"Brutal Bull" Ucy

A hulking bovine with dark fur and a heavy frame, Ucy sports a pair of long horns, the left of which is eventually snapped off by Hajrudin. His eyes are small, each ringed by three short lashes.

Gatz dubs him the Grim Reaper of the arena, and the savage way he fights earned him the title of Brutal Bull. Even so, Luffy manages to calm and win him over by unleashing his Supreme King Haki.

Long before the C Block battle royale, the bull had already cut down numerous death row inmates inside the Corrida Colosseum, a record that speaks to his ferocity. He entered the tournament that offered the Mera Mera no Mi as its prize and was sorted into C Block. Mid-brawl, Luffy, disguised as the gladiator Lucy, leapt onto the animal and christened him Ucy, riding through the crowd and scattering rivals. The pair accidentally collided with Hajrudin's leg, prompting the giant to retaliate, slam them both down, break the bull's left horn, and knock it cold, after which an enraged Lucy floored Hajrudin with one punch and carried his friend to safety. Following treatment for his wounds, Ucy reemerged once Doflamingo sealed Dressrosa in his birdcage, recognized Luffy, and joined the assembled Colosseum fighters charging at Pica. With Luffy, Zoro, Law, and others on his back, he scaled Pica's stone body, only to be later cornered and struck unconscious by Doflamingo before Abdullah and Jeet arrived to rescue him.