The Ambassador is quite pompous and prideful, using her knowledge of the laws of Tidehold and her body to get her way with others. While she is a believer in fairness, she is not averse to taking advantage of others to get what she wants. As long as others meet justice for their actions, Justina will hold no remorse for what she has done to reach her goals.
Believing that she is an embodiment of justice in her nation, it's not uncommon to see Justina carrying a conceited demeanor.