Who is Luigi?
Luigi (full name, Luigi Mario) is Mario's younger twin brother.
If you've played SSBB (Super Smash Bros. Brawl), you'll know who he is. He's mostly seen sporting a green L hat, white gloves, blue overalls, and a green long sleeved shirt. He's actually a coward since he's TERRIBLY FRIGHTENED OF BOOS. He's madly in love with Princess Daisy, and some people believe he is engaged to her.
Luigi usually wears green and has a better jumping ability however, his traction is lesser. In Super Paper Mario he was both an antagonist and protagonist. He was known as "Mr. L." Luigi is sometimes treated as lesser and is known to be timid and cowardly.