Yō Uei, a disgraced former police officer from the pre-petrification era, gained notoriety for his reckless trigger discipline and blatant flouting of protocol—routinely shooting fleeing suspects and urinating publicly. His misconduct culminated in a forced resignation. Petrified mid-act while relieving himself on a wall, he was revived by Tsukasa Shishio and enlisted into the Empire of Might as an enforcer, overseeing prisoners like Chrome. Following Chrome’s escape, he staged his own death to evade retribution, fleeing until encountering Homura and infiltrating the Kingdom of Science under the guise of amnesia. Brash and condescending, Yō openly scorned those he considered backward, clashing fiercely with Magma over ideological divides. Though cowardly and resistant to physical labor, he displayed flashes of loyalty, directing subordinates to shift blame onto him post-escape and assisting Yuzuriha in restoring petrified statues as atonement. Skilled with tonfas and firearms, his marksmanship faltered post-revival, requiring retraining. During the Treasure Island conflict, he mishandled a firearm—accidentally shooting a snake—before refining his aim. His pivotal intervention disarmed Ibara by shattering the petrification device, though the act led to his temporary petrification. In subsequent missions, Yō blended dark humor with pragmatism, gambling impulsively and grumbling about manual work, yet rallying during crises—enthusiastically craving meat amid alligator attacks. His rivalry with Magma endured, often escalating to brawls. Surviving a gunshot wound while aiding South American petrification efforts, he was later petrified globally. Revived nine years post-event, he aided reconstruction through farming and crafting a computer, though his impatience for meticulous tasks lingered. Yō’s arc traced a jagged path from self-interest to reluctant allegiance. Motivated by status yet gradually integrating into the Kingdom of Science, he honed his shooting skills to contribute to critical missions. His law-enforcement past fueled aspirations to establish a police force in the Stone World, merging his experience with the era’s demands.