Linn Suzuki

She is the protagonist of the show "Adventures of Kotetsu". Her nickname, Kotetsu, is assigned to her by Miho Kuon because she is the little sister of Miho's former coworker Tetsujin.  She has long red hair, which she usually wears braided. She carries a reverse blade katana called Gassan, which has allegedly been forged by a demon. She had escaped from her mistress in Kyoto and went to Tokyo, where she currently stays at Miho.