Amanda Rogers. She grew up in a human environment and is also an omnipotent being (apart of the Q continuum) . She has the best of both worlds. Plus, she's cute
But, I'd also vote for Janeway's godson (Q's son). He made a dramatic change while forced to work as a human (aboard the U.S.S. Voyager of course). Now he's got an amazing personality, and is kind and considerate.