Tsunayoshi Takeuchi was a Japanese manga artist born on February 22, 1922, in Yokohama, Kanagawa Prefecture. He made his debut as a cartoonist in the early 1950s after relocating to Tokyo in the years following World War II.

Takeuchi is best known for his pivotal role in the manga series Akado Suzunosuke. The series was originally conceived by Eiichi Fukui, a popular manga artist of the time, who serialized the first episode in the August 1954 issue of Shonen Gaho magazine. Following the publication of this debut episode, Fukui died, leaving the series unfinished. As a result, Takeuchi, who had only recently debuted as a manga artist, was unexpectedly assigned to continue the work. He took over writing and illustrating from the second episode onward, carrying the series through to its conclusion in the December 1960 issue.

The manga became a significant success, leading to a multimedia franchise that included a radio drama in 1957, nine live-action films produced by Daiei Film between 1957 and 1958, two live-action television dramas also in 1957, and later an anime television series that aired from April 1972 to March 1973. Takeuchi also wrote a novelization of the story.

Beyond Akado Suzunosuke, Takeuchi created several other manga series. One of his other notable works was Shonen Jet, which was adapted into a television series in 1960. His other credits include Kondoru Kingu (Condor King), Tokyo Patororu (Tokyo Patrol), Tatsumaki-kun, Yamabiko Kotaro, Kaze no Jirokichi which was serialized in Shukan Shonen Sunday in 1963, and Kumo Hime Osen (Osen, the Spider Princess), created with Studio Bell in 1973.

Tsunayoshi Takeuchi passed away from lung cancer on April 17, 1987. His career was defined by his work in children`s manga, where he was responsible for several popular series that expanded into other media during the early decades of Japanese television and film.