Cheng Yin

Cheng Yin is an officer who once served Han Sui. He follows Ma Chao to serve Zhang Lu and eventually surrenders with Pang De to join Cao Cao.

Romance of the Three Kingdoms
In the novel, he is one of the Eight Riders of Han Sui. Together with Ma Chao's army, he forces the surrender of Chang An. He later fights against Cao Cao at Wei Nan but he and his companion, Zhang Heng, are killed.