Nicknamed the Twins, Anna and Uni are in fact former test subjects, related only by the DNA samples they share from the same Puma. Many suppose this is the root of their uncanny connection and ability to be so in sync. Not to say that either of them posses psychic powers as such, but they do seem to work as one in combat, and have often sensed and located any peril that the other may have gotten themselves caught up in.
Some believe that the Twins were a "gift" to Selina from a mysterious associate, while others believe that Selina herself was somehow involved in their creation while others know better than to snoop around, asking probing questions.
Uni's belief that almost everyone will be her friend, given time, is heartwarming, that is until you see her dealing with captives, assailants or other test subjects. Then it just becomes a bit weird.
Though both extremely acrobatic, Uni is the one who would bounce and cartwheel into every room at she not been ordered to. She partly likes to show off, but the delight in those gleaming feline eyes tells that she enjoys the simple act of throwing herself about the room.
Uni very often finds herself prowling and springing along structures in near silence while hunting targets for Anna's scope, y'know, just killing time 'til the next round of tunafish and vodka.