Companion modfifier you buy with DNA cannisters from Raghou Plauge event. Its the most expensive and I think best looking one.
Aolani just completed smuggler chapter 2, its a lot shorter than chapter 1. And she now has all smuggler companions, including ship's droid + Treek. She does not have HK-51.
Next Casami does bounty hunter chapter 2. After that if I want to keep alternating between republic and empire I wont be going in order I made characters as my next thee characters after Casami are also empire, my last 3 are republic.
Casual: Beyond: Star Descendant
Darkside: Star Wars: The Old Republic