Personal Info:
Real Name: Miya Shimada
Also Known As: No known Alias
Place Of Birth: Santa Barbara
First Appearance: All-Star Squadron Vol.1 #33 (1984) Bronze Age Villain
Known Associates: Kung, Sumo the Samurai
Group Affiliation: Samurai Squad, All-Star Squadron, Young All-Stars
Base Of Operations: New York City
Grudges: All-Star Squadron
Creators: Roy Thomas and Rick Hoberg
Enhanced Abilities: Tsunami has super human strength, durability and endurance.
Swimming: Tsunami can swim at incredibly fast speeds.
Hydrokinesis: Tsunamiís powers are mental in nature and allow her to cause tidal waves to form in the ocean with the ability to mentally control them. It has also been seen that Tsunami can control the flowing path of even smaller masses of water.
Miya Shimada was born a nisei, a Japanese-American born in the United States of native Japanese parents. She was thus a full American citizen and grew up in Santa Barbara, California.
The racial prejudice against Japanese-Americans that Miya encountered during the start of World War II caused her to turn against America. She went to Japan to study for a few years and there she joined the cause of the Imperial Japanese government. It was the famed Japanese naval commander Admiral Yamamoto who named Miya Shimada "Tsunami" (the Japanese word for "tidal wave") after her mental power to create and control such waves.
In early 1942, after the United States had entered the war against Japan, Tsunami was secretly brought to California by a Japanese submarine and she sought to convince Japanese-Americans to join Imperial Japan's cause.
Tsunami at DC Database
Tsunami at Comic Vine