Introducing Musashi (ムサシ)

Kairi's Guardian Character. Musashi has traits and the personality of that of a samurai. He also has some of Kairi's traits, such as green hair and glasses. When he Character Transforms with Kairi, they become Samurai Soul. In the anime television series, Musashi is voiced by Nobuhiko Okamoto.

Introducing Kairi Sanjo (三条 海里, Sanjō Kairi)

Kairi Sanjo replaces Kukai as the new Jack's Chair when Kukai leaves for middle school. Kairi is tall, despite being two years junior to Amu. Unlike the spontaneous Kukai, Kairi is uptight, very organized, and blunt about faults. Even with these traits, he is so capable that Amu and Yaya call him "Class President"

Kairi is the younger brother of Yukari Sanjo and was sent to spy on the Guardians. This wasn't his choice though, as Yukari immediately begged him to transfer to Seiyo upon discovering that he had a Guardian Character. Since his sister is busy at work, Kairi takes care of the household work (and his sister) in her apartment. However, when he saw the true meaning of his "missions," he tries to rebel against Yukari, but not before he reveals his secret to the Guardians when they accidentally discover him with Pestering CDs. He switches sides after Amu convinces him he is a good person. Afterward, he leaves saying that he promised his parents and local classmates that he would return, but not before declaring his love for Amu, saying that he shall return for her when he has become worthy of a man. He also declared a rivalry toward Tadase. Recently in Chapter 44, he is shown in Amu's town looking for Yukari and comments about also looking for "that person". In chapter 45, he becomes the adviser for Yuu Nikaido and Yukari Sanjo, who are arguing about getting back together. In chapter 46, he returns to the academy to meet with Tsukasa, meeting Hikaru and Yaya on his way. In the anime television series, Kairi is voiced by Mitsuki Saiga. He is portrayed by Reo Sawada in the musical.

Introducing Kusukusu (クスクス)

Kusukusu is Rima's Guardian Character and represents Rima's desire to make others laugh. When she Character Changes, Rima becomes a gag character (which she is embarrassed to use) and uses a signature phrase and pose: "Bala-Balance" (Balancing Balance) from the magazine Great Gag Manga King (ギャグマンガ大王, Gyagu Manga Daiō). During Character Transformation, Rima becomes Clown Drop. In the anime television series, Kusukusu is voiced by Sayaka Narita.

Introducing Rima Mashiro (真城 りま, Mashiro Rima)

Rima Mashiro replaces Nadeshiko as the new Queen's Chair. Although Rima is the same age as Amu, she is extremely petite and has relatively poor athletic ability. Most of the boys in her class admire her because of her beauty and passive personality, while the girls are annoyed by her because of her selfishness.

Because of a kidnapping incident that happened before she transferred to Seiyo Elementary, her parents pick her up after school, but since it interferes with their work schedules, they often argue about who cares more for Rima over work, resulting in Rima often having no one but Kusukusu as company for her secret interest in gag comedy. Later, she opens up to Amu and becomes friends with her.

When Yaya explains to Rima about Amu and Nadeshiko's friendship, she appears to be jealous. At first, she is shown to have great dislike for Nagihiko because Amu told Rima and Yaya that he is Nadeshiko's twin brother due to a confusion between the two. That leads Rima to be protective over Amu. She tells Nagihiko that he is useless because his Guardian Character is still inside an egg, but gains respect and trust for him later on. Rima discovers that Nadeshiko and Nagihiko are actually the same person. She performed a join attack with "Nadeshiko" called queen's waltz. In the anime television series, Rima is voiced by Sayuri Yahagi. She is portrayed by Karen Yagishita in the musical.

Introducing Pepe (ぺぺ)

Pepe is a baby-like Guardian Character who was born from Yaya's desire to remain baby-like in nature. When either she or Yaya get hurt or something goes wrong, both of them will begin to whine and cry in unison. During Character Transformation, they become Dear Baby. In the anime television series, Pepe is voiced by Kimiko Koyama.

