Coopa dedicates herself as Melt's assistant within Jil's adventuring party. Her main duty involves carrying Melt's numbered magic rods, much like a golf caddie transports specialized equipment. She shows unwavering loyalty to Melt, even while frequently displaying visible disapproval of his self-centered and irresponsible actions.

Beyond supporting Melt, Coopa significantly aids the party through her culinary skills. She prepares nutritious meals by combining standard rations with monster meat gathered during their travels, ensuring the climbers maintain strength for the tower ascent. Despite being only ten years old, she exhibits maturity beyond her years and maintains a consistently enthusiastic attitude.

Coopa possesses surprising physical strength disproportionate to her small stature. She occasionally leverages this strength during combat or when confronting challenges requiring brute force. This trait, combined with her serious approach to responsibilities, creates an occasional contrast with other party members. Her presence offers practical support and grounded energy within the group.

Throughout the television seasons "The Aegis of Uruk" and "The Sword of Uruk," and the OVA "Jil no Bouken," Coopa maintains a consistent supporting role. Her core functions, relationships, and personality remain consistent across this official media.