Kuuta

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)