Character Profile: Luigi
Background
As the original "Player 2," Luigi was created to be identical to Mario in the arcade game Mario Bros. From then on, he appeared in nearly every game alongside his brother, exhibiting an extremely similar skill set. An early attempt to differentiate him appeared in Super Mario Bros.: The Lost Levels which gave him a higher jump and reduced traction.
His personality slowly began to develop over the various RPGs, resulting in a cowardly, comical character to serve as an antithesis to Mario's brave heroics. This netted Luigi his own series of games with the Luigi's Mansion series in which he is forced to investigate haunted houses to save his brother. Luigi's humorous qualities were further explored in the Mario & Luigi series, which turned him into a clownish buffoon whom nobody recognizes, and Super Paper Mario which gave a brainwashed Luigi a villainous turn as "Mr. L."
Because Mario is the Nintendo poster child, very little can be done with his persona in terms of character development. Luigi is where creators can have fun, as seen throughout the Super Smash Bros. games. His moves are based on awkwardness, creating a much different playing style than Mario. 2013 has been dubbed "The Year of Luigi," with games such as New Super Luigi
Special Moves
B - Green Fireball
Origin: Mario Bros. (1983)
I'm basically keeping all of Luigi's special moves the same because they work well for his character. The green equivalent of Mario's Fireball once again flies straight ahead instead of bouncing, just as it did in the original Mario Bros.
Up B - Super Jump Punch
Origin: Super Mario Bros. (1985)
Luigi's version of the Super Jump Punch doesn't repeatedly hit the opponent like Mario's, but if begun at a close enough range, it can send out a fiery upward spike into the air at greater damage.
Side B - Green Missile
Origin: Super Smash Bros. Melee (2001)
For some reason, Luigi was given this special "blast-off" move that never existed in any other game. Technically, it works as away to counteract his Super Jump Punch's lack of horizontal distance. Plus, I like the fact that it can "misfire" and send him careening across the screen. Poor Luigi.
Down B - Luigi Cyclone
Origin: Super Mario World (1990)
Final Smash - Negative Zone
Origin: Super Smash Bros. Brawl (2008)
Inspired by the idea of "living in Mario's shadow," Luigi performs a strange tribal dance that unleashes his darker side and ends up confusing those caught in his negative sphere. It's so odd and quirky that I couldn't bear to take it away from him.
Alternate Costume
Mr. L
Origin: Super Paper Mario (2007)
Luigi's alter-ego is only really known for his Super Jump power and his mechanical abilities. Since building giant robots is out of the question, all that this costume would really alter is the Super Jump Punch, replacing a fiery effect for a more electrical/dark aura.