Luigi is well known for looking similar to his previously stated brother, Mario, just with a greener wardrobe, more hieght, and the famous 'L' on his hat instead of an 'M' like Mario's. Not only does Luigi share visual similarities with Mario, he also shares similar attacks; such as, the fireball attack (yet Luigi's is green), and a jumping like attack for a 'b-up' attack. Luigi, like Mario, also had his own stage in SSBB called Luigi's Mansion. It was basically huge summary of Luigi's entire mansion, consisting of three floors floating on a piece of earth, each of which can be destroyed by players and rebuilt by Boos.
He appeared also in the whiteboard drawing , that Masahiro made on 2 July 2012.
He was confirmed on the dojo on 07/08/2013.
Luigi's moveset has been confirmed to be mostly the same as in Brawl. His new final smash has been confirmed to be the Poltergust 5000 instead of Negative Zone.
Pizza, Mario (older brother), Bowser (sometimes), Toad, Peach (good friend), Rosalina (love interest), Yoshi (surrogate son) Link (fellow greenie), Young Link (fellow greenie), Toon Link (fellow greenie), Classic Link (fellow greenie), Ninten (dad of Luigi's friendly rival Ness), Ness (friendly rivalry in the original Super Smash Bros.)
Bowser (sometimes), Boos, Koopa Army, King Boo (arch enemy)