Gambull

Gambull (ガムブルル, Gamubururu) is a bounty hunter and a veteran member of the organization known as Deathwatch, and acts as the leader of the Cowsino Bounty Hunters. Gambull has wanted to be a bull for his entire life and will do anything to accomplish this goal, from dying his skin the same color as a cow to wearing an iron bull mask (as well as to make himself more intimidating). He even joined Deathwatch due to Erik Khan promising to make him a real cow if he desires to, but until then, he must enjoy simply cosplaying. He was given charge of the artificial Cowsino Island, which was used to trap The Marimo Pirates not too long after their defeat of the Sirius Bounty Hunters. He was eventually defeated by D'Artagnan and Sid Cheney, as well as some damage from Dhahaka D. Knave.

He acted as the main antagonist of the Knave's Fever Arc in Grand Voyage.