Originating from melon bread, Melonpanna possesses a distinctive appearance featuring a dark green uniform accented in light green on her belt, shoes, and gloves. Her outfit includes a cape with a green top and orange underside. Notable facial characteristics encompass large green eyes, a small green nose, three diagonal crossing lines, and two small orange hollow diamonds framing her face. A cursive "m" insignia, resembling a Cyrillic "T", adorns both her dress and uniform. She stands shorter than many allies yet taller than Akachanman and Creampanda.

Her personality centers on profound kindness and sensitivity, leading to a dislike of fighting despite her super strength, though she engages without hesitation when necessary. A recurring emotional element involves deep loneliness stemming from separation from her older sister, Rollpanna, whom she deeply admires but rarely encounters.

Melonpanna shares the flight ability common among bread-based heroes. Her signature Melo-Melo Punch induces affectionate drowsiness to paralyze adversaries or awaken individuals from deep sleep. By squeezing her head, she produces curative Melo-Melo Juice droplets capable of reversing "blackened" states caused by Baikinman's tricks; this power fails only when Baikinman manipulates Rollpanna's good heart.

Key relationships define her narrative functions: Rollpanna is her sister, uniquely calmed by Melonpanna during distress. Creampanda serves as her foster brother and closest companion. Anpanman acts as her primary rescuer during peril, while Cheese is another frequent companion during leisure.

Her narrative role frequently positions her as a rescue target. Her presence often triggers Rollpanna's transition back from evil-hearted states. Specific vulnerabilities include fear reactions to bandage-based attacks. Her curative juice and calming influence provide essential support during team crises.