The "faithful handyman" is played by Richard O'Brien, who also wrote the music, stageplay, and screenplay of RHPS. Still a busy artist, he has had roles in numerous works including Dark City, Ever After, and Dungeons & Dragons.
Some trivia: Born Richard Timothy Smith, he took the name O'Brien from his grandfather... Wrote "The Rocky Horror Show" in six months... Based the character Frank N Furter on musician Alice Cooper...