Leprechaun

Leprechauns are small humanoid mobs that spawn in forests or extreme hills.

Appearance
Leprechauns resemble Steve, but wear green clothes and a green hat and are 1.3 blocks tall. They run as fast as baby zombies, making them very hard to catch.

Behavior
Leprechauns act like any other mob in the game and even walk at the same speed, until approached. Then it will run in circles to disorient the player at very fast speeds and will do its best to get away. If caught up with and not killed, they can trade with you at unfair expenses. They can be found in forests, roofed forests, snowless taigas, flower forests, or extreme hills biomes. Unfortunately, they have a 3% chance of spawning, but could be spawned with a spawn egg.(Not yet added to pocket edition)

Leprechaun villages
Leprechaun villages can be found, but very rarely. The houses appear to be small huts made of birch planks and leaves. Leprechauns reside in them and act like any villager including the ability to trade. These villages have a 8% chance of being found.

Drops
When killed it will drop 3-9 diamonds, 2-4 gold ingots, or 1-3 emeralds.