Out of all my older stuff to have AI, Yuyuko is probably the worst by far, if only because she can use a command throw to hit opponents in hitstun AND that she has an infinite that the AI can take advantage of. Thats only the tip of the iceberg.
On the subject of Yuyuko, regarding her theme from Ten Desires, is it Ghost "Lead" as in leader or "Lead" as in the chemical element that blocks x-rays and poisons you?