Jin Ling is rich, semi-spoiled and constantly angry. Takes more after his uncle (Jiang Cheng) than his kind mother (Jiang Yanli). He's still young, though. Wei Wuxian (one of his many uncles) has decided to try to fix the worst aspects of his personality. Great archer, and he's good at deceiving Jiang Cheng, so that's something.
"The young man had thin brows and almond eyes. His features were handsome in a sharp way, and his eyes held a composed vigor, with a slight intention of attack, appearing to be two bolts of lightning as he stared... Even his posture emitted an air of arrogance and overconfidence."