Leprechauns are quick, and will jump around similar to human-form Vampires. They will jump on the player stunning them like a monkey does. Upon doing this the player will drop a several coins which the leprechaun will try and pick up before teleporting away.
Upon being killed, they will drop a Four-leaf Clover and a rainbow may spawn somewhere in the level. Upon uncovering the tile the rainbow is on, a pot of gold can be found, which can be destroyed for $20,000. Note that the bottom of the rainbow marks the pot, rather than under the arch of it. This pot of gold can exist without the clover, and can be found through sheer luck without using the rainbow to find it.