SHUGO CHARA!

Summary

Amu Hinamori has two personalities: the one she shows on the outside that causes the other students at her new school to dub her "cool and spicy", and her true inner character, a shy and nervous personality that no one, not even her parents, knows about.
One night, Amu wishes that she could be who she wants to, instead of pretending to be the "cool and spicy" girl that everyone else knows. When she wakes up the next morning, Amu discovers what could be the key to fulfilling her wish: three brightly-colored eggs (red, blue and green) that each hatch into a Guardian Character, a little angel-like being born of Amu's desire to change. The three Shugo Chara – Ran, Miki, and Su – are each manifestations of Amu's "would-be self", the person Amu wants to become, and can use their powers to change Amu's personality as the situation requires, even enhancing certain abilities like sports and cooking – unfortunately, Amu has no way of stopping them.
Amu isn't the only one with a Shugo Chara, however – when Amu's crush Tadase finds out about Ran, Miki, and Su, he has her join the Guardians, Seiyo Elementary's student council, who Amu finds out is completely made up of kids who have Guardian Characters. And they have other, bigger responsibilities than just signing paperwork: their real job is finding and purifying X-Eggs, the Guardian Eggs born of troubled hearts, as well as searching for the Embryo, a special Guardian Egg said to grant wishes.
Also searching for the Embryo, however, is the Easter company, and they will stop at nothing to find it, no matter how many X-Eggs are created in the process.

ARC's
ARC 1: The Beginning- Chapters 1-14(Vol 1-3)
ARC 2: Amu's 4th Guardian Egg- Chapters 15-26(Vol 4-6)
ARC 3: Ikuto in Trouble? Final Easter Battle- Chapters 27-41(Vol 7-9)
ARC 4:Finding Amu's True Self!- Chapters 42-(Vol 10-)