Thanks all of you, my friends.
To BAWTRM: You are very familiar with the Chinese history and Romance of the Three Kingdoms. Your guess work is great, and the correct name of my friend's minis are:
1, GuanYu
2, ZhangFei
3, ZhaoYun
4, HuangZhong
5, MaChao
6, MaChao too in 54mm scale.
To Dammanz: Do you mean LiuBei? LiuBei was the Leader of GuanYu. But his horse was named DiLu.