Tomiko Amado is Takeru Ooyama's homeroom teacher and the older sister of Yuuka Amado. She was a founding member of Maken-Ki. She is a personal kunoichi serving under Minori Rokujou, who sometimes acts as Tomiko's classroom assistant.
She generally has a pleasant personality like her younger sister Yuuka, although Minori thinks she has a sadistic side. This is somewhat displayed in her training, and matches Yuuka's manipulative personality.