Diaochan gets the benefit of stardom from the popularity of Three Kingdoms. Wang Zhaojun and Yang Guifei gets the benefit of being more interesting than their male counterparts, hence they may get more media dedicated to them (though Wang Zhaojun still doesn't have that much media attention overall). Xishi kind of gets overshadowed by the power struggle between Goujian and Fuchai, so most of her series feature the men and she gets forgotten. Maybe Xishi needs a better PR rep to get herself a lead role in a series .