Background
Ex-Military: The galaxy is full of armies, from the numerous planetary defense forces to the awesome might of the Imperial Military
Motivation
Ambition
Power: The character craves power and authority over others. Their rule may not be despotic, but they wants to control their situation and those around them, often bettering themself in the process.
Crime: The character supports the idea of black markets, mercenaries, and other groups that fall outside of the law. The character need not be a criminal themself, but may give aid to other criminals, especially if they are family members, childhood friends, or if corruption is deeply embedded in the character's originating culture.
Comrades: The character shows loyalty to those they serve alongside. This could be either the current group of PCs, former military buddies, or business associates.
Blood Money: Simply put, violence is this character's business, and that business is never in short supply. The character knows no other way to make their way in the galaxy, and thus treats their bloody work as any other job.
Obligations
Criminal: The character has a criminal record, or was accused of a crime (perhaps one they didn't even commit), and is somehow embroiled in the legal system. Obligation may be settled by paying ongoing legal costs, making attempts to bury evidence, or efforts to prove their innocence.
Collateral Accountability: In the pursuit of a past contract, the character was careless. They accidentally destroyed the prized possession of some major underground figure or killed someone important to that person. Now the figure holds it over the character's head. Ambiguous threats and demands for repayment have become near-constants in this character's life, as the underground figure refuses to let them forget their responsibility. They have a financial blood price or other compensation they could pay, but it is astronomical. Until it is paid off, however, the guilt and fear are ever-present. If this Obligation is triggered, the character can suffer to some or all skill checks during the session (at the GM's discretion) due to this burden on their nerves.
Description