Happa-chan is a small fairy best known for her seasonal transformations. She's got short hair, wears a tunic, and carries a wand wherever she goes.
Her whole thing is that she changes based on the season. In Spring, she's got dark blue hair and a pink tunic, and she floats around in a flying four-leaf clover surrounded by smaller ones. Come Fall, her hair turns brown, her tunic switches to yellow, and she trades the clovers for yellow ginkgo leaves instead.
She's in a relationship with Currypanman.
Happa-chan debuted in the anime episode "Anpanman and Happa-chan" on February 17, 1992. She's made a handful of appearances since then, though she never became a major recurring character.
Content compiled by AnimeList.moe from publicly available sources.