Shû Bi served as High Diviner and magistrate within the Rekka Imperial Palace, directing military retrieval operations for Rakuho capsules. He and childhood friend Kai Rhodan endured slavery and imprisonment fifteen years prior after their northern village failed its taxes. Fueled by a pledge to reform Rekka from within, they rose to power. Shû Bi leveraged scientific calculations to predict capsule landings, enabling Rekka to manifest Briheight units and crush rebels.

He appears as a young man with long light lilac hair and cyan eyes, often clad in a distinctive white and purple long robe. His personality blends sharp intellect with eccentricity, marked by relentless fascination for secrets and unpredictable phenomena. This drove his betrayal of Rekka and Emperor Zetsu Daidan upon encountering Back Arrow, whose quest to breach the World Wall captivated him. Despite his keen mind, Shû Bi possesses notably poor stamina, tiring swiftly from even light exertion.

His conviction, "I think, therefore I am," manifests uniquely through his Briheight ability, which transfers his consciousness into an autonomous doppelgänger instead of generating combat armor. After joining the dreadnought Granedger's crew, he embraced the role of an obsessive secret discoverer, dedicated to witnessing Arrow's journey. He provided tactical support, such as placating Bit Namital by bestowing the hollow title "Admiral of Tactics" to maintain morale. Shû Bi evolved from loyal bureaucrat to a wanderer prioritizing personal intellectual pursuits, maintaining underlying loyalty to Arrow's mission while leveraging scientific expertise and philosophical conviction to navigate conflicts.