Guardian Chara
The manifestation of the character one wants to become. Called "Shugo Chara" but "Shugo" translates well to "Guardian".
Amu's Guardian Chara
Their names came from the Japanese idol group Candies.

From left to right: Miki, Ran, SuuRan (ラン, Ran?)
Voiced by: Kana Asumi

The first to come out from Amu's Eggs. An athletic and honest character. Her hair is tied in a side tail. She has a pink sun visor and a red themed cheerleader costume on, she wears a heart shaped hair clip. Dislikes silence.
During Chara Change, Amu gains increased athletic abilities. Little wings appear at her wrists and ankles, with that she can jump high and fly. Having a straight forward personality, Ran made Amu confess her crush to Tadase on their first Chara Change.

Amu becomes "Amulet Heart" on Chara Become with Ran. The clover decoration of her Humpty Lock changes to pink color. Amu dons a pink themed cheerleader costume in this form. Her special move is "Spiral Heart" which is executed with the Heart Rod. When Amu does Chara Change with Ran, Ran says "Hop, Step, Jump". Ran was seen on Peach-Pit's website before the publication of Shugo Chara! Volume 1.

Miki (ミキ, Miki?)
Voiced by: Nanae Katō
A guardian chara with an artistic flair. A cool, quiet character. Her hairstyle is a short bob cut. She usually wears a pair of half-cut pants and a sky blue newsboy cap and blue themed costume. Theres a spade decoration on the cap. Poor in restraining herself. Miki has also shown an interest in both Tadase's Chara Kiseki and Ikuto's chara Yoru. She comments Yoru is cool and his tail is cute. This may imply the situation in Amu's heart.
The main ability after Chara Change is an increased artistic sense but that power is recklessly abused.

Amu becomes "Amulet Spade" on Chara Become with Miki. The clover decoration of her Humpty Lock changes to blue color. Amu wears a white frilly blouse with a pair of hot pants, she also wears long, striped stockings and a garter belt; all in a blue themed costume. Her special move is "Colorful Canvas", where she paints with a giant paintbrush. Miki says "Drew, Draw, Drawn" during a Chara Change with Amu.
Su(スゥ, Suu?)
Voiced by: Aki Toyosaki
A guardian chara skilled in baking sweets and doing house work. A "my pace" character that is prone to silly mistakes. She has short hair with the sides grown long, curling inwards. She wears a scarf on her head with a clover shaped hair clip and dons a green theme maid costume. Dislikes caterpillars.
Amu gains an improvement in cooking during Chara Change. Magical abilities like summoning large amounts of whip cream is also observed. In addition her speech and behaviour becomes more lady-like.

Amu becomes "Amulet Clover" on Chara Become with Su. The clover decoration of her Humpty Lock changes to green color. She wears a green themed balloon skirt maid costume. Her special skill is "Remake Honey", a restoration type skill. Su says "Chip, Syrup, Whip" during a Chara Change with Amu.
Ran's, Miki's and Su's Chara Become all share another special skill, "Open Heart!". A skill that cleanse X Eggs and X Chara.
Guardian's Guardian Chara

KisekiKiseki (キセキ, Kiseki?)
Voiced by: Kaya Miyake
Kiseki is Tadase's Guardian Chara. He looks like a mini Tadase with different-colored hair. He is extremely egotistical, loves to dominate but also has tsundere characteristics. He is always trying to outshine Yoru. His bearing is that of typical "king's fashion", complete with crown and mantle. Kiseki also occasionally calls meetings that require all the Guardian Charas to gather. In volume one, Miki seems to have a crush on him,saying he is cool. Likes to give orders but does not like to obey. Suffers from pollen allergy like Tadase.
Kiseki can do Chara Change with Tadase. When this happens, Tadase gains a golden crown and king’s scepter. The only reason he usually character changes is to help Tadase become confident and if Tadase is called ‘prince’.
After the "Black Diamonds" incident, he became able to Chara Become with Tadase. Tadase becomes "Platina Royale" on Chara Become and used the special skill "White Decoration", a skill thought to be a restoration skill.

TemariTemari (てまり, Temari?)
Voiced by: Ryōka Yuzuki
Temari is Nadeshiko's seemingly elegant Chara. She is considered to be very girly and is always complaining about getting her kimono dirty, which always ends up annoying Daichi. Her hair tied in a ponytail with hair decoration in the shape of sakura flowers. She is skilled in handling the naginata and dislikes getting muddy.
Temari has the ability to perform Chara Change with Nadeshiko. Nadeshiko then becomes battle hungry, often over little things like getting hit with a ball. Temari herself seems to have an anger problem. Says "ching, pan, shang" during Chara Change.

PepePepe (ぺぺ, Pepe?)
Voiced by: Kimiko Koyama
Pepe is a baby-like Guardian Chara that belongs to Yaya. She always has a pacifier in her mouth, wears a full body baby outfit, and wears her hair in pigtails. When either she or Yaya get hurt or something goes wrong, both of them will begin to whine and cry in unison. Pepe could be described as a crybaby.
When she and Yaya perform Chara Change, Yaya receives a baby bib and a giant rattle that she uses to squash or hit opponents with. Says "pretty, cutey, love baby" during Chara Change.

DaichiDaichi (ダイチ, Daichi?)
Voiced by: Hiroyuki Yoshino
Kukai’s Guardian Character is Daichi. Daichi is very good at sports and can't seem to sit still. He was born when Kukai want to do many sports but had to choose. He wears a sweatband around his head, shorts, and a sporty T-shirt. When Daichi and Kukai do Character Change, Kukai becomes even more athletic and gains a star clip for his hair that looks like the same star on Daichi’s head band. Daichi was able to do Chara Become with Kukai once, resulting in "Sky Jack".
Easter's Guardian Chara

YoruYoru (ヨル, Yoru?)
Voiced by: Miyuki Sawashiro
Ikuto's Guardian Chara, Yoru, has cat-like features. He wears a pair of paw gloves and boots and dresses in punk fashion style. Yoru has a freedom loving stray cat image and often wanders around wherever he pleases without staying with Ikuto. Yoru loves to tease and annoy Kiseki, who in turn tries to do things only Yoru can do, like climb on buildings and railings. He also seems to be Scared of dogs.
When Yoru and Ikuto perform Chara Change, Ikuto grows cat ears and a tail. In Chara Become, Ikuto wears a spend-like outfit, has cat ears and a tail, and uses a glove with metal claws. In volume two, Miki seems to like Yoru as well as Kiseki. She, though, has more complements showing she has more of a crush on Yoru than Kiseki.
Iru (イル, Iru?)
Iru is Utau's first Guardian Chara. She has short, dark hair and devil wings, tail, and horns. She wears a two piece skirt and top that seem to come on as if they were bats. Mean, unkind and dislikes nagging. When she and Utau perform Chara Become, Utau sprouts bat wings and many wing shaped accessories. Her special move in "Lunatic Charm" form is "Nightmare Lorelei".
Eru (エル, Eru?)
Eru is Utau’s second Guardian Chara. Has an angel appearance. She does not want to do Chara Become with Utau (her Chara Become with Amu is her first). Eru is gentle hearted and seemed to be treated badly. Eru left home and is now in the care of Amu. She uses english words like "wait" and "shut up" in her speech. Likes to nag, dislikes meaness and unkindness.
Eru performed Becoming Character with Amu once, resulting in "Amulet Angel", which surprised Utau. The clover decoration of her Humpty Lock changes to white colour. Her special move is "White Flag". As Amu is not the real owner as the Chara Become quickly dissolves after it forms.