I just think that the demon that took over Harmony, and that was molded somewhat by her memories (just like all vampires are by their human hosts), just found the most petty, vapid, shallow creature imaginable and had absolutely nothing to work with- pretty much no personality or secret hates or anything.
The demon was wading in shallow waters and, as a result, Harmony changed little.
I agree.I never felt like Harmony changed at all. She was still the same vapid, dumb blonde as a vampire that she was as a human.
We can see it even this with other vamps on the show.
When she was human Drusilla was a kind, pious and virtuous woman who tormented by her visions, and even when she's a vampire she still has this innocent, childlike quality which makes her a tragic figure, even in death she's still a victim.
And Darla, even though the only thing we know about her from when she human is that she was a prostitute, seems to be informed by that. She tends to be seductive and cunning rather brutal.
She likes to play games, chiefly with men, (witness the first ever scene in Buffy where she pretends to be all innocent before she kills her 'date'...) her treatment of Holtz and ensoulled Angel were other examples.
So Harmony really was this nothing person, at least Cordelia had hidden depths.
However, She did try to change, just never succeeded in changing (example:In "Real Me" where she had minions and Buffy laughed because knowing what Harmony was in high school, she would have never associated Harmony with the word 'minions' as human Harmony was always more of a follower than a leader (Same trait applies to vampire Harmony as well)).
white avenger said:I think that if we knew more about human Harmony, we would be able to see more differences between her and her vampire counterpart. The truth is, just about all we ever saw of human Harmony was her interaction with Cordelia and the rest of that group of girls. We saw much more of her after she was turned than we ever did as a high school student.