Northern Irish leprechaun
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He is first seen leading the Protestant St. Patrick's Day Parade (in which the marchers wear orange clothing) in opposition to the Catholic St. Patrick's Day Parade (who wear green clothing). When Bart asked Lisa what they are fighting over, she sighed and responded "It always comes down to trans-substantiation versus con-substantiation."
Lisa tried to calm the mobs with an Irish lullaby, which moved them to hugging and crying. However, the Northern Irish Leprechaun soon started viciously battling it out with his Catholic counterpart after the Catholic Leprechaun sucker-punched him. During the ensuing melee, Marge commented, "This was such a pleasant St. Patrick's Day until all the Irish people showed up!"