臺灣光榮特庫摩宣布《生死格鬥 6》（DEAD OR ALIVE 6，以下簡稱 DOA 6）新增來自《忍者外傳》（NINJA GAIDEN）系列的追加角色「紅葉」。另外還有「變身！NINJA 服裝」以及 v1.11 版本更新。
紅葉為隼之里的女忍者、龍之巫女，為了測試和龍隼修行的成果，再次回到格鬥大賽「DEAD OR ALIVE」的舞台。以師承隼流的古武術，和運用輕巧的身軀在空中使用千變萬化的攻撃玩弄對手。遊戲亦追加可於遊戲內解鎖的數件紅葉服裝，指令練習模式、連段挑戰模式和 DOA 任務等內容。
紅葉專用的初次登場服裝組合包含 Deluxe 服裝、歡樂婚禮服裝、七海海盜服裝、樂園泳裝和海風徐徐的夏日連身裙等 5 款服裝。
此外，「變身！NINJA 服裝」為 26 名角色追加服裝的付費 DLC，此服裝可發動對戰中使用挑釁和崩解爆擊使服裝變身為散發黃金光澤的「黃金 NINJA」功能。一起來享受《忍者外傳》系列 15 周年紀念的氣氛吧。
更新內容 v1.11 版除了角色追加，亦實裝可於各關卡設定 BGM 、於排行榜對戰模式顯示「NAT 類型」（PS4、Xbox One）、可在排行榜對戰模式的搜尋條件中指定連線品質（Steam）等各項功能追加和改善。
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