Dullahan

The trail of a Dullahan isn't just for show. Because it is difficult for her to expression emotions through facial features, her body displays it by changing the color of its smoke to match her current feelings.
 * Dark grey - Apathy
 * Black - Malice
 * Crimson - Anger
 * Red - Passion
 * Pink - Infatuation
 * Orange - Anxiety
 * Gold - Delight
 * Green - Envy
 * Blue - Calm
 * Indigo - Depression
 * Violet - Bewilderment
 * White - Happy (Extremely rare. Some believe it to be a hoax.)