Name an actor and his signature role in a drama. By this, I mean the one that made him famous or one you would most recommend to others so they have the best chance of appreciating his talents/versatility/looks/etc. as much as you might. Some actors may have more than one.
I'll start with examples using some of my own favorite actors:
Bao Jian Feng - Gu Yue Tao in Shi Ba Sui De Tian Kong (Sky)
Shen Xiao Hai - Tao Zui / Tao Ge Ge in Hua Gu Zi
Tang Guo Qiang - Zhuge Liang in San Guo Yan Yi (Romance of the Three Kingdoms) 1994 and Yong Zheng in Yong Zheng Wang Chao
Wallace Chung - Gu Xi Zhao in Ni Shui Han and Zhui Ming in Si Da Ming Bu (The Four Detective Guards)