Iggy Koopa

Iggy Koopa is the 4th oldest Koopaling. He's bespectacled, somewhat demented, and has rainbow hair like his brother Lemmy. He's the boss of Giant Land in Super Mario Bros. 3, and he faces Mario in the first area of Super Mario World, Yoshi's Island. According to the official Super Mario World player's guide, Iggy is the youngest Koopa Kid. The artwork for Super Mario Bros. 3 portrayed Iggy with blue eyes, but later depictions (including Super Mario World and Mario & Luigi: Superstar Saga) show him with eyes that are swirls instead, possibly to indicate the thickness of his spectacles. Iggy is responsible for inventing the robots that the Koopalings use in Yoshi's Safari.

Cartoons and Movies
In the cartoons, he was called Hop Koopa (Lemmy, his brother, was named Hip, a play on hip hop). Hip's overbite is the only significant way in which he differs from Iggy. Like Hip, Hop was also voiced by Tara Strong.

In the Super Mario Bros. movie, one of King Koopa's cousins is named Iggy.

Trivia

 * Iggy is named after legendary punk pioneer and rock star Iggy Pop.