Kazuomi Hoshina formerly Kazuomi Ichinomiya, is the managing director of Easter company, a middle-aged man who is also the stepfather of Ikuto Tsukiyomi and Utau Hoshina, and the former superior of Nikaidou and Yukari. After his repeated failure to obtain the Embryo, he started fearing that Gozen may abandon him, so he forms a plan to brainwash Ikuto to collect X-Eggs.    ~!Kazuomi was jealous of Alto Tsukiyomi and thought of him as not suited for working as the head of Easter. He saw his grandson, Hikaru as suitable. Kazuomi saw competition in Ikuto, but he decided to use him as a puppet instead to lure the Embryo. After Alto disappeared, he forced Souko Hoshina to marry him, not even concerned for his grandson.   In Chapter 33 of the manga, he realizes that the Embryo only shows up when X-Eggs are purified, so he lures the Guardians into a trap. Ikuto refers to him as "Mr. Director". As the chapters go on, he is seen as abusive to Ikuto and ruthless. He brainwashes Ikuto, forcing him to comply and putting him into a Character Transformation with a black egg. !~ (Source: Shugo Chara! Wikia) 

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)

Mitsuru Ogata is a Japanese voice actor. He is affiliated with Mausu Promotion

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...