Makes me think of roleplaying. Most people have a 'type' when they roleplay that most of their characters tend to fall under to some extent, something they enjoy playing and play well — not a total pigeonhole, but a set of tendencies, we used to describe it as the "Played by [name]" flaw when we played World of Darkness. Mine tends to involve 'Does not suffer fools gladly', 'direct approach', and being amoral. Not evil, merely willing to do bad things for good ends, or at least for necessary ends.