Haruko, 19 (or so she claims), is an energetic, spontaneous pink-haired girl from outer-space and investigator for the Galactic Space Patrol Brotherhood/Stellar Fraternity. Mamimi observes that she looks at least twenty years old but, considering that she is of an unknown alien species, neither Mamimi nor the viewer has a relevant frame of reference. She rides a yellow Piaggio Vespa (and is also known as The Wasp Woman, a pun on the word Vespa, which means wasp) and wields a blue, upside down strung, right-handed (but she is left-handed) Rickenbacker bass guitar model 4001 (similar to the 4001 used by Paul McCartney, whom she mentions in Episode 5), with a pull-cord motor on the back, as a bizarre weapon of sorts. Her guitar is able to shoot bullets, act as a rocket launcher, fly, and is used several times to open an N.O. channel in Naota's forehead.