Jiang Cheng, courtesy name Jiang Wanyin, is the current leader of the Yunmeng Jiang Clan and Jin Ling's maternal uncle. He is also known by his title, Sandu Shengshou. He is the younger child of Jiang Fengmian and Yu Ziyuan, Jiang Yanli's younger brother, the brother-in-law of Jin Zixuan, and the younger martial brother of Wei Wuxian. 

He is serious, cold, ambitious, short tempered, strict, hot headed, prideful, and always frowning.

He's also a misunderstood character and workaholic.