Sigewinne is a Melusine with a human-like complexion and hands. She has pink eyes, tall blue ears with frosted tips, a curled tail, and pastel blue hair fading to purple with white highlights, tied in pigtails with white pom-poms. She wears a nurse's cap adorned with small gold trinkets. Her outfit includes a turquoise undercoat with a large pink bow and golden fastener, white gloves, and a white apron with gold clips, a heart-shaped pocket, and pink and blue bowties. She has black shorts.