Tomiko Amado is Takeru Oyama's homeroom teacher, and the older sister of Yuuka Amado. She was a founding member of Maken-Ki. She is also the shinobi of Minori Rokujou, who sometimes acts as her 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.