Sia had a relatively happy childhood. Born to a pair of musicians, they knew their parents would support them no matter what. Glee Anselm however was far too boring for Sia. There was no action, no excitement. Sia began exploring other worlds at the age of 15, and found it much more exciting. However, it wasn't always particularly profitable. Unexplored worlds are sometimes rich in natural resources, but rarely rich in investors or treasures.
Sia discovered that their skills for sneaking past security bots, they had (insert crimelord name here) find them a crew. They ran a couple jobs with this crew, culminating in a failed heist on Alderaan. After this, (insert crimelord name here) decided that Sia would have to work off not only the funds that had been given to them, but also the value of the four crewmates they had let die. The crimelord decided to hide Trerra's survival from Sia, mostly for (insert crimelord's pronoun here) entertainment.

Overthrow the Empire. Sia has never really cared for the Empire. She grew up hearing about the glory days of the republic, especially from her father. Her uncle on her father's side was a Jedi, and her father never believed that he was a traitor.

5 Obligation: Betrayal. A few years ago Sia was part of a crew running a small heist on Alderaan. They were offered a few credits by a Black Sun agent to look the other way for a minute. They thought that the Black Sun was only planning on snagging the piece of art that their crew was hired to steal. Turns out, there was a contract out on the head of the crew, Stavum Krux. Moments later, there was an explosion. Sia assumed the worst, and fled, not knowing that Trandoshan crewmate Bisst Trerra survived the blast with only light injuries. Trerra didn't take kindly to the attack, and since Sia was no where to be found assumed she was in on it. Sia eventually found out Trerra was alive and has been avoiding him since.

10: Debt. The crime lord we work for helped Sia get started in the crime biz by finding a team for him. Sia didn't know what he was getting into when he took on that debt, and has found himself unable to pay it off so far.