The way I see it, there are two general categories of wuxia heroes. One category is the Protector. The Protector hero is primarily interested in upholding justice and saving lives. They are often willing to kill, but do so only when necessary and don't particularly relish it (some might even have feelings of associated about it). Killers, on the other hand, will also protect, but they are more keen on punishing evil than protecting lives. Killers don't always kill, and they are still heroes after all so they generally don't kill wantonly, but they are much less hesitant about going lethal than the Protectors. If there is evil to be punished and lethality is the best option, the Killers will go after it with few reservations.
Here are lists of whom I characterize as Protectors and Killers among popular wuxia heroes:
Protectors
Deun Yu
Hui Juk
Gwok Jing
Yeung Gor
Cheung Mo Gei
Ling Wu Chung
Luk Siu Fung
Fa Mun Lau
Chor Lau Heung
Killers
Kiu Fung
Sai Mun Chui Sheut
Ding Pang
Lee Chum Foon
Ah Fei
Please add to these lists or discuss why a certain hero might belong more to one group or the other.