Demons

Demons (悪魔, Akuma), are a species in the J-Stars's Fairy One Piece Tail series created by Hiro Mashima and Eiichiro Oda. They are a race of magical beings who dwell in the world.

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 * —About Demons.

Description
The appearance and abilities of Demons vary, although there are a number of common traits which many of them share. Such traits may include horns, pointed ears, claws, tails and leathery wings.

There is a subspecies of Demon, known as the Etherious, which is comprised of Demons born from the Books of Zeref.

Powers and Abilities
Demons have a number of Magic and abilities, though it varies from Demon to Demon. The subspecies known as Etherious prefer to use Curses, rather than Magic.

Magic and Abilities

 * Transformation Magic (変身魔法, Henshin Mahō): The Demons living on Galuna Island possess this Magic and use it to transform into humans.
 * Flight: Many winged Demons have been shown to possess the ability to fly with their wings.