Amu Hinamori

Because of her three Guardian Characters, Amu became a member of the Guardians, the school's student council, although she refused to join at first. Amu's position with the Guardians is the Joker. Her task, as the Joker, is to search for and purify X Eggs, X Characters, and in the second season, Mystery Eggs, the corrupted forms of people's would-be selves. Ran, Miki, and Su help Amu with her task through a process called a Character Transformation, which is enabled by the Humpty Lock and grants Amu special abilities depending on the Guardian Character. Later on, Amu also creates a fourth egg, known as Diamond.