Leprechaun

The leprechaun is a small redhaired man with a large beard. They wear green clothing and usually live alone. They are known for hiding pots of gold at the end of rainbows. If caught, they will usually grant wishes in return for their freedom.

Source
The leprechaun originates from Irish Folklore.

Media
Leprechauns appear in the following media:

Movies

 * Leprechaun - an american horror-slasher comedy movie from 1993, starring Warwick Davis (as the Leprechaun) and a young Jennifer Aniston in her film debut. It was followed by five sequels.

Games

 * Crypt of the NecroDancer