Fairy

Fairies will be a new life state introduced in The Sims 3: Supernatural Expansion Pack. They first appeared in the leaked trailed for the expansion.

Overview
Fairies are described as mischievous magical creatures who love playing tricks on Sims.

Appearence
Fairies wear clothes that appear to be made of leaves and female fairies have flowers in their hair. They have glowing, sparkly wings on their back, which have different variants and shapes. Some fairies have dark-greenish-blackish skin, dark colored clothes and deep blue wings, possibly meaning their are some sort of evil/dark fairies.

Magic Powers
Fairies are able to use magic, such as making a Sim's clothes vanish. They also hover/fly using their wings.

Trivia

 * There are different types of fairy wings.
 * Fairies are one of the 5 life states that will be introduced in The Sims 3: Supernatural.
 * In addition to their wings, their bodies also glow. And there are different colors of the glow as seen in the trailer.