I can definitely see where thief is coming from, but I'm leaning a bit towards Monk myself. They're more of the supportive sort, since while they can lead, they're more likely to motivate and try to cheer up others than be charging in the front. Quite a few of them are impulsive and energetic, and even females like Ursula tend to be more on the tomboy scale of things personality-wise. Many of the sentiments expressed in the characters you relate to question seem to fit the more classic monks, as forgiveness and mercy are concepts associated with the monks who actually do martial arts. Also, if you were a monk instead of a thief, you wouldn't have to arrest yourself if you do become a police officer! *shot*