This is Seelie.
She likes to play tricks on wanderers, who pass through her part of the forest. But sometimes she also helps people in danger and rescues them. On nights of the full moon, she dances in fairy rings on meadows in the forest (clothed, of course; she doesn't want to catch a cold).
This is Unseelie.
She is the polar opposite of Seelie, and the tricks she plays are far more dangerous, sometimes resulting in the death of the victims. She often appears shortly before a disaster happens. On nights of the new moon, she dances in fairy rings on meadows in the forest (naked, if she feels like it).
Created both while listening to CLANN.