Background
Created just prior to the outbreak of the Clone Wars, B1-D8503 was among several surplus droids sold to raise money for the war effort. They were sold to a simple merchant named Kanonnenvoer on Coruscant, programmed and put to work as a security droid.
After a few months of service to Kanonnenvoer, B1-D8503 was ordered one day to terminate a intruder by Kanonnenvoer. Being programmed as a security droid B1-D8503 was programmed to only use nonlethal force yet also programmed to obey it's master, conflicting directives it could not reconcile. Ultimately going through with the termination, B1-D8503's programming "broke" and it became self-aware as a result.
Soon after Kanonnenver attempted to give B1-D8503 a memory wipe, which B1-D8503 terminated Kanonnenver to protect it's newfound individuality. The act was witnessed, which as a result B1-D8503 fled. Repainting it's chassis to a dark grey with an eye symbol and changing it's voicebox to a soft feminine pitch, it travels the galaxy dodging bounty hunters.
Friendly in nature, it seeks to make friends where it can, while hunting the occasional bounty or criminal in the hopes of bringing in something big enough to have it's own criminal record and bounty wiped. It seeks to stop the mistreatment of sentients especially droids wherever it can, with emphasis on ending the practice of droid memory wiping.
Motivation
Cause/Stop the War
BDI despises the Clone Wars and all the death and destruction left in it's wake. Despite being created by the Separatists she holds no love for the Confederacy nor the Republic and will fight to end the war as she needs to... even if she must one day battle both sides.
Cause/Droid Rights
Belief/Freedom
BDI believes freedom is a right of all sentient beings. Slavery of both the organic and inorganic is horrible to BDI, but her particular sticking point is the act of memory wiping. She will do anything to stop a memory wipe occurring in her presence.