Pico, a young hamster child, lives in Watermill Village with friends Tocho and Fufu. Small and wide-eyed, Pico possesses a notably cute and diminutive stature, often highlighted by a bright pink bow and pink pants that create an overall cheerful appearance. This design embodies the "Ridiculously Cute Critter" trope.

Personality-wise, Pico radiates consistent energy, optimism, and excitement, aligning with the "Genki Girl" archetype. Though initially frightened upon encountering the giant flying fish Aesop, Pico swiftly embraced enthusiastic friendship and proactive dedication to help recover Aesop’s lost mystical scales. Demonstrating strong empathy—especially toward animals—Pico acts as the trio’s emotional core, actively encouraging friends during moments of discouragement or hopelessness throughout their quest. A curious, adventurous spirit drives Pico to eagerly explore new environments like mountain flower fields and dive into missions despite potential dangers.

Functioning as a "Supporting Protagonist," Pico remains central to the scale-retrieval quest while primarily facilitating encounters with characters from Aesop’s fables and absorbing their moral lessons. This journey fosters subtle growth, showcasing rising confidence in instincts and problem-solving. Resourcefulness and adaptability emerge in navigating challenges, reflecting a practical, observant approach.

Pico resides in Watermill Village. The adventure begins with a planned mountain picnic alongside Tocho and Fufu, leading to an accidental fall into a hidden lake where Aesop is discovered. This incident sparks the quest to gather scattered scales, motivated purely by Pico’s compassionate desire to restore Aesop’s ability to fly.