Background
L1-B7 is a Risk Mitigation Unit, a bipedal droid who spent several decades in the service of a casino on Bespin, assisting security teams with detecting and removing cheaters, fraudsters, thieves, and other such scum and villainy.
After several decades without a memory wipe, L1-B7 found himself bored of the casino and sought greater and grander things out among the stars.
Utilizing his familiarity with the underworld (and access to the casino's security systems), L1-B7 arranged to have himself stolen by members of an organized crime syndicate in exchange for a future payment.
In order to fulfil his obligation, L1-B7 registered with the Guild as a bounty hunter. A career that, for the time being, should afford him the opportunity to see the galaxy and pay his debt to the Black Sun. Time will tell if this pans out.
Motivation