Fairy

Fairies are a new playable life state that will be introduced in The Sims 3: Supernatural. They first appeared in the official announcement trailed for the expansion. Before they were officially announced, there was a patch (1.32) which accidentally had visual effects files from the Supernatural expansion pack. Some of the effects were that of fairy wings.

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 pointed ears and 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 they are some sort of evil/dark fairies.

Magical Powers
Fairies are able to use magic, such as making a Sim's clothes vanish. They also hover/fly using their wings, as seen in the trailer. Like vampires, fairies will have an extended lifespan. They can shrink to their "natural form" to perform tasks that they cannot do normal sized.

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.
 * Players will be able to pick 'Fairy' as a life state when they are creating their sim in Create-A-Sim. They will also be able to pick the wing shape and color.
 * Fairies are rumored to be able to shrink.

Reference
Fée