He is portrayed by actor Gaku Hamada in the 2014 TV Drama Aoi Honō based on the autobiographical manga by his fellow Kazuhiko Shimamoto.
He has written several Japanese-language books on otaku culture, and lectured on the topic as an adjunct instructor at University of Tokyo from 1996 to 1997.
Okada was admitted to Osaka Electro-Communication University to learn to use computer in 1978, but he could not obtain any credits in the first year because he had forgotten to hand in his course registration form.
For this reason, he stopped completing all the courses necessary for a university degree, and he joined a group of SF fans and went into its activity.
On February 14, 1982, he opened "General Products" as a part of his parents company to sell SF Goods in Osaka.