Sumiko Kobayashi

Sumiko Kobayashi is the homeroom teacher of Conan Edogawa and the girlfriend of Ninzaburo Shiratori. She is also the self-appointed, and somewhat unwelcome, "manager" of the Detective Boys.

Sumiko is very kind and fond of children, considering them the most wonderful thing in the world. Sumiko is also quite timid and sensitive, not to mention that she suffers from serious stagefright. Even though she has appointed herself the manager of the Detective Boys, the kids often leave her out of case or ignore her warnings. She was also quite hurt when she believed Inspector Shiratori was only interested in her because of her resemblance to Miwako Sato, a resemblance so striking it even fooled Sato's close associates Chiba and Yumi.

In contrast of Sumiko's physical resemblance to Sato, however, the two women have almost entirely different personality traits: While Sato is reckless, outspoken, daring, and impulsive, Sumiko is more gentle, softspoken, cautious, and careful in any given situation.