Pigu-chan lives on the faraway planet K10 Nebula Chochii, home to young kaiju children. This character is timid yet kind-hearted, lacking special abilities like flight or fire-breathing but possessing strong loyalty and friendship. Pigu-chan consistently shows diligence and a willingness to help friends in need, working hard to support others.

Close bonds form with companions Kane-chan and Dada-chan. Together, they explore their world, attempt new activities, and navigate everyday challenges. Pigu-chan serves as an encouraging figure, using the motivational phrase "Wandabada!" to help overcome fears or hesitations, fostering courage during difficult moments.

Pigu-chan appears across multiple seasons of the main series, present from the initial season focusing on making friends and group activities. Later seasons introduce additional characters like Ele-chan while maintaining Pigu-chan's core role. The character also features in original net animations (ONAs) released via streaming platforms. A cameo occurs in the 2024 animated film, where Pigu-chan is part of a fictional children's program within that story's universe.

Merchandise including illustrated books and themed chopsticks further establishes Pigu-chan's identity within the franchise.