Kiriko Aoi is the extremly busty scientist and head of the Dannar Base, as well as the mother of Anna Aoi and the mother-in-law to both Goh Saruwatari and Shinobu Saruwatari. Together with her husband, Tatsuya, she was responsible for the development of the Dannar project.

Despite her serious and harsh attitude at times, Kiriko has shown that she can be fun to be around, as well as be a loving mother and friend.

Kiriko Aoi is a fairly tall and voluptuous woman. She typically wears a white dress type labcoat with buttons that can be easily popped free thanks to her massive breasts. She usually uses her enormous and engulfing cleavage as an extra pocket for things like her cellphone, zippo lighter and her menthol cigarettes.

Kiriko doesn't wear bras and her breasts bounces a lot when she walks, and jiggle incredibly even during the mildest movements. Her labcoat is also very tight, as when she spreads her arms, her boobs quickly pop all the buttons off. She can also be seen multiple times assertively pressing a character's face into her cleavage and squeezing them there while smiling. All the while, she never seems to display self-consciousness over her breasts being so visibly prominent, instead displaying indifference or pride.