I'm not sure if the Lucky Charms leprechaun could win a fight against Zeus, but as leprechauns are the physical embodiment of good luck, it should at least keep him from dying.
My money's on Zeus. He'll just create an army of children to steal Lucky's Lucky Charms. I mean, look at all the kids he cranked out in Greek mythology.
i wuld say lucky the lepercon because i think he is always lucky he much more power just think of the thing of having a vision and lucky still standing