The female character in Tetsumen Tou, commonly known as "Marilyn," frequently clashes with Asimov, Freud, Shouko (less often than with the other two), and Robby (once). She employs her charm to obtain what she desires. Marilyn operates the Venus robot and has a crush on Koumei. Toward the conclusion of the series, along with Asimov Katoki, Orjin, Norman, and Hashnikov, Marilyn was utilized as an energy source by the Sigma computer and Sigma-Ken until they ceased to use her and disposed of her; however, Kumano and Freud were able to rescue them in time. In Episode 27, Marilyn confronted Ken with the Venus robot. Her name is a reference to Marilyn Monroe.