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Clefairy is a bipedal, pink Pokémon with a chubby, vaguely star-shaped body. Its mouth has a small, pointed tooth protruding from the upper left corner. It has a wrinkle on either side of its black, oval eyes, dark pink, oval markings on its cheeks, and large, pointed ears with brown tips. A tuft of fur on its forehead curls down over its face, and its longer tail is also tightly curled. There are small wings on its back, which are incapable of flight. However, it can store moonlight in them, which allows them to float. Its stocky arms have three digits on each hand, two these digits appear to have short claws. Each of its feet has a single clawed toe.
Clefairy is very shy and rarely shows itself to humans. On the rare occasions it does come down from its mountain home, it can be seen dancing in the moonlight. Once the sun starts to rise, it returns home where it sleeps nestled with others of its kind. The anime has shown that Clefairy is actually an extraterrestrial Pokémon.