Imma talk about 12th Gen.
Ogata and Maria are god damn on point with their facial expressions. Ogata surprised me, maybe it was her ice skating training, but her expressions are like a professional. Everytime she was on screen she looked amazing, and with the right sort of mood too - like she new exactly what she was doing. Maria was so good, too, but hers was like - this natural kind of ease in front of the camera. If these two became faces for MM I wouldn't complain.
Haga has this awesome like... cold stare that I just can't get over. I noticed it on her concert Towel, but I kinda fell in love with her as soon as she popped on the screen looking all:
Miki needs some expression work, she had no idea how to move her face but it isn't too bad.
Dancing wise, Miki and Maria are best. I saw Haga go awkward a few times and phheww... Ogata... you really are the new Haruna. I'll be rooting for you!