Guess Who?

IMG_5127, a photo by Wily Jeneric on Flickr.

Any guesses what Wily is pretending to be?

Hint 1: They were the class topic for a week at school.

Hint 2: Apparently they have green teeth.

Hint 3: Under no circumstances have I been able to convince either Wily or Jeneric that I can pretend to be one.