Melonpanna, crafted from melon bread, wears a dark green uniform accented by light green gloves, boots, and a distinctive cape featuring green on top and orange underneath. A cursive "m" insignia adorns her dress. Her face displays large green eyes, a small green nose, three diagonal cheek lines, and two small orange hollow diamonds framing her face.

She embodies extreme kindness and sensitivity, typically avoiding confrontation but capable of using her powers when necessary. Lingering loneliness stems from infrequent contact with her deeply admired older sister, Rollpanna, her primary source of emotional support. Melonpanna also acts as a nurturing foster sister figure to Creampanda.

Her primary ability, the Melo-Melo Punch, pacifies foes by inducing affection or paralysis and can awaken individuals from deep sleep. She produces Melo-Melo Juice from her head; its droplets reverse the effects of Baikinman's "blackening" influence on allies, though this healing power falters when Baikinman corrupts Rollpanna's inherent goodness. She shares the common flight capability of major heroes.

Within the hero team, Melonpanna holds a younger sibling role to Anpanman, collaborating with him and allies like Currypanman and Shokupanman on missions. Their dynamic emphasizes mutual support and mentorship.

In *Soreike! Anpanman: Buruburu no Takarasagashi Daibōken!*, Melonpanna participates in the Buruburu-led treasure hunt, assisting Anpanman and others against Baikinman's interference.

Trivia notes include occasional depictions casting her as a "damsel in distress," drawing parallels to characters like Princess Peach. Inspirations include Candy Candy and Gerda from *The Snow Queen*. Her design and name originate from the melon pan sweet bun.