I just think Tasha Yar was a good character with a great background, I mean all of our protagonists have solid backgrounds, but Tasha's was unique in that she came from a failed Federation colony. Regardless of what the characters went through, they grew up in a civilization. Tasha had no such luxury and grew up in city streets and back alleys, fighting rape gangs and despots. Scratching out a living. She enters Starfleet and becomes Chief Security Officer on the U.S.S. Enterprise, the flagship of the fleet! Now there
's Star Trek's philosophy in action!