This is Luigi, on New Super Mario Bros DS. You may be wondering: What??? Luigi is not a playable character on New Super Mario Bros DS! This image is Fake! Well, it's not, it's a real image.
I'll teach you how to get Luigi, Step by Step.
1st Step: Turn on your Nintendo DS or DS Lite or DSi or DSi XL or 3DS or 3DS XL or 2DS.
2nd Step: Insert the New Super Mario Bros DS Cartridge, If it's inserted, ignore this step.
3rd Step: Play the New Super Mario Bros DS Game
4th step: Go to "Mario Game"
5th step: Choose any file you want, Before you select it Hold L+R and select the file. You will hear Luigi say "Luigi!"
Now you're playing with Luigi!
Enjoy!