He and I played judo at the same dojo, so his interest in my character was more than a passing one… Reagreed to give me a shot and publish Judomaster, and that's when it hit the fan".

[2] Hadley "Rip" Jagger, a sergeant in World War II in the United States Army.

He rescued the daughter of a Pacific island chief and in return was taught the martial art of judo.

A female Judomaster, Sonia Sato, was introduced in the Birds of Prey series as a member of the eponymous group who can project an "aversion field" that protects her from attacks specifically aimed at her.

The Sonia Sato incarnation of Judomaster appears as a character summon in Scribblenauts Unmasked: A DC Comics Adventure.