagonist, and uses the Courier New font.