Luigi is Mario's
younger, taller, and thinner twin brother. Luigi has helped and fought
alongside his brother on many occasions. Throughout his life, he has
lived in Mario's shadow, developing both cowardly and heroic tendencies.
Mario Bros. marks his first appearance in the Mario series
and his debut in general. Originally a palette swap of Mario, Luigi was
created to facilitate a second player option. Since the two player mode
was dropped from most main Super Mario games beginning with Super Mario Land, Luigi had gained his own identity and personality.
Luigi appeared in Mario Kart: Double Dash!!. He was a medium weight character and Mario's default partner. His special item is the Green Fireball and his Kart is the Green Fire. Once again, he had a course named Luigi Circuit, and the haunted mansion where Luigi rescued Mario from King Boo, also appeared as a battle course, as well as making a cameo in the background of the Luigi Circuit course.