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Pat O'Wiley is an Irish leprechaun.
The Richie Rich/Scooby-Doo Show
When he was caught by one of Scrappy-Doo's traps he promised to lead him, Shaggy Rogers, and Scooby-Doo to a pot of gold, but he did nothing but play tricks on them instead. (Scooby's Luck Of The Irish)