[pzxc]

Worf isn't half-human, he was just raised by humans. He was never about "choosing between two worlds" like Spock was, rather his background was more of the "stranger in a strange land" variety -- growing up in an alien environment, he had to become even MORE Klingon to retain his heritage, thus he always took everything seriously, especially Klingon matters like rituals and honor. Early on in the show they established that pretty well when Guinan pointed out that Klingons laugh, but Worf really doesn't (although he softens as time goes on, especially once he gets involved with Dax).

Troi, on the other hand, was explicitly half-human, although it seems that was only because the telepathy that comes with being full-Betazoid would destroy too many of the plotlines -- nobody remembers her mixed heritage all that much and we keep having to be reminded of it when it becomes relevant.

[jonnathanson]

Ok, wow, I stand corrected then. I apologize. For some reason I'd always assumed he was half-human; I don't know where that assumption came from. Maybe it's a bit of mental conflation, given how frequently other aliens-on-the-bridge in Trek series are half human.

Even still, I do think he was choosing between two worlds. Pretty much every time he encountered Klingons in TNG, they made comment about his wearing a Federation uniform and serving under humans. And there were several occasions where the derision went the other way: humans (or non-humans) would chide Picard for having a Klingon officer. Whether we choose to call this trope "stranger in a strange land," "choosing between two worlds," or something else altogether, the fact remains that Worf was an atypical Klingon in atypical circumstances, often forced to choose between whether he was to pursue his Klingon heritage and familial obligations to their fullest, or whether he was to be a Federation/Starfleet officer -- the requirements and laws of which often ran in direct contradiction to Klingon ethics. That was, indeed, a major source of drama for Worf throughout his character's appearance on TNG.

In DS9, yes, you could say he chose to be a Klingon. And by the end of the show, he made that choice unequivocally. Even still, it would have been nice to have had some remnant of the conflict remain. If only because that conflicted forces tradeoffs.