Maybe it's hindsight seeing Worf in her position for all those years, but between the two of them, one of them would go eventually. They essentially played the same character; rough, kick ass, etc... Except one came with a Klingon backstory and one came with a tragic rape-planet backstory.

I don't think (other than fucking data), there's a single plot that they could give to Yar that they couldn't also believably give to Worf from an emotional story perspective. They're essentially the same character.

It certainly would have been interesting to see what they did with her over time. I have my doubts that she ever would have become a very deep character, but I'm sure she would have had some decent episodes.

At the very least, they could have done more to explore her background in a more fulfilling way than they did with the episode featuring her sister.

Denise Crosby has great talent as a villain. Just look at how she jumped off the screen as Sela. After seeing where the writers went with Ro Laren, I feel confident that Yar would have filled that role. She would have been a friendly foil, either as a member of the Maquis to set up Deep Space Nine, or as an onboard intelligence officer like Malcolm Reed in Enterprise.

In the early seasons — while Roddenberry’s edict that the crew not have conflict was in effect — I think she would have befriended Data and Geordi, and would have been in many scenes with them.

She probably would've been written well. They were pretty good at writing space characters on Star Trek