Go Nagai is the pen name of Kiyoshi Nagai, a Japanese manga artist and creator born on September 6, 1945, in Wajima, Ishikawa Prefecture. He is recognized as one of the most influential figures in the history of manga and anime, having pioneered several major genres and created iconic works that have shaped popular culture both in Japan and internationally.

Nagai's path to becoming a creator began after a health scare during his preparation for university entrance exams. Believing he might not have long to live, he decided to pursue his childhood passion for drawing manga. He became an assistant to the legendary manga artist Shotaro Ishinomori, creator of Kamen Rider and Cyborg 009, before making his professional debut in 1967 with the short comedy Meakashi Polikichi.

His first major success and a turning point in the industry came in 1968 with Harenchi Gakuen (Shameless School). Serialized in the newly launched Weekly Shonen Jump magazine, the series introduced overt eroticism and crude humor into manga aimed at a young male audience. It became a massive hit, helping Shonen Jump sell over one million copies per week, but also sparked significant controversy. Parent-Teacher Associations and other groups publicly protested what they saw as vulgar content, and Nagai became a frequent subject of televised debates. The controversy ultimately cemented his reputation as an artist willing to break taboos. In 1969, he founded his own production company, Dynamic Productions (later Dynamic Planning), with his brothers to manage his growing body of work.

Over the following decades, Go Nagai proved to be an extraordinarily prolific and innovative creator, responsible for originating several enduring genres. With Mazinger Z (1972), he created the template for the super robot genre by designing the first giant mecha piloted from within a cockpit by the hero. The series was a commercial phenomenon and established the model for toyetic multimedia franchises. In the same year, he launched Devilman, a dark horror manga about a young man who merges with a demon to fight against his own kind. Devilman is widely considered a foundational work of dark fantasy and psychological horror in manga, noted for its apocalyptic scope, graphic violence, and tragic themes. Also in 1972, he created Cutie Honey, an android superheroine who could transform her appearance, which became a landmark work that helped pioneer the magical girl genre, albeit with a more action-oriented and ecchi-infused tone.

His other significant creations include Violence Jack, a post-apocalyptic sequel to Devilman; the combining robot series Getter Robo (1974), created with artist Ken Ishikawa; and UFO Robot Grendizer (1975), known as Goldorak in French-speaking countries, which became a massive international hit, particularly in France and the Arab world. A recurring element in Nagai's work is the blending of genres, often combining extreme violence, dark fantasy, science fiction, and provocative sexual humor. His artistic identity is defined by dynamic, energetic linework, monstrous and grotesque creature designs, and a willingness to explore mature themes.

The list of anime adaptations based on his original concepts is extensive and includes many of the titles mentioned, such as Abashiri Ikka The Movie, Amon: Apocalypse of Devilman, Anime V Comic Rentaman, Bio Armor Ryger, and Black Lion. His company, Dynamic Planning, is frequently involved in the production of these adaptations.

Go Nagai's industry significance is monumental. He is credited with directly creating or popularizing the super robot, post-apocalyptic, and ecchi genres, while also making crucial contributions to magical girls and horror manga. His work on Mazinger Z laid the commercial and conceptual groundwork for the modern anime industry's business model. Despite the controversial nature of some of his early work, he has received numerous accolades, including the Kodansha Manga Award for Susano Oh, the Diamond Grand Prize at the Japan Movie Critics Awards, and the Minister of Education, Culture, Sports, Science and Technology Award for his entire body of work. A museum dedicated to his career was opened in his hometown of Wajima in 2009. He remains an active and revered figure, often appearing at international conventions and continuing to inspire new generations of artists and storytellers.