Luigi is Mario's slightly younger and taller twin brother, a second main character in the Mario game series, and a co-star in the Mario franchise alongside Italian plumber Mario. Luigi mostly lived in Mario's shadow and developed both heroic tendencies and cowardness. But Luigi helped Mario a lot, and even fought alongside Mario on many occasions. Luigi first appeared in the Mario Bros. game as an almost exact copy of Mario, but he evolved and now even starting his own games like Luigi's Mansion, and continuing his help in the Mario & Luigi series of games. And like that, a will to create a multiplayer game created an all-new individual game character with his own series. A fanart Mario progress bar for YouTube with Luigi running.