Mertle and mocks Lilo with her. They usually travel in a group and seldom say anything other than a sarcastic "Yeah!" in unison when agreeing with Mertle on something. It is often hinted that they would actually like Lilo if Mertle didn't make them think they didn't and have actually sided with Lilo a few times. And as such, she once referred to them as her friends soon after she adopted Stitch. Yuki's bellybutton is sometimes shown from her pajama shirt.
Yuki has short, brown hair and is of Japanese origin.