Kasumi is a kunoichi of the Mugen Tenshin Ninja Clan and a heroine in the Dead Of Alive series, who debuted in the first Dead or Alive. Kasumi became a "Runaway Shinobi" after she ran away from home in order to avenge her older brother, Hayate. She is also the older half-sister and cousin of Ayane.

One of the first three females that appeared in the series (alongside Lei Fang and Tina Armstrong), Kasumi has become the main protagonist of the Dead or Alive series.
