Bounty Hunter - Mako
Imperial Agent - Raina
Sith Warrior - Jaesa
Sith Inquisitor - Ashara
Smuggler - Akaavi / Risha
Jedi Knight - Kira
Jedi Consular - Nadia
Trooper - Elara?
Because of trooper, this feels unlikely (or maybe thats even better?) but this backstabber can be a female from our previous (vanilla) companions. IF every class would get different (personal) traitor... that would solve few problems like light/dark jaesa, and would scratch a lot of "I want this" companions out of the list.