Katana is one of the Blind Bag characters in LEGO Dimensions 2: The Rise of Enoch, from the DC Comics franchise.
Tatsu Yamashiro was a Japanese woman with a talent for martial arts. Two brothers, Maseo and Takeo Yamashiro, fell in love with her and sought to woo her. Tatsu chose Maseo in the end, though she liked both. Takeo became angry at her rejection, which caused him to disown his brother, and join the Yakuza.
Takeo returned to face his brother for Tatsu's love. In the following fight, a fire started which resulted in the deaths of Maseo and his children, only Tatsu escaped with her life. Tatsu then trained to become a Samurai and used the name Katana, after a sword which she had for a time, carried the soul of her husband. Katana relocated herself to America, where she was one of the original members of the Outsiders, a team of Super Heroes commanded by Batman. She later joined the Birds of Prey, a team of female superheroes.