User blog comment:Mnzombie/Issei's Peerage/@comment-24438220-20140118213224/@comment-1359322-20140125010835

Sirzechs' Rook is a clone of a Fire Giant from Norse, Surtr.

And the Evil Piece could probably be used on all species except Gods and Buddhas. Their existence are the exact opposite of Devils after all. Devils and Satans are things most human view as evil and hate while Gods and Buddhas are something human pray to, revered and respect.