User blog comment:B214/Volume 23 discussion blog/@comment-76.175.162.45-20170402015028/@comment-31137559-20170402041426


 * Ophis can't be reincarnate because she's a dragon god and the embodiment of infinity and is way too powerful for any evil piece. Think about it like this. Ophis is the Dragon God of Infinity. So it would take an infinite number of pieces to reincarnate her into a devil.


 * The evil pieces you are reincarnated with are tied to you forever. They can't change into another piece. And different evil pieces can't merge. And plus Kuroka has no interest in being in someone's peerage. Her personality doesn't allow it.


 * Issei wants an all-female peerage. So no males allowed. And plus Ouryuu is the heir to the Nakiri clan and most likely has no interest in becoming a devil. And Vali wouldn't want to serve under his rival. And Vali is already a devil and the evil pieces are used to reincarnate other species into devils(although you can use them on those that were born devils). The number of evil pieces depend on the strength or potential strength of the person(of another species besides devil) being reincarnated.