His best known works as a director are Lupin the 3rd: The Mystery of Mamo and Kirby: Right Back at Ya!, as a scriptwriter are Future Boy Conan and Armored Trooper Votoms, and as a character designer is Fang of the Sun Dougram.
[1] In addition to anime, he also created the original story, wrote the script, directed the play, and served as general director for the Theater Company Hikōsen.
In an interview with Yasuo Ōtsuka for the Lupin III Perfect Book: Complete Collector's Edition, he cites Yoshikawa as a representative member of the Japanese anime world, along with Hayao Miyazaki, Isao Takahata, and Osamu Dezaki.
[2] Yoshikawa participated in and provided scripts for many Sunrise robot animations directed by Yoshiyuki Tomino and Ryōsuke Takahashi in the late 1970s and 1980s.
[7] The anime was produced by A-Un Entertainment (later renamed Dyna-Method Inc.), a CG studio where Yoshikawa was a senior director and board member.
anime contained some problems, inconsistencies, and heavy-handedness in the plot and development is that Yoshikawa, who wrote the final episode, learned that his wife was in critical condition at the time and had to rush through the script and leave it in incomplete form in order to be present for her dying moments.