Kaco, a Roborovski hamster Sweetspet crafted from green macarons, sports light cream fur across his belly, tail, paws, and head, contrasted by lime-green ears and torso. His vivid green eyes complement a blue pearl necklace adorned with a spade-shaped emerald jewel.

Hailing from Sweetsland, he forms one-fourth of a quadruplet sibling group alongside Mako, Roko, and Koron. In cinematic lore, Kaco operates as a loyal subordinate to Duke Crème de Brulée, aiding the duke’s plots to usurp the Sweetsland Kingdom through espionage and sabotage alongside his siblings and allies like the Sweetspet Chocola.

Kaco debuted through minor appearances in the *Jewelpet Sunshine* Christmas episode and a *Jewelpet Kira☆Deco!* segment where he distributes confections. His narrative significance deepened in the film, featuring a pivotal sequence exposing his acrophobia during a high-stakes mission.

As a Sweetspet, his physiology enables rapid regeneration of damaged or consumed body parts through concentrated energy expenditure. His abilities and role align with the Sweetspet collective, drawing power from Sweetsland’s Candy Tower to specialize in spreading celebratory joy during seasonal festivities.