Miya Shimada, a defector from the US to Japan during WWII, and former member of the Young All-Stars, Tsunami can generate and control tidal waves. Her daughter, Debbie AKA Deep Blue, is the half sister of Aquaman.
Tsunami has superhuman strength; able to swim at superhuman speed, ability to create and control tidal waves.
Within the context of the stories, Tsunami is a Nisei who grew up in Santa Barbara, California, prior to World War II. Due to the racial prejudice against Japanese-Americans, she suffered in the period leading up to the entry of America into the war and joins the cause of the Imperial Japanese government. Over time, she becomes disillusioned by the dishonorable conduct of those she is working with and eventually changes sides. In stories set in contemporary settings, she has a daughter, Debbie, who she raised with her husband, Neptune Perkins.
Created by Roy Thomas and Rick Hoberg, first appeared in All-Star Squadron #33 (May 1984).