Gōtarō Katsuragi works as a producer at Western Entertainment, often collaborating with Shun Watanabe and Musashino Animation on projects. He possesses a chubby build, gray eyes, brown hair cut to ear length, and typically sports glasses and a belt.

Four years after the original series, in the film sequel, Katsuragi spearheads Musashino Animation's new project, *Air Amphibious Assault Ship SIVA*, following the cancellation of *Time Hippopotamus*. He recruits Aoi Miyamori to lead production after GPU fails to deliver completed storyboards, stressing the project's tight deadline and budget constraints while urging its completion. Later, Katsuragi alerts Miyamori and Watanabe that GPU's president, Yoshio Misaki, falsely claims joint production rights to *SIVA*, threatening progress. He backs the team's confrontation with Misaki, where they cite contractual violations to resolve the dispute.

The etymology of his name reflects traits associated with his professional demeanor: "Gōtarō" combines "sturdy, strength, robust, tough" (剛), "thick, big, great" (太), and "son" (郎), while "Katsuragi" means "arrowroot" (葛) and "castle" (城).