Xehn, you forgot Nagi. She also uses the 3rd body. But she's a fairly rare LE so I dont expect many to get her.
As a followup to Xehn's post...
Expect any NEW Shinki (Not a variant) to use a 3rd body to.
So that means (when they eventually come out)
Baby Raz, Sharatan, Meilinda, Koharu, Altrene, and Altine, plus whatever other new Shinki is waiting in the wings.