Formal ref gonna be done sometime in the near future!
Yuki can shapechange at will, but her true form is this cutie. Her favorite shape is of a pale human woman with long dark hair and razor teeth.
She has two tear ducts to keep her big glassy eye from drying out. She's also a big whiny crybaby and prone to dynamic mood changes, bawling one minute and ecstatic the next.
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SilasPayne
Makes me think of Manako from Monster Musume no Iru Nichijou Manga, sort of anyway.