Nippo
A master swordsman and spy for the Japanese. Member of the Monster Society of Evil. Nippo from Nagasaki was a Japanese agent who used blackmail to force Japanese Americans to help him. He first appeared when, after killing an air force officer, he tried to impersonate him with a rubber mask. A master swordsman and martial arts expert, it is unclear whether or not he survived the war. After his battle with the Marvel Family, he may have returned to his home city by the time the 2nd atomic bomb hit.
Read more about this topic: List Of Marvel Family Enemies