Usako is a minor character appearing in the 1991 animated film "Soreike! Anpanman: Tobe! Tobe! Chibigon" within the Anpanman universe. Visually portrayed as a young rabbit, the character is identified by distinctive rosy cheeks. Usako attends elementary school in the series' setting, regularly interacting with the teacher Mimi-sensei and classmates Kabao-kun, Chibi Zō, and Pyonkichi, establishing a role within the school group dynamics. The character design incorporates rabbit features, though specific details beyond the rosy cheeks are not elaborated upon. The documented materials do not provide further background story, character development, or information on an expanded role across other seasons, movies, OVAs, or spin-offs.