Utau's first Guardian Character that is seen is the conflict-loving, devilish girl, Il. She dislikes peace and becomes very bored if the current situation is peaceful. She tells El at one point that a Guardian Character that doesn't even Character Transforms is not needed. Soon after, El left Utau, and ll actually became so bored that she wanted El to return so she can tease her. She also tends to be very rude to others, in particular to Yukari Sanjo. This was shown when she called her a old woman when she's actually in her 20s. Her and El's names are usually pronounced "Iru" and "Eru". The name "Il" is also the last two letters of the word devIL.  During Character Change with Il, a pair of bat wings sprout from Utau's back, making the melody that she sings pull out X Eggs. However, the amount of X-Eggs she can pull out is not large and the owners of these eggs have to hear her sing live.  She can also use this Character Change to fly and send out a powerful wave of butterflies to attack.  When Utau transforms with Il, she becomes the devil character Lunatic Charm. This represents the rougher, more cunning aspect of her. This transformation first appears in Episode 22 of the anime. 

Amu Hinamori is a 5th grade transfer student who is fashionably cool, tough and independent. Despite this, she is also a girl who seems unapproachable, both at home and at school. In reality, the "Cool and Spicy" role she plays is just a facade that she unconsciously plays. With her guardian characters, she fights the Easter Company who is extracting people's eggs to create X Eggs & X Characters in search of a special egg called the Embryo.
 
(Source: Crunchyroll)

[Profile](https://www.aoni.co.jp/search/konno-hiromi.html)

Hiromi Konno is a Japanese voice actress and narrator from Hokkaido. She graduated from Faculty of Economics at Sapporo University. After leaving Marcus and Aoni-juku she is now affiliated with Aoni Production. 

Everybody at Seiyo Elementary thinks that stylish and super cool Amu has it all: But nobody knows the real Amu, a shy girl who wishes she had the courage to truly be herself. Changing Amu&rsquo;s life is going to take more than wishes and dreams&ndash;it&rsquo;s going to take a little magic! One morning, Amu finds a surprise in her bed: three strange little eggs. Each egg contains a Guardian Character, an angel-like being who can give her the power to be someone new. With the help of her Guardian Characters, Amu is about to discover that her true self is even more amazing than she ever dreamed. 
(Source: Del Rey) 
Note: Includes 3 side stories.

With things having quieted down a bit for the Guardians, they can now focus on things besides fending off the peril of the evil Easter Corporation. Amu is having some troubles deciding which guy she likes the most, and hiding Ikuto in her room. Not only does the Embryo still elude the Guardians, and worries of Easter being suspiciously inactive, the threat of a new X Egg appears...

Amu meets a super-peppy transfer student at Seiyo Academy Elementary School named Hiiragi Rikka at school one day. Not only can she see Guardian Characters, but it seems she has some other, mysterious powers as well. When she sees the work that Amu and the other Guardians do at school, she's awestruck. 
Each 24-25 minute episode consists of a series of variety show style shorts (including Shugo Chara! Pucchi Puchi) totaling approx. 9-10 minutes, followed by the main 11-12 minute animation titled Shugo Chara!!! Dokki Doki which is the actual continuation of season 2 and comes with it's own opening animation. The remaining time is occupied by live action padding between each section and capped off with the opening/ending themes at the beginning and end of the episode. 
(Source: AniDB)

Amu's beloved Guardians Characters finally nab the spotlight in this new Shugo Chara series! Ran, Miki, and Su explore holidays, exercise, bears, cooking, painting, and more character changes than you can count in these hilarious and lighthearted short stories, told in 4-koma (4-panel) comic-strip format.
 (Source: Kodansha USA)