There are 5 classes of droids in the Star Wars galaxy. 1st class droids are basically built for knowledge, science and medicine. 2nd class droids are built for technical and mechanical tasks, 3rd class droids are service and protocol droids, 4th class droids are built for combat and security, and 5th class droids are built for manual labor. So the pre-made character is a combat droids, although he has specialized in medicine (so he's like a combat medic). In fact, in the Edge of the Empire beta, 4th class droids are the only kind of droid you can pick. I'm just guessing, but I suspect there will be other kinds of droids in the other editions of this RPG.
The way the game is built, once the Core Rulebook comes out, you can use this type of droid for all kinds of different purposes. You can be a Bounty Hunter, Explorer, Hired Gun, Technician, or Smuggler, each one with three different Specializations.
The pre-made character is a Colonist basically, with a Talent Tree that combines all of the three specializations for that career (Doctor/Politico/Scholar).