Mephistophiliac
Pfukkuntaschitz
But... but... you've just uploaded one.
As for a metal one, I'd go for Doro over Christina, even though I'm a Christina fanboy (not her music though ). Doro is one of the first women in metal, and still going at it. I'd choose her if I were you.
That was my first thought as well for the Madonna.
Edit: You should include a choir of angels: Vortex, Warrel, Barlow, etc.
Also, an combination of Dio and Lemmy should be God.