GameFAQs Super Smash Bros. Board Wiki

Green Mario
Species Human
Homeworld The Kingdom Mushroom
Series Luigi
Affiliation Not Luigi
Gender Male

Green Mario is not Mario nor Luigi. It is an entirely original character from somewhere.

What Does He Do? 

He has the same abilities as Luigi, but is not Luigi due to varying stats such as weight, power, speed and such. And instead of his talent being sucking up ghosts, it's the opposite: spitting out ghosts.

How Is He Not Luigi? 

His name does NOT have Luigi in it and he is different from Luigi, duh...

How to tell the difference

Is He Mario? 

No, he is not Mario. Even though his name has Mario in it, he is not Mario since he shares no similarities to Mario besides part of his name, and the M on his hat.