Trip?Have we had a Star Trek series yet where someone does not die and then come back to life?
Hm, good question actually.
It really depends on what your definition of coming back to life are.
Spock definitely did.
Tasha? Not really. An alternate version of her, yes. But that alternate version never died, so did she?
Jadzia. Most definitely dead. Just her memories live on in the Dax symbiont. Unless you count Dax as the, then Dax didn't die, right?
Damar? He died, but you may not count him as a main character.
Lorca? Ok, he was a bad guy, but also a main character and he hasn't returned (yet).