Voiced by: Kanae Itō (speaking), Momoko Tsugunaga (singing)
Height: 152 cm, Birthday: September 24, Blood type: O
Guardian Chara: Ran, Miki, Suu, Dia
Protagonist. A student of Seiyo Elementary (fifth grade at start of story). Her charm point is her "×"-shape hair clip. During Chara Change and Chara Become her hair clip changes (Ran→Heart, Miki→Spade, Suu→Clover) and the Chara Become forms are named: Ran→Amulet Heart, Miki→Amulet Spade, Suu→Amulet Clover, Dia→Amulet Diamond. The characters Amu becomes are good at certain activities like Amulet হৃদয় who is athletic, Amulet Spade...