Kuuta is the Guardian Character of Shouta, who appeared in episode 34.   ~!He was born from Shouta's dreams to become a painter. However, as tragedies occured in Shouta's family, his dreams began to fade away along with Kuuta. A half-year after Shouta moved away with his parents, Kuuta remained in the manor and began wreaking havoc to make people notice. As the rumors finally reach to the Guardians, they decide to take a look at Shouta's old house and investigate. At the same time, Shouta returns to visit his old house, but his depression turns Kuuta into an X-Character. As an X-Character, he can attack with a paintbrush using an attack called "Dark Canvas". When he uses it, he releases painting substance from his paintbrush. Because Kuuta is an artistic character, his powers are quite similar to Miki's.  After Amulet Spade purifies him, he returns to his master, with his hopes and dreams revived.!~ (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.
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(Source: Crunchyroll) 