[Ash Talon]

He's got ball hips, double knees, and ankles which are standard Hasbro points. I don't see them skimping on upper body POA too much.

The square is probably for a light-up head feature. It probably means not waist or torso articulation. However, there's no way to tell on articulation. He definitely has at least hinged elbows, although they're likely typical Hasbro ball joints. And I'm guessing wrists as well. Look at how his left hand is angled in comparison to the upper arm. Seems like a slight rotation to the hand.