It’s commonly said the Data is the “Spock” of TNG, but I disagree. As I believe they pointed out in Unification Pt. 2, Spock tries to be as little human as possible and Data tries to be as human as possible. That makes them opposites.
Spock is a half-human in Star Fleet which is majority human. He is constantly pushing against his human side and surroundings to be as purely Vulcan as possible.
Worf was raised by humans and is the only Klingon in Starfleet. He is, like Spock, constantly pushing against the humans around him, trying to be a pure Klingon.