User blog comment:Mnzombie/Issei's Peerage/@comment-4547267-20131218015545/@comment-9339850-20131218020224

Ophis is a dragon god, so shes a no-go, and Kuroka is a bishop so shes out. And basically anyone in Rias' peerage is out since we think that Issei doesnt want to take members from her team. And Tsubasa is kinda out from what you've already put.

So that leaves Ravel and Le Fay as logical choices, Kiyome is alright for the most part.