Narsha's sensual, but I don't think she's cruel. This one's probably one of the toughest votes for me since I love both characters to death.
Well, she does seem to get ar kicks out of Hrmoni's genetic experiments. Case in point: the GTB bad ending where Makoto is.. ahem.. "masculinized" and forced to do Akira as Narsha and Hrmoni watch.
On the other hand, she seems to genuinely care about Tarma in the good ending. So maybe its a wash.
I knew when this matchup fell into place by the algorithm that it would undoubtedly be your favorite round 1 matchup, Hyperguy. It's probably mine, too, since there's no other bad girl vs bad girl matchups in round 1. No such luck for Narsha in round 2 though: she gets Milfy, who couldn't possibly be any farther from bad girl.