Xiao Feng is yang
Duan Yu is ???
Xuzhu is yin (Shen Si Fu) AND yang (Tianshan 6 Yang Zhang)
Guo Jing is yin AND yang ???
Yang Guo is yang
Zhang Wuji is yang
Shi Potian ?
Linghu Chong ?
Di Yun ?
Chen Jialuo ?
Hu Fei ?
More heroes seem to be yang, which is to be expected since they are chivalrous warriors. A few are balanced. While some others, I'm not sure.