Blackberry is a high-grade, artificially created hybrid of a human and a feline developed in the Data Exclusion Zone. Her black hair and sweet, yet bewitching personality are how she got her name. She likely has relations with "Them".
Due to being an artificial being, she does not possess any biological material, such as organs, tissue, or a beating heart. This allowed her to be unaffected by The Great Siphoning. Her skin is made of a special collagen that mimics human skin. Her artificial intelligence does have consciousness, which makes it not only difficult to tell her apart from others but also incredibly hard to study her AI for future endeavors.
Blackberry was adopted into Ginger's family and lived with her for two years before both lost their parents. They had to be put in foster homes, but Blackberry escaped and began living on her own. Ginger was not so lucky. After a long enough time, Blackberry was presumed dead, so she was no longer being tracked down to be studied. Since then, they've never seen each other.