Tailed Beast

In the Naruto universe there are at least nine "great" demons,called the tailed beasts. The Nine tailed fox demon is sealed inside Naruto. Gaara of the desert used to have the one tailed demon sealed in himself

One Tailed demon
Host: Gaara (former)

Appearance: Resembles a raccoon dog that is made of sand

Abilities: controls sand. Spits Wind full of chakra

Two tailed demon
Host: Unknown

Appearance: Cat with two tails made of fire

Abilities: Controls Fire

Nine Tailed Fox Demon
Host: Naruto

Appearance: A red fox with nine tails

Abilities: Nearly unlimited chakra