Luigi

Character Basics
Luigi is the older brother of Mario. Like Mario he was born in Brooklyn, is a former plumber and now resides in the Mushroom Kingdom. Luigi is taller than Mario and is more cowardly, however Luigi has done things Mario could only dream of accomplishing. According to the Super Mario World TV Show, Luigi is the one who brought Yoshi to the Mushroom Kingdom and is his adoptive father (seriously).

In Smash
Luigi was an unlockable character in the original game, in each game his unlock requirements had become easier to fulfil until Smash 4 where he was now a starting character. although not as good as Mario, Luigi has seen regular Smash 4 competitive usage and is considered a viable character.

In Super Smash: Bloxxed
Luigi is a quirky character, so his attacks are very unpredictable, he plays a lot like his Smash counterpart but his Down Special is different and some moves have been altered.