Chuck Norris. He's pretty metal. I don't know if i can help ya. You could just totally name it like... Lamb of God 666 That's pretty metal.
Cradle of Filth. Um. What exactly are you looking for? An alter-ego (life, interests, etc)? or just a s/n?
My love for you is like a truck, Berserker Would you like some making fuck, Berserker My love for you is like a rock, Berserker
Ahaha... I remember watching this comedian talk about 80s metal videos and how the bands could actually change the physical state or being of things.