Background
Zazim was an influential member of the Black Sun crime Syndicate during the reign of Alexi Garyn. When Garyn and his Vigos were killed by Darth Maul in 33 BBY, Zazim rose to the position of Vigo, where he remained throughout the Clone Wars and early days of the Galactic Empire. In 7 BBY, Darth Vader order the sterilization of a biological weapons facility on Falleen, a sterilization that included every single living thing both in the facility and in the surrounding city. Zazim's family, like the Black Sun Underlord's family, was caught in this sterilization, giving him a personal reason to despise the Empire. Zazim was on Coruscant when Xizor made his failed attempt to kill Luke Skywalker, and therefore discredit Vader before the Emperor. And in the ensuing chaos and civil war, Zazim attempted to take control of Black Sun, but was thwarted by Xizor's niece, Savan. His life being threatened, Zazim smuggled himself into the Coruscant underworld and tried to disappear, paying most of his fortune to the Black Nebula, another Black Sun offshoot. Zazim still owes a debt to Dequc, the leader of Black Nebula. After the destruction of the Death Star II, and the deaths of Darth Vader and the Emperor, and the subsequent capture of Savan by the newly formed New Republic following the Battle of Endor, Zazim reemerged from the Underworld. Wanting to reform Black Sun under his own control, and being unable to do so while Coruscant was under the control of the Imperial Remnant, Zazim reached out to the New Republic to offer his services and knowledge of Coruscant and the Imperials, in the hopes that they will allow him to reestablish Black Sun.
Motivation
Criminal: The character has a criminal record, or was accused of a crime (perhaps one he 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 his innocence.
Debt: The character owes someone a great deal, whether that debt consists of money or something else. Perhaps the PC has a huge gambling debt to a Hutt, is indebted to the Czerka Corporation for his starship, owes a wealthy family for patronage, or has some other serious financial obligation. To make matters worse, depending on who owns the debt, even fully paying it off might not get the character completely off the hookâif the character can get that money, he can surely get more.