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The Guardians are the student council of Seiyo Academy to protect the students and the school, and secretly keep the children's heart's eggs safe and preserve them while looking for the Embryo - the legendary heart's egg that has the power to grant wishes, as well as fighting against the Easter Company.

Each of the members has at least one Guardian Character to grant them special powers in tight situations.

The Guardians usually have special or secret meetings in the Royal Garden of Seiyo Academy.

This organization was founded by Seiyo Academy's principal, who is named Tsukasa Amakawa - the first King's Chair, also known as the Founding King.

Members

The Guardians are traditionally recruited with four kids with Guardian Characters in four positions known as the King's Chair, Queen's Chair, Jack's Chair, Ace's Chair.

When a person with three Guardian Characters appears, which is Amu, that person will take the position of Joker's Chair with special missions to attend. Most specifically cleanse those heart's eggs whose owners have tainted with an X.

King's Chair

Tadase Hotori
Kiseki - Tadase's Guardian Character

Queen's Chair

Rikka Hiiragi
Hotaru - Rikka's Guardian Character

Jack's Chair

Kairi Sanjo
Musashi - Kairi's Guardian Character

Ace's Chair

Yaya Yuiki
Pepe - Yaya's Guardian Character

Joker's Chair

Amu Hinamori

Ran - Amu's first Guardian Character
Miki - Amu's second Guardian Character
Su - Amu's third Guardian Character
Dia - Amu's fourth Guardian Character

Guardian Apprentices

Guardian Apprentices are later introduced in the anime as most of the Guardians will be graduating at the end of the series, leaving Yaya as the only chair left.