I apologize...

Guinea pig!Au for Metal.

Bruce Dickinson (same expression, dude!)

Rob Halford (blond, sunglasses and jewels!)

The Manowar Guinea Pig, ready for the battle.

Ronnie James Dio (ah! those curls!!)

Scandinavian Metal Guinea Pig. Could be Alexi Laiho =P 

And last, but not least…

DAVE MUSTAINE!!! (It’s CLEARLY Dave Mustaine, look at him!!!)