Amulet Heart is the Guardian Character associated with Hinamori Amu in Shugo Chara!. She represents Amu’s ideal self, embodying confidence, courage, and a sporty, energetic personality. In the series, Amulet Heart appears when Amu transforms with her Guardian Character, giving her enhanced agility and combat abilities. She plays an important role in helping Amu protect the Heart’s Eggs and confront the Easter Company’s schemes while also reflecting Amu’s inner growth and struggles with identity.