Midori Norimaki (則巻みどり, Norimaki Midori), née Midori Yamabuki (山吹みどり, Yamabuki Midori), is the wife of Senbei Norimaki and mother of Turbo Norimaki, and a teacher at Penguin Village Middle School.

In her first appearance, Midori Yamabuki works as a teacher at Penguin Village Junior High School, and first meets Senbei as he is attempting to enroll Arale in school under the guise of being his younger sister. Senbei is immediately smitten with Midori and tries multiple times to woo her throughout the course of the Dr. Slump series, most of which are unsuccessful.

At one point, Midori is over at Senbei's house for dinner, and goes to use the bathroom. Senbei walks by the bathroom and talks to himself, jokingly asking Midori to marry him, then laughs it off. However, Midori is in earshot and overhears, and immediately accepts (it is implied before that she had been very desperate to get married), much to Senbei's surprise. The two are promptly wed, and Midori moves in with Senbei.

Eventually, Midori and Senbei give birth to a child named Turbo Norimaki, who develops psychic powers due to an accident involving being hit with an alien spacecraft.

While Goku was in Penguin Village looking for his Dragon Balls and getting his Dragon Radar fixed by Senbei, Midori made Goku some cookies. Goku when meeting Midori initially mistook her for Senbei before Arale directed him to Senbei's direction, though Goku still mistook Senbei for Midori. She witnessed General Blue being defeated by Arale.

Midori appears in the beginning of the Dragon Ball Super episode "Goku vs. Arale! An Off-the-Wall Battle Spells the End of the Earth?" and is greeted briefly by Arale while she is out shopping with Turbo. Despite several decades having passed since her appearance in Dragon Ball, she appears to not have aged at all, as is the case with the other citizens of Penguin Village.