Irish Squats with incredible powers and at least three livers1). Beating them up is quite profitable 2)3), but they tend to come in packs and aren't above biting a fellow in his frick and frack.
Leprechaun can also refer to Squats who are also Jokers. This sort of leprechaun is highly dangerous even by themselves. Approach with caution 4). One known leprechaun of this type is Akogi who can only be spotted during certain phases of the moon and looking just in the right direction.