Melon Panna, originating from melon bread, wears a distinctive green uniform featuring a light green belt, gloves, and shoes. Her appearance includes a dark green cape with an orange underside, a cursive "m" insignia on her chest, large green eyes, a small green nose, three diagonal lines crossing her face, and two small orange hollow diamonds on her cheeks.

She possesses a softhearted, caring, and sensitive personality, occasionally demonstrating cleverness. While generally gentle and averse to conflict, she will employ her abilities when necessary to defend herself or others. Her primary powers are the **Melo-Melo Punch**, which disorients adversaries by inducing affection or awakening individuals from deep sleep, and **Melo-Melo Juice**, droplets squeezed from her head that cure allies affected by darkening or corruption. This juice only proves ineffective when an adversary nullifies the inherent goodness in Roll Panna's heart.

Key relationships define her character. Roll Panna is her older sister, whom she deeply admires but seldom sees, leading to frequent loneliness. Melon Panna uniquely calms Roll Panna during distress. She views Anpanman as an older brother figure and ally, often relying on his help in peril. Creampanda is regarded as a younger sibling or close companion, and she occasionally interacts with Cheese, Anpanman's dog.

In challenging situations, Melon Panna typically requires rescue by Anpanman or other allies. If unavailable, she summons Roll Panna for assistance. Her name derives from "melon pan", a Japanese sweet bun.