He was a stormtrooper squad leader stationed on Tattooine, but then the Emperor died and there was some serious anti-Empire mentality on the planet.

Remember episode 5 of The Mandalorian when they go to Mos Eisley and there are all the stormtrooper helmets on spikes? To avoid that fate my character dumped his helmet and armour, and urged his surviving troops to do the same. But they were too brainwashed and refused. While he was trying to convince them the local hutt syndicate raiding their building. All his troops end up getting killed in a quite large shootout.

However he manages to escape after inflicting serious damage to the syndicate goons. Since then he's suffered from survivor's guilt and has been trying guerrilla tactics to take out as much of the hutt's assets as possible as an unhealthy revenge. This has earned him a bounty.

He thinks that killing the Hutt is his only way to "atone" for "failing" his troops. He also suffers from agoraphobia when he is not wearing a helmet of some sort, due to spending most of his adolescence and adulthood with a stormtrooper helmet on.

Cause - Support the Empire:
An ex-Stormtrooper. He didn't quit but the rising anti-Empire sentiment in Mos Eisley caused him to have to give up the job.

Oath - Wants to kill Teemo the Hutt due to his troop being killed by the gangster Hutt.
Bounty - Has a bounty on his head from Teemo the Hutt, due to the amount of damage he inflicted upon Teemo's men.

Almost always wear helmet. Greying hair at the sideburns and above the ears.
White full helmet with large black visor, provides good vision. Has various sensors inside depending on mechanics of the game.
Black leather jacket, with right shoulder pad coloured orange. Left shoulder pad is crossed with 4 durasteel plates that extend almost down the whole upper-arm.
Metal plates over elbows. Not fixed, the plate moves with forearms. Provides good platform for shooting while prone. Can be melee weapon?
White shirt underneath, 2 parallel black stripes from right shoulder to left hip.
Black nylon work trousers with lots of pockets. One obvious gun belt with blaster on right hip.
Scuffed steel knee pads.
Almost knee high black boots scuffed steel toecaps.