OMG! *dies* I love Six! I have been working on her concept for a couple of years now. I could never get her just right, only halfway. I'm very happy with this form. She's not a new species or technically a mix of any. She is a genetic mutation created by the government in an attempt to create a creature to replace the need for human soldiers. Since she is only the sixth in experiment she is far from perfect. She does have the ability to walk on her hind legs, though not for very long (few miles or couple hours) she also has opposable thumbs and tail. In an attempt to make her a better 'soldier' she is fairly immune to pain, and mostly enjoys it, sadly also making her unable to understand self control. She tends to be a bit rough. This is a scene where she's in the lab and the scientists gave her a ball to see what she would do with it.
She was ultimately scrapped and doomed to die, it's unclear how she managed to escape the confides of the base, but she is now thought to wander the earth.