Class: Combat Droid
HK-47 harbors a deep distrust for all organic lifeforms, but reserves most of his frustration for his dealings with those of the pacifist variety. This identity-challenged droid starts out his service to you as a mere translator, but as soon as you begin talking to him, you'll realize that there's something a bit off about him: he seems to be filled with a desire to kill. Luckily, he's quite good at it.
Even though HK is proficient enough at battle when you meet him, characters with a high repair skill will have the opportunity to tune him up a total of four separate times, each of which will add new abilities and attribute bonuses. The first tune-up requires a repair skill or four, and adds two to HK's dexterity; the second upgrade requires eight repair, and adds two defense; the third requires 12 repair, and lets HK regenerate one hit point per round; and the final upgrade requires 16 repair and gives HK an extra +2 to dexterity, and doubles his regeneration rate, as well.
Attributes: Since HK-47 is a blaster rifle specialist, you'll want to increase his dexterity every fourth level.
Skills: Repair is the obvious winner here, but since HK gets two skill points every round, you'll need to find something else to pump. Demolitions is nice, since you will find equipment that adds large bonuses to it, making HK a nice minelayer.
Feats: Rapid shot should be mastered, and toughness should be brought to the second rank to reduce the damage that HK will take. Unfortunately, the handy cure and heal powers that your Jedi wield will not affect HK, so you'll have to churn through repair kits to heal him up, unless you like warping back and forth from the Ebon Hawk.