Humple: about Xiao Feng's peak, that passage about him surprising himself was discovered after I started this topic. Technically, he did improve during the novel. However, the improvement was probably not that great, i.e. less than 10%, not a significant improvement. So, I should reword my statement to say: "Xiao Feng - the only protagonist to have reached 90% of his all-time peak at the introduction of his character."
How about Hu Fei, Yue Maiden Ah Qing, Wei Xiaobao, and the main character from Blade-Dance of the Lovers?XF- the only hero that didn't acquire his martial arts from a cave or increase his power by eating anything weird like animal parts.