Reiko Tamura

Reiko Tamura A Parasite who, coincidentally, infected Ryōko Tamiya, one of Shinichi's high school teachers.

History
After the Parasite took over Ryōko Tamiya's body, the Parasite took the name "Reiko Tamura". Reiko has scientific inclinations, and is driven to discover the biology, origin, and purpose of Parasites. Reiko discovers—by becoming impregnated by another Parasite named Mr. A—that a pregnant Parasite will bear a normal, human child, and that Parasites have no apparent means of reproduction. Reiko is more logical and reasonable than many other Parasites, and allows Shinichi to live unmolested largely because she finds him an interesting anomaly worthy of study.

She eventually gives birth to Mr. A's baby; after betraying her fellow Parasites and killing quite a few of them, the police brutally kill her. The baby survives because of her decision not to fight back against the police.