Kau, also known as Kau-ane, is one of the four distinct personalities inhabiting the robot Qu-0213 in the original net anime Bullet/Bullet. She is specifically identified as the twin sister of another personality, Nosa, and the two are often locked in arguments or fights with each other.

In terms of personality, Kau is described as having a yankee or delinquent nature. This trait contrasts sharply with Nosa, who acts as a caring older sister figure to the young protagonist Gear, and with the other personalities, which include a laid-back uncle and a kind-hearted grandmother. Within the team, Kau, alongside Nosa, is responsible for hacking tasks.

The character Qu-0213, and therefore Kau, is part of a small business run by the boy Gear and the gambler Shirokuma. This business specializes in retrieving stolen items in a post-apocalyptic wasteland where civilization has collapsed. The group finds themselves drawn into a larger conflict after accepting a job from a mysterious girl named Noa, putting them in the crosshairs of an armed group. The Japanese voice actress for Kau is Kana Hanazawa. Further details regarding her specific development arc, deeper motivations, or other key relationships within the story are not available in the current search results.