User blog comment:B214/Volume 23 discussion blog/@comment-1884090-20170802143233/@comment-60.48.182.3-20170802160310

IMO, I think Issei's peerage is the one that needs the most development rather than the others that you mention. Because Rias peerage I would say i damn OP (Vasco and Crom Cruach) like wtf, Vali's Team (Arthur Pendragon, Fenrir, Bikou and Gomaggog(Idk how to spell) again OP), Sairaorg and Cao Cao's peerage are given in High School DxD Dx 4 and Sona's Peerage are as we know. But if you're talking about their peerage(team) not the peerage for Azazel Cup then that's a different story.