Introducing Yaya Yuiki (結木 やや, Yuiki Yaya)

Yaya Yuiki is the childish girl serving as the Ace Chair and is one year junior to Amu. Yaya often acts immature for her age, such as having an enormous sweet tooth, a great soft spot for items like ribbons, as well as tending to be hyperactive. She is also a ballerina, though a rather clumsy one. She has a newborn baby brother named Tsubasa, who, she claims, gets all her parents' attention. It is because of this that her baby-like Guardian Character, Pepe, was born. Though she acts jealous around Tsubasa, Yaya does have a responsible side, once personally taking him to the doctor when he had a fever, as no other option was possible. In the anime television series, Yaya is voiced by Tomoko Nakamura. She is portrayed by Meimi Tamura in the musical.

Introducing Daichi (ダイチ)

Kukai's Guardian Character is Daichi. He is very good at sports and cannot seem to sit still. He was born when Kukai wanted to do many sports but had to choose. When Daichi and Kukai Character Change, Kukai becomes even more athletic. When Kukai and Daichi return for a visit, they Character Transform with the power of the Humpty Lock, becoming Sky Jack. In the anime television series, Daichi is voiced by Hiroyuki Yoshino.

Introducing Kukai Soma (相馬 空海, Sōma Kūkai)

Kukai Soma is the upbeat and energetic Jack's Chair of the Guardians. One year senior to Amu, Kukai helps Amu with her training as the Joker. Although he was the captain of the soccer club, Kukai loves and excels at all sports. At the end of the school year, Kukai graduates and goes on to middle school. However, Kukai returns to visit the Guardians from time to time. He also becomes good friends with Utau after they go to a ramen eating contest together. In the anime television series, Kukai is voiced by Atsushi Abe. He is portrayed by Yuuta Koseki in the musical.

Introducing Rhythm (リズム, Rizumu)

Rhythm is Nagihiko's second Guardian Character. Rhythm appears to be cool and outgoing, showing Nagihiko's boy self. However, he might also be quite a flirt, as is shown when he hugs all of the female guardian chara's after just meeting them. Rhythm's egg was first seen in chapter 30 and in episode 56, but as of chapter 34 and episode 91, he hatches after Nagihiko remembers how much he liked playing basketball, at his own pace and rhythm, while fighting against a X Character. During Character Change, huge headphones appear around Nagihiko's neck, and he gains an energetic persona; he also doesn't seem to hesitate in participating in athletic activities, and goes all out dominating several sports such as soccer, baseball, tennis, and judo. This causes most of the sports clubs to become obsessed with recruiting Nagihiko to their teams, much to his dismay. When in a Character Transformation, they become Beat Jumper. In the anime television series, Rhythm is voiced by Kōki Miyata.

Introducing Temari (てまり

Temari is Nagihiko's first Guardian Character. Temari appears to be elegant and Nagihiko's desire to be more mannered and become a Japanese dancer. However, during Character Change, both Temari and Nagihiko (as Nadeshiko) become aggressive and very masculine; Nagihiko, inadvertently, also gains a naginata, which he promptly uses. Prior to Nagihiko's return to the guardians, Temari went back into her egg to slumber. In chapter 34 and episode 98, Temari wakes up after Nagihiko realizes that it doesn't matter what gender a person is, it's effort that they put into something they do. They perform a Character Transformation, Yamato Maihime, who's attack is 'Robe of Feathers, Dance of the Cherry Blossoms'. In the anime television series, Temari is voiced by Ryōka Yuzuki.

Introducing Nadeshiko Fujisaki (藤咲 なでしこ, Fujisaki Nadeshiko) / Nagihiko Fujisaki (藤咲 なぎひこ, Fujisaki Nagihiko)

Nadeshiko Fujisaki is a student in the same year as Amu and serves as Queen's Chair of the Guardians. When Amu rejected the offer to join the Guardians, Nadeshiko tries several tactics to convince Amu to join. The two become best friends and Nadeshiko looks over and supports Amu in her love life. However, before Amu and Nadeshiko enter the sixth grade, Nadeshiko leaves Seiyo Elementary to travel to Europe to study dancing.

