Aris is Rusty (because railgun), Beatrice is Snail, Yuzu is the real Raven, Himari (presumably) represents 621. Not sure on Miyu or Aru though.
I think Miyu/Yuzu are supposed to represent the "meta" builds in PVP (zimmerman/songbird spam, and high altitude hovering tetrapod missiles)
The real Raven has a scudder in the right hand rather than the zimmerman, and has dual missiles in the left shoulder rather than another songbird, and Nightfall has regular legs rather than reverse joints, so I don't think yuzu is supposed to represent the real Raven.
Also I just noticed Cherino's tank(?) on the right, dunno how that should be tagged though.