Melonpanna, a figure with a melon bread head and a gentle spirit, originated through the rare Flower of Pure Heart—a decade-blooming entity granting bread beings selfless courage. Her essence melded into her sister Rollpanna’s creation when Melonpanna infused the dough with her melon juice, aspiring for Rollpanna’s heroic destiny. Yet Baikinman’s sabotage tainted the mixture with Bacteria Grass, fracturing Rollpanna’s heart into opposing halves of virtue and malice.

Melonpanna wields the Melo-Melo Punch, a strike that pacifies foes through disarming affection or rouses allies from slumber, and secretes Melo-Melo Juice from her head—a curative antidote against Baikinman’s corruption. These powers falter only when Rollpanna’s benevolent heart is subdued. Their bond anchors their fates: Melonpanna’s voice or presence restores Rollpanna’s goodness, while encounters with Anpanman trigger her sister’s darker impulses.

During the floating cloud castle crisis, Melonpanna confronts Rollpanna’s metamorphosis under Bacteria Grass’s surge, which merges her split hearts into a hybrid form marked by a turban’s stark "B." Melonpanna combats this corruption through emotional ties and healing droplets, her resolve tested yet unwavering.

As a foster sibling to cream bun-headed Creampanda and ally to Anpanman’s team, Melonpanna dons a green uniform adorned with a cursive "m" and a gradient cape mirroring her melon bread hues. Though pacifistic, she faces crises with quiet determination, leaning on companions while remaining pivotal in tempering her sister’s turmoil.