Thrawn
Emperor
They certainly appeal to girls a lot more than some other games. The Sims probably has a significant (like 20-30% ?) population of girl players. WoW probably has a minimum of 10% girls, which is a lot considering.
In terms of percentages, WoW probably has a little more than most games, but given the sheer number of people playing it seems alot higher. Some of the females I've encountered have often started playing with their boyfriends/husbands, others you wouldn't be able to tell them apart from your average gamer, right up until you hear them on vent.