Gosaku Ōta was the pen name of Junichi Ota, a Japanese manga artist born on March 16, 1948, in Kaminoyama, Yamagata Prefecture. He began his career in the manga industry as an assistant to the legendary creator Shotaro Ishinomori, known for works such as Cyborg 009 and Kamen Rider. Ōta made his professional debut as a mangaka in 1969 with the shōjo manga Bōifurendo yai! (Hey boyfriend!). He later became a key collaborator within Dynamic Productions, the company founded by another prominent manga artist, Go Nagai.

Ōta is perhaps best known for his creative partnership with Go Nagai. Together, they co-created the original manga Groizer X, which was later adapted into an anime television series. Beyond this original creation, Ōta was responsible for drawing the manga adaptations of several of Nagai's most famous anime franchises. These include series that defined the super robot genre, such as Mazinger Z, Great Mazinger, Getter Robo, UFO Robo Grendizer (also known as Goldrake), and Steel Jeeg. His manga versions of these stories often ran concurrently with their anime broadcasts and sometimes featured unique plot elements, character designs, and endings that differed from both Nagai's original manga concepts and the animated adaptations.

In addition to his work on mecha series, Ōta created original manga across different genres. He produced the fishing-themed manga Tsuri Baka Taishō (Master of Fishing), which was collected in ten tankōbon volumes, and the shōnen series Mach SOS. From 1981 to 2019, he was a longtime contributor to the newspaper Sports Nippon, for which he created fishing-themed comic strips. Gosaku Ōta passed away on December 12, 2022, at the age of 74, due to pneumonia resulting from a COVID-19 infection. His career left a significant mark on the manga industry, particularly through his visual interpretations of classic super robot stories and his long-running original works.