In the narrative, Pei Xiu serves as a Heavenly Official under Pei Ming in the Middle Court. Initially portrayed as composed and proud, he takes his responsibilities as a Martial God with utmost seriousness. Throughout the story, however, his reserved demeanor begins to unravel, revealing a more playful side, particularly after being poisoned by Xie Lian's food. Despite this setback, Pei Xiu remains resolute and committed to engaging in combat, even when severely hindered due to the poisoning. He holds deep reverence for Pei Ming and maintains amicable relations with Ban Yue and Xie Lian.