A heartwarming story told through the ages: Something unique enters a young man's (or woman's) life, and they form a bond that changes them forever, usually starting them down the path to adulthood.
What that something is, however, varies widely. From the classic "A Boy and His Dog", all the way to well, keep reading, you'll see.
Be warned, however, that whatever X is can easily fall victim to
Not quite a Wild Card, the Hidden Agenda Hero is almost certainly on the side of good. He regularly helps The Hero, expecting nothing in return, demonstrates definite good-guy behavior while avoiding actions which would denote a bad guy...and yet he never explicitly states what his motivation is for doing so, and there's evidence that he's up to something the Heroes don't know about.
Unlike the Aloof Ally
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