I don't agree that she's that unique though.....she's essentially another Vulcan but one that has the occasional emotional crisis...
It's that aspect of the character that I actually don't particularly care for. I can see starting her off
as someone who had been robbed of her humanity by the Borg, but by the end of the fifth season, she probably should have been the most
emotional character on the show as she reconnected with feelings she hadn't experienced since her assimilation. I think the series really dragged out her return to being Human for the sake of keeping a sexy (but oblivious to her sexiness) woman parading around in a tight catsuit--something they would repeat in the very next Trek series with T'Pol.