Best Buddies:
Galactic Empire / Imperial Remnant - Quite possible, though I would hate for them to pass us on the galactic conquest index. If we do ally with them, I'd expect high tension throughout the whole thing and an eventual breakage. However, as a newer faction any support we can muster is useful in the beginning.
Buddies:
Covenant of the Black Rose - Depends. They're on the OS hit list and backing them would automatically earn our name a spot on there as well. If we plan on going major, the One Sith would surely invade as soon as we begin our galactic dominance. But like I said, any help is good help.
Hutt Cartel - Darth Vader and Palpatine both aligned themselves with criminal organizations ranging from the Bounty Hunters' Guild to Prince Xixor's Black Suns. Could turn into quite the story.
Techno Union - They're pretty chill, and I know them ICly as well as OOCly. They've got a tendency for crushing Rebel Alliances as well so maybe a trade agreement can be made before a full-fledged alliance.
Neutral:
Mandalorian Clans - They seem like the kind of people who don't want in Imperial business and I'm sure we can respect that. They're currently at war with the Primeval and have hostile stances towards the One Sith and the former Sith Empire from over a year ago.
Primeval - A strong ally of the One Sith. Very chaotic, death-worshipers, and constant conquest. Allying with them would mean some protection and leeway from the One Sith but I wonder if Imperial ideals would clash harshly with theirs.
One Sith - Leave them alone for the moment.
Hostile / High Tension:
The Republic - They're good guys, we're not.
The Galactic Alliance - Canonical enemies.
The Silver Sanctum - See "The Republic."