Chief, formally identified as Billy Banx Jr., supervises Noel Niihashi and Ninny Spangcole within Wing Bind, the organization managing dragons in Reverse London. He leads them in the Pipers division, focused on dragon conservation and harvesting.

Billy maintains a consistently laid-back, affable, and cheery demeanor with his subordinates. He frequently engages in light-hearted teasing, particularly targeting Ninny. Despite his quirky and easygoing exterior, he remains professionally committed to Wing Bind's mission of protecting Front London and Reverse London. His approach balances casual rapport with operational authority.

After Noel and Ninny defeated the Dark Dragon Shelby, Billy received a temporary promotion to Wing Bind's combat unit, the Sabres division. This advancement proved short-lived, as he was later demoted due to perceived laziness, highlighting his fluctuating position within the organization.

In operational matters, Billy prioritizes responsibilities decisively. He assigns critical field missions, such as dispatching Noel and Ninny to neutralize a Dark Dragon causing disturbances in Front London when Sabres personnel are unavailable. He vigilantly monitors their progress and intervenes directly to ensure civilian safety during emergencies. These actions reflect his underlying dedication to protecting residents across both Londons, despite occasional lapses in discipline.