Hai Feng showed considerable talent in martial arts and could endure hardships.
At least, during the Foundation Establishment Stage, his speed was faster than others', a benefit stemming from the mana inside his body, which allowed him to recover physical fatigue more quickly than ordinary people.
Sun Wukong's eyes revealed some thoughtfulness, "Not bad, this youngster being chosen by the fiendish spirit of Moro does show he has some talent, though he still has an innate aversion towards non-human demons."
This aversion was not just an internal thought, but also evident on his face.
Whenever martial artists from the demon tribes came close, his expression would darken, clearly showing his dislike for demons.
Theoretically speaking, the demons of Huaguo Mountain, before the third month, had been requested by him to further their transformations, that is, to retain only their racial traits like Ao Yun.