0-D9

"0-D9 is a unique one. He's precise enough sew back on a limb without leaving a scar, or to hit an enemy commander between the eyes from half a mile away. But I chose him for Squad A not because of his caliber as a hunter, but because we share philosophy. He also sees a flaw in the Galactic society, and seeks to change it."

- Mr. Serpentine, on 0-D9's skills as a hunter and why he was chosen.

0-D9 was a medical droid who took advantage of a glitch in his programming and became a Bounty Hunter.

Creation and Escape
0-D9 was a medical droid in the 2-1B series who was a prototype for creation of a new series of medical droids who had a special additional programming which allowed them to deal in Mental health with as much expertise, if not more, as physical health. However, what was believed to cause him to rewrite his programming and escape was the additional depth inserted into his programming. This programming, which was the final act of a scorned worker who was being forced into earlier retirement, gave the droid greater perspective in life and allowed him to see a "disease" in the Galaxy, which he needed to "Cure". By this logic, he reasoned that he must first "cure" himself, before he was fit to "cure" anything else, and to do this he must first leave his life of meaningless obedience and indulge in some selfishness. Becoming a bounty hunter was both a way to do this, and a way to provide sustenance after he abandoned his home. Records are not exact, but is believed that he secretly injected lethal toxins into the scientists and security guards around him, then set off a chemical explosion within the lab he was working in.

Life as a Bounty Hunter
0-D9 put his skills as a surgical droid into use as a hunter, allowing him to have pinpoint accuracy with a blaster and mechanical precision in analysis of opponents. At some point through his career, he was one of the bounty hunter's invited to Keyorin by Mr. Serpentine. He was placed on Squad A.