Rob Halford comes out for Rapid Fire (which they did as the grand finale on the very last days of the black album tour)
King Diamond (though please play the Mercyful Fate songs in full, just this once).
and here's a darkhorse ensemble
Paul Di'anno for Remember Tommorrow and Prowler.
I listened to three Babymetal tracks...sounds like Chun Li getting butt-fucked by Andrew W.K. That's not something I ever wanted to hear.