Haruhara Haruko is a manifestation of Eris. The reasons should be obvious, but in case they are not, I will proceed.
She arrives on a yellow, ie golden, scooter, wielding a left-handed bass guitar. This shows that she is left-handed, a sure mark of the illuminated. She comes and goes as she pleases, leaving chaos in her wake.
She is a study in extremes, extremely sweet foods, extremely spicy food. She is sexually open and playful, using her sensuality to disturb the uptight Naota. She drags the boy out of his shell, opening his pineal gland to another dimension.
Her goals are to free the great pirate from his prison in the Greyface lab, supposedly to steal his powers. What is really going on is that Atomsk is the equivalent of Haruko's Shakti, her divine power. The genders have been reversed, keeping with the theme of turning the world upside-down.
To tap into her divine energies, one must open one's pineal gland to N.O. energy by striking oneself in the forehead, preferably with a musical instrument, and meditate on the sigil of Atomsk.