Green = 7* and G10 or more.
Yellow = 4* and G8 or more.
Red = anything that doesn't meet the above

Team 1:
Emperor Palpatine
Darth Vader
Tarkin
TIE Fighter Pilot
Royal Guard

Optional:
Stormtrooper
Snowtrooper
Magmatrooper
Starck

Team 2:
Veers
Thrawn
Shoretrooper
Death Trooper
Krennic

Optional:
Stormtrooper
Snowtrooper
Magmatrooper
Starck

Bounty Hunters (phase 5 SM requires 6*, rest require 4* minimum):
Boba Fett
IG88
Zam
Greedo
Dengar

Optional:
Bossk
Cad Bane

IPD mission:
Veers
Starck
Snowtrooper
Shoretrooper
Death Trooper

Optional:
Stormtrooper
Magmatrooper

Nightsisters:
Asajj
Old Daka
Acolyte
Talzin
Zombie

Optional:
Talia
Initiate
Spirit

First Order:
Kylo Ren (Unmasked)
FO Officer
FO Stormtrooper
FO Executioner
Kylo Ren

Optional:
FO TIE Pilot
FO SF TIE Pilot
Captain Phasma

Sith:
Darth Maul
Darth Nihilus
Savage Opress
Darth Sion
Sith Assassin

Optional:
Sith Trooper
Darth Sidious
Count Dooku

Phase 6 Special Mission: *there is a bug on this one that you need 7 available Empire at 7* to attempt this mission, do it first
Veers
Starck
Imperial Probe Droid
Shoretrooper
Death Trooper

Optional:
Stormtrooper
Snowtrooper
Magmatrooper
Thrawn
Krennic