Rosuto (ロスト, lit. The Lost) is a member of the Seven Ninja Swordsman of the Mist and the wielder of one of the next generation of blades unique to the Seven Swordsman called Nichiyō Rōzuobu (日曜ローズオブ, lit. Rose of the Sun). A Jōnin-ranked Shinobi of Kirigakure and a missing-nin of Konohagakure who defected during the events of the Fourth Shinobi World War after being impressed by the leadership of the Fifth Mizukage Mei Terumī; whom he later swore allegiance to.