Zammie acts as chief enforcer for the antagonist Buccaboo, directly participating in harassing goblin villagers and upholding Buccaboo's oppressive rule. He initially displays a consistently grumpy and menacing demeanor while executing Buccaboo's orders.

Zammie's past reveals he once served as an angel before falling from heaven; the fall resulted from accidentally slipping on a piece of chocolate, costing him one golden wing during the descent. This loss left him flightless and vulnerable, leading to his capture and subsequent corruption by Buccaboo. Buccaboo exploited Zammie's remaining heavenly powers, amplifying his own strength while manipulating and coercing Zammie into serving as a key instrument for his destructive plans against the goblins.

A pivotal shift occurs when Coco and the goblin Chaley uncover Zammie's true identity as a fallen angel and recognize his actions stem from external control. They intervene to free him from Buccaboo's influence, aiding his escape from the lair. This marks the start of Zammie's redemption, transitioning him from antagonist to ally against Buccaboo.

Recovering his missing golden wing becomes essential for Zammie to regain his full abilities and return to heaven. Coco retrieves the wing through flight, facilitated by a spiritual connection to her father's memory. Reunited with both wings, Zammie ascends back to heaven. This act severs Buccaboo's access to the siphoned celestial power, directly contributing to Buccaboo's defeat.

Zammie's story concludes with his departure from the earthly realm and the goblin world upon regaining his angelic status, his role in the conflict resolved.