Happa-chan

Happa-chan is a small fairy with short hair, a tunic, and a wand.
Happa-chan is a season-centered character, so she can change depending on Spring or Fall. During Spring, her hair is dark blue, her tunic is pink, and she stays in a flying four-leaf clover surrounded by small clovers. During Fall, she has brown hair, a yellow tunic, and utilizes yellow ginkgo leaves instead.
She has a romantic relation with Currypanman.

Happa-chan first appeared in the episode "Anpanman and Happa-chan" on February 17, 1992. She appeared few more times in the anime.

(Source: Anpanman Wikia)