Katana is a fictional character, a superheroine published by DC Comics. She first appeared in The Brave and the Bold #200 (July 1983), and was created to be a member of the first Outsiders team by writer Mike W. Barr and artist Jim Aparo.
Tatsu Yamashiro was an average Japanese girl, save for her proficiency in the martial arts, a trait encouraged by her parents. Two brothers - Maseo and Takeo Yamashiro - both proclaimed their love for her. While she liked both, she chose Maseo. Takeo, "did not take this well," and refused to attend the couple's wedding. Unmissed - indeed, Maseo (his only family) disowned his brother, who had joined the Yakuza, taking their mark of a large dragon tattoo across his chest - Tatsu and Maseo, mourning the deaths of Tatsu's parents, (cause unknown) started a family of their own. Tatsu gave birth to twins, Yuki and Reiko, while Takeo rose in rank of the Yakuza, indulging his "exotic tastes" for ancient weapons. He was presented with a pair of matching swords by General Karnz (later henchman to Baron Bedlam), one of which Takeo favored for its mystical properties.
Takeo spent days preparing himself, before taking both swords to the Yamashiro residence, demanding his brother duel for the "prize" of Tatsu.
Eventually Tatsu journeyed to Markovia, a small Baltic state, where she had tracked down Karnz, and she was successful in killing him, inadvertently implicating Black Lightning (coincidentally there with Batman) in her crime. Attempting to rectify the misunderstanding by freeing Black Lightning, she encountered a young girl who was named Halo. The two joined up to rescue Black Lightning, Batman (himself captured due to a blunder by Halo), and Bruce Wayne's employee Lucius Fox from their captor, Baron Bedlam.
Read more about Katana at Wikipedia
Official Site: D.C Comics
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