Amu Hinamori (日奈森 亜夢, Hinamori Amu?), the series' protagonist, is a student of Seiyo Elementary. Amu's classmates see her as "cool and spicy", but Amu is actually extremely shy and timid. Part of the reason for this misunderstanding is the trendy punk goth clothing her mother buys for her as well as the way in which she expresses her shyness and avoids doing new things which people interpret as 'cool'. However, when Amu wishes for the courage to be reborn as her would-be self, three colorful eggs appear the next morning, which hatch into Amu's three Guardian Characters: Ran, Miki, and Su. When one of her Guardian Characters Character Changes with her, she gets embarrassed because they make her speak in ways that she thinks are "totally out of character".
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, Wishing 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. In the second season, when Amu shows her true potential, the Humpty Lock will increase it's power. Thus, new transformation scenes are used. In Shugo Chara!! Doki- it is often mentioned that Amu has changed somehow by only the people who 'notice her'.
Amu's primary rival is Utau Hoshina, an idol singer for Easter who is jealous that Ikuto shows an interest in Amu instead of her, but later they become good friends.
Amu's two main love interests are Tadase Hotori and Ikuto Tsukiyomi. Tadase in chapter 28 asked her if he could like her as herself (not as Amulet Heart) and in the same chapter Amu asks Ikuto if he has someone he loves and he says that that one is her, but Amu doesn't believe him. In the recent manga chapters Amu and the guardians are trying to save Ikuto from Easter.
Amu Hinamori,is student of Seiyo Elementary. Amu was seen as a cool and stylish girl and has become popular at school but what she really is is just a shy, gentle, docile, and extremely normal girl. The main reason for this misunderstanding is the trendy punk clothing her mother buys for her. One night she wished she was not the type of person she currently was, and on the next morning, three Guardian Eggs appeared
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