Yuki is on the more tomboy side than any other vampire girls until she is kissed by a Man. This is because in her Vampire Ninja culture, when a Man kisses a female vampire ninja then it's consider a proposal She's shy, caring, and honest to herself and went the best thing for the Man who kisses her. She tries to be the best housewife as much as possible in order to get the approval of the Man who kisses. Upon being kissed by a Man, she starts to act more soft and attentive to him.