Annapuma

Anna & Uni are a pair of tall, beautiful android catgirls who were created as "love dolls" to be marketed for profit, but they developed beyond this superficial programming and became criminals, joining forces with Buaku. After Buaku disappears, they wander about aimlessly doing odd jobs for anyone who can pay them. Except for the occasional spat, they are inseparable and sisterly in the most extreme ways. They despise the series' heroine Leona Ozaki, and the feeling is mutual. In the first anime series, they have blonde hair, but in the second anime—New Dominion Tank Police—they have red hair. In the Sequel 'No More Noise' the Puma Twins join the Tank Police. Understandably Leona objects, but the chief points out that, as androids, they're not responsible for their actions and therefore can't be held criminally liable (another recurring theme in Shirow's work: what constitutes a person? The puma twins have shown they are quite capable of making their own decisions, but are exempt from taking responsibility for their actions on a technicality). Interestingly, for all that they were created as sex dolls, they are vastly superior to humans in terms of strength, agility, speed and ability to take damage. They also have what seems to be the equivalent of military-grade targeting computers. The oddest trait of their construction is that much of their large size is optional. They have the ability to shrink to child-size by expelling large amounts of water (and returning to normal size by ingesting water). This is revealed when it's discovered their normal size is too big to effectively pilot the tanks. Many of these traits don't come into play much (or at all) in the OVA, but are all present in the manga. They also have a cameo in the Manga version of Ghost in the Shell, where they are selling black market robotic mods and subsequently get robbed by a Fuchikoma.