who is this guy?

It's an elf, you racist ;)
More infos here

It's an elf I guess

I hope it's not frowned upon to share the truth, 'cause it awesome.

It's a photoshopped still from The Dark Knight. The person in this picture is Heath Ledger as The Joker, but without any makeup (yes, he appears once in the movie without his signature makeup).

I frown at your presence on this site without knowing that face.

ELF!!!!!!

Avatar! ;D

Jesus

You are being very disrespectful by asking.

The smurfest smurf in smurfette ville.

omg he shaved off his mustache

Elfzz!

Pointy ear'd bastards, stealin' our jobs and our money.. They should just climb back up their precious trees and stay there.