The cast of The Great Wall, comprising Matt Damon, Jing Tian, and Vinnie Jones, deliver solid performances, bringing depth and nuance to their characters. William, played by Matt Damon, is a rugged and resourceful mercenary, while General Li, played by Jing Tian, is a strong and determined leader. The chemistry between the leads is palpable, and their character development arcs are well-executed.