Nadeshiko is actually a boy named Nagihiko Fujisaki, called "Nagi" as a nickname by Amu and the girls. It is tradition in the Fujisaki family for males to be raised as females as part of their training so that they may play female roles in Japanese dance. Nagihiko's secret is known by his family, Rhythm, Temari, Tadase, Kiseki, Kukai, Daichi, the school's principal Tsukasa Amakawa, Rima, and Kusukusu. Nagihiko has trouble telling Amu that he is actually a boy, instead, he told Amu that he is Nadeshiko's twin. After Kairi leaves the Guardians, Nagihiko returns and is appointed as the interim Jack's Chair. In the anime television series, Nadeshiko is voiced by Saeko Chiba. He is portrayed by Kanon Fukuda in the musical.

Introducing El (エル, Eru)

El is Utau's second Guardian Character and is the complete angelic opposite of Il. El often nags, likes correcting people about their choices that she considers wrong herself, and helps those who are troubled by love. Because El was treated badly by Il and ignored by Utau, she left home and wound up in Amu's care. El can perform a Character Transformation with Amu, resulting in Amulet Angel, which surprised Utau. However, as Amu is not El's real owner, the Character Transformation remains powerless with no real abilities. Whenever El performs a Character Transformation with Amu, Amu usually ends up being embarrassed due to El's over-the-top antics. El finally performed a Character Transformation with Utau, forming Seraphic Charm. Later in the manga series, Utau uses White Wing to help the Guardians help Ikuto. In the anime television series, El is voiced by Hyo-sei.

Introducing Il (イル, Iru)

The devilish Il is the first of Utau's two Character Guardians introduced in the story. Il seems mean and unkind, but it's just her character. Sometimes she can be helpful and sincere, but she dislikes nagging. She represents Utau's energetic and playful side. During Character Transformation, Utau becomes Lunatic Charm, with the attack Nightmare Lorelei and later, Lilin Trident. When Il felt lonely because El wasn't there for her to tease and when she felt that Utau was ignoring her because of Diamond, she Character Transforms with Amu, becoming Amulet Devil. In the anime television series, Il is voiced by Hiromi Konno.

Introducing Utau Hoshina

Utau Hoshina (ほしな 歌唄, Hoshina Utau) is a junior high student model turned singing idol. She is actually Ikuto's younger sister, Utau Tsukiyomi (月詠 歌唄, Tsukiyomi Utau^?). Utau had tried to find the Embryo to release her brother from Easter, but she never succeeded. Utau is very attracted to Ikuto and becomes extremely jealous of Amu because Ikuto shows an interest in her. However, she eventually accepts Amu and they become friends. She has become good friends with Kukai in the anime and manga.
She was the vocalist of the indie band "Black Diamond" which is produced by her manager, Yukari Sanjo, as a method of using the CDs of their music to draw the eggs out of children and make them into X Eggs. When the plan fell apart, Utau quit Easter with her manager and became a singer on her own, without Easter contracting her. In the anime television series, Utau is voiced by Nana Mizuki. She is portrayed by Misaki Yonemura in the musical.

Introducing Yoru (ヨル)

Yoru is Ikuto's cat-like Guardian Character and represents Ikuto's desire to be free. Yoru often goes out by himself and enjoys causing trouble for the Guardians and their Guardian Characters for fun. When Ikuto and Yoru undergo a Character Transformation, they become Black Lynx. Yoru is hysterical when Ikuto does the Death Rebel Character Transformation in chapter 31. Lately, he also can't track Ikuto, because the hypnotizing tuning fork confuses him. Later on, when Amu and Tadase find Ikuto being controlled by Easter, Yoru takes the Dumpty Key and gives it to Amu. In chapter 38, he along with the black egg, combine powers with Ikuto to become Seven Seas Treasure. In chapter 46, Amu finds a dazed Yoru in the Eggs' Cradle. He and Amu fall out of the Egg's cradle and see Ikuto. In chapter 48, when Yoru sees how happy Ikuto is, he comments him for having become a "true alley cat", and goes back to being a heart's egg inside of Ikuto. In the anime television series, Yoru is voiced by Miyuki Sawashiro