Tannith appears approximately 22 years old, despite having lived for over 5 centuries, and she is tall and slim, although she doesn't appear fragile. She appeared 15 years old when she was first turned, but slowly aged, over about a century, until she reached her current physical age, and stopped. She has has pale golden hair cut to her shoulders which waves slightly, inherited from her mother, and her eyes are normally dark brown and inherited from her father. She is stunningly beautiful, with silky pale skin and a slightly eerie air. As a type 2 vampire, her eyes turn crimson when in bloodthirst, and she has fangs which elongate when this happens.