Leprechaun

A Leprechaun is a small irish Fairy dressed in green. It absolutely loves Gold, so placing a Gold Bar or a coin near it will cause it to stop whatever it is doing, and simply guard the trinket, and will also attack anyone that's holding gold. This comes in handy, since a certain puzzle requires you to race him to a Starite, and he, being magic, will simply dematerialize whatever you put in his path. It's also interested in Rainbows.