Z2-1B
this 2-1B series medical droid was one of the few examples of its kind to go rogue, adopting an independent agenda that it set out to accomplish on its own. Known as "The Doctor" by its creations, Z2-1B was once a regular medical droid, until sometime during the New Order, when a lethal plague wiped out the entire population of the planet on which it was working. Z2-1B continued to investigate a possible cure for the plague for many months after the deaths of its human companions, before realizing that it needed help to complete its mission. Lacking organic resources, Z2-1b began to create droids to serve as its assistants. Over time, Z2-1B came to realize that organic life was fragile at best, and that its droids would serve another set of organic masters until they died as well, leaving the droids behind once again. With this realization, Z2-1B suddenly found that it believed humans to be inferior to droids. With this realization came the drive for independence, and Z2-1B set out to develop what it considered the "perfect" droid, using his existing creations as a baseline for his work.