HK-47 for sure! He could mock people and I'd mess with him by inserting the Protocol Pacifist Package
HK-47: "Answer: Simply that the distinction between 'killer' and 'killee' be a clear one. I cannot kill of my own volition, naturally."
Revan: "I don't think 'killee' is a word."
HK-47: "Expletive: Damn it, master, I am an assassination droid... not a dictionary!"
"Angry Statement: If I see one more meatbag attempt to attack a Jedi with a blaster pistol, I'll kill him myself!"