Jam Oji-san, affectionately called Uncle Jam, is a gentle and nurturing baker who operates a cozy forest bakery. A master of bread-making and mechanical engineering, he crafts intricate machines like the Anpanman Mobile. His distinct appearance includes gray hair, bushy eyebrows, a neat mustache, rosy cheeks, and a rounded nose, paired with his signature white chef’s hat, apron, and blue-gray shoes. He forged Anpanman by baking an anpan loaf imbued with a celestial “star of life” that landed in his oven, and he diligently replaces the hero’s head whenever it cracks or loses freshness—ensuring Anpanman can continue sharing his bread with those in need. Beyond this iconic creation, Jam engineers allies like Melonpanna and Rollpanna, gently guiding the latter toward kindness, and ambiguously contributes to Currypanman’s origin. His workshop buzzes with both culinary and mechanical ingenuity, honed through years of youthful exploration, enabling him to repair allies or devise tools for their missions. Though childless, he shares a home with Batako, a fellow fairy in their humanless world, and mentors younger creations like Creampanda with paternal warmth. Early manga portrayals once featured him puffing a pipe, a detail later phased out. Across tales, he remains a steadfast pillar of support, blending his dual talents to uphold hope and compassion through every loaf baked and gadget forged.