That is rotoscoped from a human person, with the head pasted on. I think it looks pretty horrid as a result. The human body, squashed vertically (because they wanted longer legs) and then with a tiny anime head. Also watch for appearing/disappearing details while it animates like on the knee or the inside of the thigh. Dancing seloutry, generally, a mess. But yes, it animates smoothly.
Mike: I use Poser for basic anatomic fact-checking.