Interestingly, only Astarion and Minthara have lot of fans in Internet.
Gail, Will, Laezel, even Shadow Heart (although she is cute and mysterious) seems to be chosen by many in game, but they do not have enough charisma and charm to have many discussions about them. They are good companions, interesting personalities, the developers did a good job but just ... just not that.
Creative people like bright, charismatic and self-loving maniacs who have a difficult fate and who know how to inspire
