Piguko is a young female Pigmon and one of the child characters in the Ultraman Kids group featured in the anime Ultraman Kids no Kotowaza Monogatari. She belongs to the community of young residents on the planet M7.8, a world located near the Land of Light, where the children study and play while working toward the shared goal of one day becoming proper Ultramen. Within this group, Piguko is a friendly and sociable child who is especially close to the two leading characters, Maa and Piko, and she quickly forms a warm friendship with another girl, Midori, soon after the two meet. This bond is a notable part of her identity and is even celebrated in the song Nakayoshi Piguko to Midorichan, which focuses on her closeness with Midori. Her role in the story is that of a supportive companion among the young heroes; she takes part in the everyday activities and adventures of the group and contributes to the cheerful, cooperative atmosphere of their world. As a Pigmon, a small, round monster species from the broader Ultraman universe, she has a gentle and approachable appearance that fits the show's playful tone. No extraordinary abilities or individual ambitions set her apart; her significance lies in her steady friendships and her place within the close-knit circle of children.