User blog comment:Mnzombie/Issei's Peerage/@comment-5882552-20130202130048

My bet:

Queen - Vali

Rook - Kuroka; unnamed vampire

Bishop - Ravel; unnamed magician

Knight - unnamed dragon

Pawn - Motohama; Matsuda; Kunou

the BL is very much like the style of the author after all =)))))