Panda-kun is a hamster distinguished by panda-like fur patterns that inspire his name. As the primary carpenter and builder for the Ham-Ham group, he constructs and repairs their structures. His most ambitious creation is the fully functional miniature Ham-Ham Fun Park, complete with rides and attractions. Additional notable builds include a sled, the Ham-Ham Express train, a refurbished jewelry house, Skyham's hang glider, and the Panda Car. His owner Mimi's family, who run a woodworking shop, provides access to construction materials. Gentle, sweet-natured, and subdued compared to other male Ham-Hams, he often prefers activities typically associated with females, such as knitting, and declines invitations to join games like acorn soccer. This inclination results in him being described as the most feminine among the boy Ham-Hams. He exhibits heightened sensitivity and emotional responsiveness, particularly regarding Mimi's well-being, becoming visibly distressed or motivated when she is upset, sad, or angry. He shares an exceptionally close bond with Mimi, the sole human who understands the Ham-Hams. She confides in him regularly, driving his determination to support her. He frequently mobilizes the entire Ham-Ham group to address Mimi's problems or fulfill her wishes, demonstrating loyalty and responsiveness to her emotional state. In early media like the "Tottoko Yoroshiku! Hamuchans" drama CD, Panda-kun harbored a crush on Bijou, expressing desires to build for her and questioning potential reciprocation. This romantic interest faded due to numerous rival admirers—notably Boss's dominant protectiveness—and Bijou's lack of romantic feelings toward him, portrayed as a brief phase early in the series. His construction projects anchor many episodes. Key builds include the Ham-Ham Fun Park (episode #19), a sled (#27), the Ham-Ham Express (#97), a refurbished jewelry house (#195–196), the Sweet Paradise Fun Park (debut #216, not definitively confirmed as solely his work), and Skyham's hang glider (#260). Episodes prominently featuring his role include "Panda's Ham-Ham Fun Park!" (#19), "Mimi's Dream Park!" (#65), "The Sunflower Ferris Wheel" (#66), "The Ham-Ham Express" (#97), and "Crossing the Sky, Skyham!" (#260). Panda-kun is the only Ham-Ham character whose name remains consistent across all regional adaptations, except in the Basque dub where he is called "Potxolo" (an affectionate term meaning "darling" or "beloved").