First arriving at Organization XIII, Yuki is an extremely shy individual rarely talking to anyone. Roxas finally was able to get her to open up by talking to her day by day. Showing her that he cared and wasn't going to harm her in any way. Roxas got her to open up around Axel and Xion which surprised Axel as she never seemed to talk around anyone but Roxas. Yuki is a very stubborn person as seen when Roxas told her to leave during a battle because she didn't have a keyblade but she proved him from when she took out her iris flower-like keyblade. She stayed, helping him fight, even willing to end her life for him, Axel, and Xion. She is also shown to be a very kind person, as when Xion had to go away she showed her more kindness then she needed.