My neutral agent doesn't care about the code. He wants what's best for the people of the Empire. Usually that means taking out any over-inflated Sith egos, but sometimes he just does that for fun. Jedi he could care less about, he basically ignores the existence of the Republic unless they're in his way, then he just shoots them.
My DS sorc is having way too much fun popping eyeballs with the Force to care about either code. She's the elder daughter of the agent and Raina Temple and ended up a slave when things went south for them after the story line. As far as she is concerned the galaxy is her enemy and deserves suffering and death.
My neutral mara is the younger daughter and views people as means to an end. The Sith code is her way of life. As soon as something is no longer useful it is discarded. Not before, and not after. She is hoping to elevate herself merely for self-preservation, and as such will brown-nose any authority until she can defeat it.