You couldn't get a more stark contrast than ROCH's Gwok sisters - Gwok Fu and Gwok Seung. Gwok Fu is one of the most hated wuxia characters ever, depicted as foolish, selfish, incompetent, and vicious. Gwok Seung is widely popular, possessing the best of her parents' attributes.
Gwok Fu needs no explanation, but I've never warmed to the Gwok Seung character very much either. In characterizing Gwok Seung, Jin Yong seemingly tried too hard to make her the Anti-Gwok Fu. Gwok Seung was so perfect in every way that she's almost too good to be true...just as her elder sister is too awful to be true.
What if we were to replace the two Gwok sisters with a single character that combined attributes of both of them? This new young Gwok girl would be 70% like Gwok Seung, but retain 30% of Gwok Fu's characteristics as well. Would you find such a character more compelling than either of the Gwok sisters as we know them?