What does that mean, "definitive"? Typical? The best? Representing the majority?
Vulcan-Spock
Klingon- my favourite was Worf but he was not typical Klingon so I'd go for Martok
Cardassian-Dukat
Ferengi-Quark
Bajoran-Kira
And do you really think that Dukat was a typical Cardassian? Or that Kira was a typical Bajoran?
For starters, if typical is something like, an
average member of a race, I'm pretty sure that disqualifies every person in a high ranking military or political position. And even the guls and legates we saw in DS9 and TNG were all different, and none of them was like Dukat.
I am also quite sure that the average Bajoran was not a member of the Resistance, so that disqualifies Kira from being typical, too.
What does that even mean, typical? There are no typical examples of one race or the other. Although Star Trek has occasionally had the unfortunate tendency to make entire races into "A Planet of Hats" with a uniform culture, we've, fortunately, also seen a decent variery in characterization, particularly with Cardassians and Bajorans, who escaped the danger of being stereotypesI don't see how you could pick one person and call them "typical".
Also, shouldn't your point about Worf also apply to Spock? Worf has been brought up by humans, so he idealizes Klingon culture and tries to act like it. Spock was half-human and felt the need to compensate for it by trying too hard to be what he sees as a 'true Vulcan', i.e. 'he doth protest too much'. If Worf is not a typical Klingon, Spock is not a typical Vulcan, either.