Mifuyu Torii

Mifuyu Torii is an anime-only character who appears in episode 14 and 15. She is a snowboarder and handles the techniques very well, but whenever someone show expectations from her, she becomes nervous and would run for the hills. When some comtestants in a snowboarding practice tell her that they are expecting her to do her best in the skating competition, she becomes so nervous that she skates away from everyone. Just then, Amu's Guardian Characters sense the presence of her Heart's Egg and go after her, and when they arrive her egg appears and hatches. In order to help her understand what a Guardian Character is, Amu explains to her and introduces her Guardian Characters.

Because her strong heart made a strong Guardian Character, Yuu Nikaidou chooses her Guardian Character to be his target of making an Embryo. By making her insecure again, she loses her confidence and Snoppe becomes an X-Character. However, Amu is able to save Snoppe and helps Mifuyu in the competition, where she wins the first prize. (Source: Shugo Chara! Wikia)