User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.243-20160806162232/@comment-95.90.227.243-20160806171209

or it is another Lucifer ! That would be awsome Valis Cousin or sister :D or another Levithan or Beelzebub or nah the other would be not as awesome as these three :D Maybe One of them has an Interest in Issei because he  change the Supernatrual World :D Everyone has there Eyes on him, you could say he is the Face of the Supernatrual World :D And when he is the leader of ExE he could become sort of Prime minister of the Supernatrual World or so :D

Also maybe Issei Parents will chose to join a Peerage maybe Lady Gremory or Phenex ? :D