Yuki was the first victim to have her heart's egg hatched into an X-Character in Shugo Chara!. Her egg was "hardened" due to her worrying about moving to America and having to face changes at which point Nikaidou transformed it into a X-Egg. In the end, she did not move.
Yuki has short dark green hair that has a yellow pin on it and has blue eyes.
Yuki's Guardian Character is dressed in an air hostess' outfit. She is also very good with English.
- The girl from Episode 40 shares Yuki's name.