Leprechaun

Leprechaun is a very small green leprechaun. He has shaggy eyebrows and a beard and is dressed all in green with a coatee (short jacket) and waistcoat, a bowler hat or canvas sailor's hat with a shamrock in the hatband, short pants and light- and dark-green-banded stockings, and dark green shoes with gold buckles. He always carries a white clay pipe in his teeth to complete the stereotype.

History
He is seen as Ralph's imaginary friend who told him to burn things.

He is also seen during Gil, Kirk Van Houten, and the Crazy Cat Lady's St. Patrick's Day Song.

He was also seen in a parade, he once attacked Homer & Bart, and he once fought against his orange (Northern Irish) doppelgänger.

The leprechaun is also part of the bowling team Are They Reals.

Marriage
The Leprechaun married the Gypsy. Yoda performed the ceremony.

Simpsons Comics
In the comic story Ralph the Role Model, the Leprechaun disguises himself as a younger kid who wants Ralph to be his role model. But his plan was actually to get Ralph into trouble. However, all of his attempts fail.