Guardian Characters

Guardian Characters are born from a child's Heart's Egg. A Heart's Egg is what holds the child's dreams, desires, and their would be selves. The heroine, Hinamori Amu, is a  Character Bearer. She has 4 Guardian Characters, Ran, Miki, Su, and Dia.

There are two types of Guardian Characters. One is the type of Guardian Characters born from a child's desire to improve themselves, like Daichi and Pepe (Kukai and Yaya's Guardian Characters.) The other type is born from the desire to change themselves or be reborn into someone new. For example, Amu's Guardian Characters and Kiseki (Tadase's Guardian Character)

If a child loses sight of his or her dream, their Heart's Egg will become a X egg. An X Egg influences the child, making them think that everything is hopeless or impossible. X Eggs are distinguished from the regular Heart's Egg and designed Guardian Egg by being dark in color and marked by an X. X eggs may sometimes also become a X Character. A X Character often attacks everything in sight using it's owner's shattered dreams.

There is also a type of egg known as a ? Egg. In the ''Shugo Chara! Doki!, ''Lulu de Morcerf uses a ruby necklce to create ? Eggs. ? Eggs causes the owner to believe that their dream has been fulfilled and Character Transform. Amu and her Guardian Characters Ran(pink) Miki(Blue), Su(Green), and Dia(Yellow).