Böri Khan is the main antagonist of the 2020 live-action remake of Mulan. He is the warrior leader of the Rourans who is intent on avenging his father's death. Conversely, however, he is more misogynistic than Shan Yu, as evidenced by his lack of acknowledging Mulan as a warrior simply calling her a girl and his mistreatment of Xianniang, a witch he recruited into his army, and who is the primary reason his forces have an advantage for a while.
Role in the film
Böri Khan is first seen riding on his horse in the Silk Road approaching a group of guards protecting a garrison, followed by a group of Rourans on the attack while the guards attempt to protect the fort from the Rourans where one of the archers attempts to fire an arrow at him only for Böri Khan to catch it to avoid getting hit. Böri Khan and his army take on the guards starting an ambush on the Silk Road. Later, Xianniang reports to Böri Khan at the Rouran Camp that the Emperor is sending his army to fight back as Böri Khan plans to kill the Emperor, which he tells her to help him finish as Xianniang agrees to help Böri Khan succeed his mission.
The next day, Böri Khan welcomes the twelve leaders of the Rouran tribes planning to kill the Emperor while relying on Xianniang whom the other Rourans think she cannot be trusted which Böri Khan tells the soldiers that Xianniang serves the Rourans just as Böri Khan plans to take revenge against the Emperor after surrendering to their last battle as well as avenging his father's death after the Emperor killed him which the Rourans ready themselves for revenge. Later, Xianniang, who transforms into her human form, tells Böri Khan that she serves him just as Böri Khan shows Xianniang the next garrison, telling her to destroy it.
Later, Böri Khan returns to the Silk Road to bring in the Rouran army to destroy the marketplace, just as the Rourans continue their attack in the marketplace while Xianniang takes on more guards on the garrison, causing a lot of damage to the marketplace. Having ransacked the marketplace, Böri Khan and his troops continue proceeding to fight against the Imperial Army where the Rourans face the Imperial Army in front of them just as both armies clash against each other throughout the battle. Although Mulan tricked the Rourans into firing a flaming boulder to hit a snow-capped peak to cause an avalanche to engulf the Rourans, Böri Khan is shown to have survived the avalanche just as he and the Rourans raid the Imperial City to kill the Emperor.
Böri Khan approaches the Emperor who is planning to kill him after having killed his father, which Böri Khan orders the Rourans to kill the Emperor just as they tie him up, leaving him unable to attack just as the Böri Khan commands his soldiers to kill the soldiers of the Imperial Army. Later, Mulan follows Xianniang to the workshop where the Emperor is held hostage just as Xianniang confronts Böri Khan in combat, which he kills Xianniang in progress for betraying him with his arrow. After Xianniang dies, Mulan takes on Böri Khan by herself in battle where he confronts her in a sword fight. During the duel, Böri Khan causes Mulan to lose her sword as it drops into the molten lava, causing the sword to melt. The Phoenix then helps Mulan fight against Böri Khan to which as she continues fighting with determination, to which during battle, Mulan retrieves Böri Khan's own sword and cuts the rope to cause the platform he is standing on to fall down from high below while Mulan saves the Emperor. Böri Khan attempts to fire an arrow at Mulan, but the Emperor catches it; ultimately, Böri Khan was killed by his own arrow when Mulan redirected it back at him after he tried to shoot the Emperor with it. With the Rourans defeated and Böri Khan killed, the Imperial City celebrates their victory with the Imperial Army winning the battle.