Melonpanna, a character from the Anpanman franchise, possesses a head made of melon bread, a sweet bun coated in crispy cookie dough. She wears a distinctive dark green uniform accented by a light green belt, gloves, and boots, complemented by a cape featuring a green exterior and orange interior. Her uniform bears a cursive "m" insignia. Her face displays three diagonal lines and large green eyes, with two small orange hollow diamonds on each side.

She embodies a gentle and sensitive personality, consistently showing kindness to others. While generally reluctant to fight, she shows courage when needed. Melonpanna often experiences loneliness stemming from infrequent encounters with her older sister, Rollpanna, and demonstrates strong protective instincts toward her younger foster brother, Creampanda.

Her primary ability is flight, common among caped heroes in her world. Her signature technique, the Melo-Melo Punch, induces affection in adversaries or awakens individuals from deep sleep rather than causing harm. By squeezing droplets from her head, she generates Melo-Melo Juice, which reverses the effects of Baikinman's "blackening" influence on allies. This curative power only fails when Baikinman has specifically negated the power of Rollpanna's good heart. Melonpanna uniquely addresses Rollpanna as "sister" and possesses the capacity to calm her during moments of distress.

Relationships significantly shape her character. She views Anpanman as both an ally and a mentor. Her dynamic with Rollpanna evolves throughout the series; initially separated due to Rollpanna's conflicting hearts and nomadic lifestyle, their bond strengthens in later episodes. Melonpanna interacts with Creampanda within an edutainment context, participating alongside Anpanman in educational activities.