Shige Ishikawa is a wealthy Japanese businessman who owns multiple companies. Ishikawa is publicly regarded as a scholar and traditionalist. Secretly, Ishikawa was leading a nationalist movement to return to Japan to its pre-WW2 military strength. Ishikawa was behind the murder of Gary Emerson's parents. He believed that the death of an American Ambassador would galvanize support for his nationalist plans.
Ishikawa became Kuroda's benefactor when Kuroda returned to Japan.
Played by Teru Shimada in The Wolf Boy.