The main protagonist of the story, Amu Hinamori, is a female student attending Seiyo Elementary. At first glance, her classmates refer to her attitude and appearance as "cool and spicy" and rumors speculate about her personal life. However, her real personality is that of a very shy girl who has trouble showing her true personality. One night, Amu wishes for the courage to show her "would-be" self, and the next morning, she finds three brightly colored eggs — pink, blue, and green — in her bed. These eggs hatch into three fairy-like guardians called "Shugo Charas" (Guardian Characters): Ran (pink), Miki (blue), and Su (green). The Guardian Characters aid Amu in discovering who she truly is and help fulfil Amu's dreams. Amu's life becomes much more complex, as she struggles to deal with her "would-be" selves and Seiyo Elementary's Guardians, who each have a Guardian Character of their own. People with Guardian Characters can "chara-nari" (character transform) or "character change". Each transformation has special powers, mainly for attacking or defending. Character changes have special powers too, but have more practical uses. Later on, they recruit Amu as the "Joker" to search for X Eggs and X Characters, the corrupted forms of people's dreams, so the Guardians can purify their dreams. In Japanese, the egg is shortened.